Merge branch 'pm-domains' into for-linus

* pm-domains: (33 commits)
  ARM / shmobile: Return -EBUSY from A4LC power off if A3RV is active
  PM / Domains: Take .power_off() error code into account
  ARM / shmobile: Use genpd_queue_power_off_work()
  ARM / shmobile: Use pm_genpd_poweroff_unused()
  PM / Domains: Introduce function to power off all unused PM domains
  PM / Domains: Queue up power off work only if it is not pending
  PM / Domains: Improve handling of wakeup devices during system suspend
  PM / Domains: Do not restore all devices on power off error
  PM / Domains: Allow callbacks to execute all runtime PM helpers
  PM / Domains: Do not execute device callbacks under locks
  PM / Domains: Make failing pm_genpd_prepare() clean up properly
  PM / Domains: Set device state to "active" during system resume
  ARM: mach-shmobile: sh7372 A3RV requires A4LC
  PM / Domains: Export pm_genpd_poweron() in header
  ARM: mach-shmobile: sh7372 late pm domain off
  ARM: mach-shmobile: Runtime PM late init callback
  ARM: mach-shmobile: sh7372 D4 support
  ARM: mach-shmobile: sh7372 A4MP support
  ARM: mach-shmobile: sh7372: make sure that fsi is peripheral of spu2
  ARM: mach-shmobile: sh7372 A3SG support
  ...

Documentation/power/devices.txt

@@ -506,8 +506,8 @@ routines.  Nevertheless, different callback pointers are used in case there is a
 situation where it actually matters.
 
 
-Device Power Domains
---------------------
+Device Power Management Domains
+-------------------------------
 Sometimes devices share reference clocks or other power resources.  In those
 cases it generally is not possible to put devices into low-power states
 individually.  Instead, a set of devices sharing a power resource can be put
@@ -516,8 +516,8 @@ power resource.  Of course, they also need to be put into the full-power state
 together, by turning the shared power resource on.  A set of devices with this
 property is often referred to as a power domain.
 
-Support for power domains is provided through the pwr_domain field of struct
-device.  This field is a pointer to an object of type struct dev_power_domain,
+Support for power domains is provided through the pm_domain field of struct
+device.  This field is a pointer to an object of type struct dev_pm_domain,
 defined in include/linux/pm.h, providing a set of power management callbacks
 analogous to the subsystem-level and device driver callbacks that are executed
 for the given device during all power transitions, instead of the respective

Documentation/power/runtime_pm.txt

@@ -606,32 +606,60 @@ driver/base/power/generic_ops.c:
       callback provided by its driver and return its result, or return 0 if not
       defined
 
+  int pm_generic_suspend_noirq(struct device *dev);
+    - if pm_runtime_suspended(dev) returns "false", invoke the ->suspend_noirq()
+      callback provided by the device's driver and return its result, or return
+      0 if not defined
+
   int pm_generic_resume(struct device *dev);
     - invoke the ->resume() callback provided by the driver of this device and,
       if successful, change the device's runtime PM status to 'active'
 
+  int pm_generic_resume_noirq(struct device *dev);
+    - invoke the ->resume_noirq() callback provided by the driver of this device
+
   int pm_generic_freeze(struct device *dev);
     - if the device has not been suspended at run time, invoke the ->freeze()
       callback provided by its driver and return its result, or return 0 if not
       defined
 
+  int pm_generic_freeze_noirq(struct device *dev);
+    - if pm_runtime_suspended(dev) returns "false", invoke the ->freeze_noirq()
+      callback provided by the device's driver and return its result, or return
+      0 if not defined
+
   int pm_generic_thaw(struct device *dev);
     - if the device has not been suspended at run time, invoke the ->thaw()
       callback provided by its driver and return its result, or return 0 if not
       defined
 
+  int pm_generic_thaw_noirq(struct device *dev);
+    - if pm_runtime_suspended(dev) returns "false", invoke the ->thaw_noirq()
+      callback provided by the device's driver and return its result, or return
+      0 if not defined
+
   int pm_generic_poweroff(struct device *dev);
     - if the device has not been suspended at run time, invoke the ->poweroff()
       callback provided by its driver and return its result, or return 0 if not
       defined
 
+  int pm_generic_poweroff_noirq(struct device *dev);
+    - if pm_runtime_suspended(dev) returns "false", run the ->poweroff_noirq()
+      callback provided by the device's driver and return its result, or return
+      0 if not defined
+
   int pm_generic_restore(struct device *dev);
     - invoke the ->restore() callback provided by the driver of this device and,
       if successful, change the device's runtime PM status to 'active'
 
+  int pm_generic_restore_noirq(struct device *dev);
+    - invoke the ->restore_noirq() callback provided by the device's driver
+
 These functions can be assigned to the ->runtime_idle(), ->runtime_suspend(),
-->runtime_resume(), ->suspend(), ->resume(), ->freeze(), ->thaw(), ->poweroff(),
-or ->restore() callback pointers in the subsystem-level dev_pm_ops structures.
+->runtime_resume(), ->suspend(), ->suspend_noirq(), ->resume(),
+->resume_noirq(), ->freeze(), ->freeze_noirq(), ->thaw(), ->thaw_noirq(),
+->poweroff(), ->poweroff_noirq(), ->restore(), ->restore_noirq() callback
+pointers in the subsystem-level dev_pm_ops structures.
 
 If a subsystem wishes to use all of them at the same time, it can simply assign
 the GENERIC_SUBSYS_PM_OPS macro, defined in include/linux/pm.h, to its

arch/arm/Kconfig

@@ -642,6 +642,7 @@ config ARCH_SHMOBILE
 	select NO_IOPORT
 	select SPARSE_IRQ
 	select MULTI_IRQ_HANDLER
+	select PM_GENERIC_DOMAINS if PM
 	help
 	  Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
 

arch/arm/mach-omap1/pm_bus.c

@@ -32,7 +32,7 @@ static int omap1_pm_runtime_suspend(struct device *dev)
 	if (ret)
 		return ret;
 
-	ret = pm_runtime_clk_suspend(dev);
+	ret = pm_clk_suspend(dev);
 	if (ret) {
 		pm_generic_runtime_resume(dev);
 		return ret;
@@ -45,24 +45,24 @@ static int omap1_pm_runtime_resume(struct device *dev)
 {
 	dev_dbg(dev, "%s\n", __func__);
 
-	pm_runtime_clk_resume(dev);
+	pm_clk_resume(dev);
 	return pm_generic_runtime_resume(dev);
 }
 
-static struct dev_power_domain default_power_domain = {
+static struct dev_pm_domain default_pm_domain = {
 	.ops = {
 		.runtime_suspend = omap1_pm_runtime_suspend,
 		.runtime_resume = omap1_pm_runtime_resume,
 		USE_PLATFORM_PM_SLEEP_OPS
 	},
 };
-#define OMAP1_PWR_DOMAIN (&default_power_domain)
+#define OMAP1_PM_DOMAIN (&default_pm_domain)
 #else
-#define OMAP1_PWR_DOMAIN NULL
+#define OMAP1_PM_DOMAIN NULL
 #endif /* CONFIG_PM_RUNTIME */
 
 static struct pm_clk_notifier_block platform_bus_notifier = {
-	.pwr_domain = OMAP1_PWR_DOMAIN,
+	.pm_domain = OMAP1_PM_DOMAIN,
 	.con_ids = { "ick", "fck", NULL, },
 };
 
@@ -71,7 +71,7 @@ static int __init omap1_pm_runtime_init(void)
 	if (!cpu_class_is_omap1())
 		return -ENODEV;
 
-	pm_runtime_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
+	pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
 
 	return 0;
 }

arch/arm/mach-shmobile/board-ap4evb.c

@@ -1408,9 +1408,14 @@ static void __init ap4evb_init(void)
 
 	platform_add_devices(ap4evb_devices, ARRAY_SIZE(ap4evb_devices));
 
+	sh7372_add_device_to_domain(&sh7372_a4lc, &lcdc1_device);
+	sh7372_add_device_to_domain(&sh7372_a4lc, &lcdc_device);
+	sh7372_add_device_to_domain(&sh7372_a4mp, &fsi_device);
+
 	hdmi_init_pm_clock();
 	fsi_init_pm_clock();
 	sh7372_pm_init();
+	pm_clk_add(&fsi_device.dev, "spu2");
 }
 
 static void __init ap4evb_timer_init(void)

arch/arm/mach-shmobile/board-mackerel.c

@@ -1582,8 +1582,13 @@ static void __init mackerel_init(void)
 
 	platform_add_devices(mackerel_devices, ARRAY_SIZE(mackerel_devices));
 
+	sh7372_add_device_to_domain(&sh7372_a4lc, &lcdc_device);
+	sh7372_add_device_to_domain(&sh7372_a4lc, &hdmi_lcdc_device);
+	sh7372_add_device_to_domain(&sh7372_a4mp, &fsi_device);
+
 	hdmi_init_pm_clock();
 	sh7372_pm_init();
+	pm_clk_add(&fsi_device.dev, "spu2");
 }
 
 static void __init mackerel_timer_init(void)

arch/arm/mach-shmobile/clock-sh7372.c

@@ -662,6 +662,7 @@ static struct clk_lookup lookups[] = {
 	CLKDEV_ICK_ID("ick", "sh-mobile-hdmi", &div6_reparent_clks[DIV6_HDMI]),
 	CLKDEV_ICK_ID("icka", "sh_fsi2", &div6_reparent_clks[DIV6_FSIA]),
 	CLKDEV_ICK_ID("ickb", "sh_fsi2", &div6_reparent_clks[DIV6_FSIB]),
+	CLKDEV_ICK_ID("spu2", "sh_fsi2", &mstp_clks[MSTP223]),
 };
 
 void __init sh7372_clock_init(void)

arch/arm/mach-shmobile/include/mach/sh7372.h

@@ -12,6 +12,7 @@
 #define __ASM_SH7372_H__
 
 #include <linux/sh_clk.h>
+#include <linux/pm_domain.h>
 
 /*
  * Pin Function Controller:
@@ -470,4 +471,32 @@ extern struct clk sh7372_fsibck_clk;
 extern struct clk sh7372_fsidiva_clk;
 extern struct clk sh7372_fsidivb_clk;
 
+struct platform_device;
+
+struct sh7372_pm_domain {
+	struct generic_pm_domain genpd;
+	unsigned int bit_shift;
+};
+
+static inline struct sh7372_pm_domain *to_sh7372_pd(struct generic_pm_domain *d)
+{
+	return container_of(d, struct sh7372_pm_domain, genpd);
+}
+
+#ifdef CONFIG_PM
+extern struct sh7372_pm_domain sh7372_a4lc;
+extern struct sh7372_pm_domain sh7372_a4mp;
+extern struct sh7372_pm_domain sh7372_d4;
+extern struct sh7372_pm_domain sh7372_a3rv;
+extern struct sh7372_pm_domain sh7372_a3ri;
+extern struct sh7372_pm_domain sh7372_a3sg;
+
+extern void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd);
+extern void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
+					struct platform_device *pdev);
+#else
+#define sh7372_init_pm_domain(pd) do { } while(0)
+#define sh7372_add_device_to_domain(pd, pdev) do { } while(0)
+#endif /* CONFIG_PM */
+
 #endif /* __ASM_SH7372_H__ */

arch/arm/mach-shmobile/pm-sh7372.c

@@ -15,16 +15,176 @@
 #include <linux/list.h>
 #include <linux/err.h>
 #include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
 #include <asm/system.h>
 #include <asm/io.h>
 #include <asm/tlbflush.h>
 #include <mach/common.h>
+#include <mach/sh7372.h>
 
 #define SMFRAM 0xe6a70000
 #define SYSTBCR 0xe6150024
 #define SBAR 0xe6180020
 #define APARMBAREA 0xe6f10020
 
+#define SPDCR 0xe6180008
+#define SWUCR 0xe6180014
+#define PSTR 0xe6180080
+
+#define PSTR_RETRIES 100
+#define PSTR_DELAY_US 10
+
+#ifdef CONFIG_PM
+
+static int pd_power_down(struct generic_pm_domain *genpd)
+{
+	struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd);
+	unsigned int mask = 1 << sh7372_pd->bit_shift;
+
+	if (__raw_readl(PSTR) & mask) {
+		unsigned int retry_count;
+
+		__raw_writel(mask, SPDCR);
+
+		for (retry_count = PSTR_RETRIES; retry_count; retry_count--) {
+			if (!(__raw_readl(SPDCR) & mask))
+				break;
+			cpu_relax();
+		}
+	}
+
+	pr_debug("sh7372 power domain down 0x%08x -> PSTR = 0x%08x\n",
+		 mask, __raw_readl(PSTR));
+
+	return 0;
+}
+
+static int pd_power_up(struct generic_pm_domain *genpd)
+{
+	struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd);
+	unsigned int mask = 1 << sh7372_pd->bit_shift;
+	unsigned int retry_count;
+	int ret = 0;
+
+	if (__raw_readl(PSTR) & mask)
+		goto out;
+
+	__raw_writel(mask, SWUCR);
+
+	for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) {
+		if (!(__raw_readl(SWUCR) & mask))
+			goto out;
+		if (retry_count > PSTR_RETRIES)
+			udelay(PSTR_DELAY_US);
+		else
+			cpu_relax();
+	}
+	if (__raw_readl(SWUCR) & mask)
+		ret = -EIO;
+
+ out:
+	pr_debug("sh7372 power domain up 0x%08x -> PSTR = 0x%08x\n",
+		 mask, __raw_readl(PSTR));
+
+	return ret;
+}
+
+static int pd_power_up_a3rv(struct generic_pm_domain *genpd)
+{
+	int ret = pd_power_up(genpd);
+
+	/* force A4LC on after A3RV has been requested on */
+	pm_genpd_poweron(&sh7372_a4lc.genpd);
+
+	return ret;
+}
+
+static int pd_power_down_a3rv(struct generic_pm_domain *genpd)
+{
+	int ret = pd_power_down(genpd);
+
+	/* try to power down A4LC after A3RV is requested off */
+	genpd_queue_power_off_work(&sh7372_a4lc.genpd);
+
+	return ret;
+}
+
+static int pd_power_down_a4lc(struct generic_pm_domain *genpd)
+{
+	/* only power down A4LC if A3RV is off */
+	if (!(__raw_readl(PSTR) & (1 << sh7372_a3rv.bit_shift)))
+		return pd_power_down(genpd);
+
+	return -EBUSY;
+}
+
+static bool pd_active_wakeup(struct device *dev)
+{
+	return true;
+}
+
+void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd)
+{
+	struct generic_pm_domain *genpd = &sh7372_pd->genpd;
+
+	pm_genpd_init(genpd, NULL, false);
+	genpd->stop_device = pm_clk_suspend;
+	genpd->start_device = pm_clk_resume;
+	genpd->active_wakeup = pd_active_wakeup;
+
+	if (sh7372_pd == &sh7372_a4lc) {
+		genpd->power_off = pd_power_down_a4lc;
+		genpd->power_on = pd_power_up;
+	} else if (sh7372_pd == &sh7372_a3rv) {
+		genpd->power_off = pd_power_down_a3rv;
+		genpd->power_on = pd_power_up_a3rv;
+	} else {
+		genpd->power_off = pd_power_down;
+		genpd->power_on = pd_power_up;
+	}
+	genpd->power_on(&sh7372_pd->genpd);
+}
+
+void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
+				 struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+
+	if (!dev->power.subsys_data) {
+		pm_clk_init(dev);
+		pm_clk_add(dev, NULL);
+	}
+	pm_genpd_add_device(&sh7372_pd->genpd, dev);
+}
+
+struct sh7372_pm_domain sh7372_a4lc = {
+	.bit_shift = 1,
+};
+
+struct sh7372_pm_domain sh7372_a4mp = {
+	.bit_shift = 2,
+};
+
+struct sh7372_pm_domain sh7372_d4 = {
+	.bit_shift = 3,
+};
+
+struct sh7372_pm_domain sh7372_a3rv = {
+	.bit_shift = 6,
+};
+
+struct sh7372_pm_domain sh7372_a3ri = {
+	.bit_shift = 8,
+};
+
+struct sh7372_pm_domain sh7372_a3sg = {
+	.bit_shift = 13,
+};
+
+#endif /* CONFIG_PM */
+
 static void sh7372_enter_core_standby(void)
 {
 	void __iomem *smfram = (void __iomem *)SMFRAM;

arch/arm/mach-shmobile/pm_runtime.c

@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/io.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_domain.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/sh_clk.h>
@@ -28,31 +29,38 @@ static int default_platform_runtime_idle(struct device *dev)
 	return pm_runtime_suspend(dev);
 }
 
-static struct dev_power_domain default_power_domain = {
+static struct dev_pm_domain default_pm_domain = {
 	.ops = {
-		.runtime_suspend = pm_runtime_clk_suspend,
-		.runtime_resume = pm_runtime_clk_resume,
+		.runtime_suspend = pm_clk_suspend,
+		.runtime_resume = pm_clk_resume,
 		.runtime_idle = default_platform_runtime_idle,
 		USE_PLATFORM_PM_SLEEP_OPS
 	},
 };
 
-#define DEFAULT_PWR_DOMAIN_PTR	(&default_power_domain)
+#define DEFAULT_PM_DOMAIN_PTR	(&default_pm_domain)
 
 #else
 
-#define DEFAULT_PWR_DOMAIN_PTR	NULL
+#define DEFAULT_PM_DOMAIN_PTR	NULL
 
 #endif /* CONFIG_PM_RUNTIME */
 
 static struct pm_clk_notifier_block platform_bus_notifier = {
-	.pwr_domain = DEFAULT_PWR_DOMAIN_PTR,
+	.pm_domain = DEFAULT_PM_DOMAIN_PTR,
 	.con_ids = { NULL, },
 };
 
 static int __init sh_pm_runtime_init(void)
 {
-	pm_runtime_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
+	pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
 	return 0;
 }
 core_initcall(sh_pm_runtime_init);
+
+static int __init sh_pm_runtime_late_init(void)
+{
+	pm_genpd_poweroff_unused();
+	return 0;
+}
+late_initcall(sh_pm_runtime_late_init);

arch/arm/mach-shmobile/setup-sh7372.c

@@ -841,11 +841,22 @@ static struct platform_device *sh7372_late_devices[] __initdata = {
 
 void __init sh7372_add_standard_devices(void)
 {
+	sh7372_init_pm_domain(&sh7372_a4lc);
+	sh7372_init_pm_domain(&sh7372_a4mp);
+	sh7372_init_pm_domain(&sh7372_d4);
+	sh7372_init_pm_domain(&sh7372_a3rv);
+	sh7372_init_pm_domain(&sh7372_a3ri);
+	sh7372_init_pm_domain(&sh7372_a3sg);
+
 	platform_add_devices(sh7372_early_devices,
 			    ARRAY_SIZE(sh7372_early_devices));
 
 	platform_add_devices(sh7372_late_devices,
 			    ARRAY_SIZE(sh7372_late_devices));
+
+	sh7372_add_device_to_domain(&sh7372_a3rv, &vpu_device);
+	sh7372_add_device_to_domain(&sh7372_a4mp, &spu0_device);
+	sh7372_add_device_to_domain(&sh7372_a4mp, &spu1_device);
 }
 
 void __init sh7372_add_early_devices(void)

arch/arm/plat-omap/omap_device.c

@@ -564,7 +564,7 @@ static int _od_runtime_resume(struct device *dev)
 	return pm_generic_runtime_resume(dev);
 }
 
-static struct dev_power_domain omap_device_power_domain = {
+static struct dev_pm_domain omap_device_pm_domain = {
 	.ops = {
 		.runtime_suspend = _od_runtime_suspend,
 		.runtime_idle = _od_runtime_idle,
@@ -586,7 +586,7 @@ int omap_device_register(struct omap_device *od)
 	pr_debug("omap_device: %s: registering\n", od->pdev.name);
 
 	od->pdev.dev.parent = &omap_device_parent;
-	od->pdev.dev.pwr_domain = &omap_device_power_domain;
+	od->pdev.dev.pm_domain = &omap_device_pm_domain;
 	return platform_device_register(&od->pdev);
 }
 

arch/sh/kernel/cpu/shmobile/pm_runtime.c

@@ -256,7 +256,7 @@ out:
 	return ret;
 }
 
-static struct dev_power_domain default_power_domain = {
+static struct dev_pm_domain default_pm_domain = {
 	.ops = {
 		.runtime_suspend = default_platform_runtime_suspend,
 		.runtime_resume = default_platform_runtime_resume,
@@ -285,7 +285,7 @@ static int platform_bus_notify(struct notifier_block *nb,
 		hwblk_disable(hwblk_info, hwblk);
 		/* make sure driver re-inits itself once */
 		__set_bit(PDEV_ARCHDATA_FLAG_INIT, &pdev->archdata.flags);
-		dev->pwr_domain = &default_power_domain;
+		dev->pm_domain = &default_pm_domain;
 		break;
 	/* TODO: add BUS_NOTIFY_BIND_DRIVER and increase idle count */
 	case BUS_NOTIFY_BOUND_DRIVER:
@@ -299,7 +299,7 @@ static int platform_bus_notify(struct notifier_block *nb,
 		__set_bit(PDEV_ARCHDATA_FLAG_INIT, &pdev->archdata.flags);
 		break;
 	case BUS_NOTIFY_DEL_DEVICE:
-		dev->pwr_domain = NULL;
+		dev->pm_domain = NULL;
 		break;
 	}
 	return 0;

drivers/base/power/Makefile

@@ -3,6 +3,7 @@ obj-$(CONFIG_PM_SLEEP)	+= main.o wakeup.o
 obj-$(CONFIG_PM_RUNTIME)	+= runtime.o
 obj-$(CONFIG_PM_TRACE_RTC)	+= trace.o
 obj-$(CONFIG_PM_OPP)	+= opp.o
+obj-$(CONFIG_PM_GENERIC_DOMAINS)	+=  domain.o
 obj-$(CONFIG_HAVE_CLK)	+= clock_ops.o
 
 ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG

drivers/base/power/clock_ops.c

@@ -15,9 +15,9 @@
 #include <linux/slab.h>
 #include <linux/err.h>
 
-#ifdef CONFIG_PM_RUNTIME
+#ifdef CONFIG_PM
 
-struct pm_runtime_clk_data {
+struct pm_clk_data {
 	struct list_head clock_list;
 	struct mutex lock;
 };
@@ -36,25 +36,25 @@ struct pm_clock_entry {
 	enum pce_status status;
 };
 
-static struct pm_runtime_clk_data *__to_prd(struct device *dev)
+static struct pm_clk_data *__to_pcd(struct device *dev)
 {
 	return dev ? dev->power.subsys_data : NULL;
 }
 
 /**
- * pm_runtime_clk_add - Start using a device clock for runtime PM.
- * @dev: Device whose clock is going to be used for runtime PM.
+ * pm_clk_add - Start using a device clock for power management.
+ * @dev: Device whose clock is going to be used for power management.
  * @con_id: Connection ID of the clock.
  *
  * Add the clock represented by @con_id to the list of clocks used for
- * the runtime PM of @dev.
+ * the power management of @dev.
  */
-int pm_runtime_clk_add(struct device *dev, const char *con_id)
+int pm_clk_add(struct device *dev, const char *con_id)
 {
-	struct pm_runtime_clk_data *prd = __to_prd(dev);
+	struct pm_clk_data *pcd = __to_pcd(dev);
 	struct pm_clock_entry *ce;
 
-	if (!prd)
+	if (!pcd)
 		return -EINVAL;
 
 	ce = kzalloc(sizeof(*ce), GFP_KERNEL);
@@ -73,20 +73,20 @@ int pm_runtime_clk_add(struct device *dev, const char *con_id)
 		}
 	}
 
-	mutex_lock(&prd->lock);
-	list_add_tail(&ce->node, &prd->clock_list);
-	mutex_unlock(&prd->lock);
+	mutex_lock(&pcd->lock);
+	list_add_tail(&ce->node, &pcd->clock_list);
+	mutex_unlock(&pcd->lock);
 	return 0;
 }
 
 /**
- * __pm_runtime_clk_remove - Destroy runtime PM clock entry.
- * @ce: Runtime PM clock entry to destroy.
+ * __pm_clk_remove - Destroy PM clock entry.
+ * @ce: PM clock entry to destroy.
  *
- * This routine must be called under the mutex protecting the runtime PM list
- * of clocks corresponding the the @ce's device.
+ * This routine must be called under the mutex protecting the PM list of clocks
+ * corresponding the the @ce's device.
  */
-static void __pm_runtime_clk_remove(struct pm_clock_entry *ce)
+static void __pm_clk_remove(struct pm_clock_entry *ce)
 {
 	if (!ce)
 		return;
@@ -108,95 +108,99 @@ static void __pm_runtime_clk_remove(struct pm_clock_entry *ce)
 }
 
 /**
- * pm_runtime_clk_remove - Stop using a device clock for runtime PM.
- * @dev: Device whose clock should not be used for runtime PM any more.
+ * pm_clk_remove - Stop using a device clock for power management.
+ * @dev: Device whose clock should not be used for PM any more.
  * @con_id: Connection ID of the clock.
  *
  * Remove the clock represented by @con_id from the list of clocks used for
- * the runtime PM of @dev.
+ * the power management of @dev.
  */
-void pm_runtime_clk_remove(struct device *dev, const char *con_id)
+void pm_clk_remove(struct device *dev, const char *con_id)
 {
-	struct pm_runtime_clk_data *prd = __to_prd(dev);
+	struct pm_clk_data *pcd = __to_pcd(dev);
 	struct pm_clock_entry *ce;
 
-	if (!prd)
+	if (!pcd)
 		return;
 
-	mutex_lock(&prd->lock);
+	mutex_lock(&pcd->lock);
 
-	list_for_each_entry(ce, &prd->clock_list, node) {
+	list_for_each_entry(ce, &pcd->clock_list, node) {
 		if (!con_id && !ce->con_id) {
-			__pm_runtime_clk_remove(ce);
+			__pm_clk_remove(ce);
 			break;
 		} else if (!con_id || !ce->con_id) {
 			continue;
 		} else if (!strcmp(con_id, ce->con_id)) {
-			__pm_runtime_clk_remove(ce);
+			__pm_clk_remove(ce);
 			break;
 		}
 	}
 
-	mutex_unlock(&prd->lock);
+	mutex_unlock(&pcd->lock);
 }
 
 /**
- * pm_runtime_clk_init - Initialize a device's list of runtime PM clocks.
- * @dev: Device to initialize the list of runtime PM clocks for.
+ * pm_clk_init - Initialize a device's list of power management clocks.
+ * @dev: Device to initialize the list of PM clocks for.
  *
- * Allocate a struct pm_runtime_clk_data object, initialize its lock member and
+ * Allocate a struct pm_clk_data object, initialize its lock member and
  * make the @dev's power.subsys_data field point to it.
  */
-int pm_runtime_clk_init(struct device *dev)
+int pm_clk_init(struct device *dev)
 {
-	struct pm_runtime_clk_data *prd;
+	struct pm_clk_data *pcd;
 
-	prd = kzalloc(sizeof(*prd), GFP_KERNEL);
-	if (!prd) {
-		dev_err(dev, "Not enough memory fo runtime PM data.\n");
+	pcd = kzalloc(sizeof(*pcd), GFP_KERNEL);
+	if (!pcd) {
+		dev_err(dev, "Not enough memory for PM clock data.\n");
 		return -ENOMEM;
 	}
 
-	INIT_LIST_HEAD(&prd->clock_list);
-	mutex_init(&prd->lock);
-	dev->power.subsys_data = prd;
+	INIT_LIST_HEAD(&pcd->clock_list);
+	mutex_init(&pcd->lock);
+	dev->power.subsys_data = pcd;
 	return 0;
 }
 
 /**
- * pm_runtime_clk_destroy - Destroy a device's list of runtime PM clocks.
- * @dev: Device to destroy the list of runtime PM clocks for.
+ * pm_clk_destroy - Destroy a device's list of power management clocks.
+ * @dev: Device to destroy the list of PM clocks for.
  *
  * Clear the @dev's power.subsys_data field, remove the list of clock entries
- * from the struct pm_runtime_clk_data object pointed to by it before and free
+ * from the struct pm_clk_data object pointed to by it before and free
  * that object.
  */
-void pm_runtime_clk_destroy(struct device *dev)
+void pm_clk_destroy(struct device *dev)
 {
-	struct pm_runtime_clk_data *prd = __to_prd(dev);
+	struct pm_clk_data *pcd = __to_pcd(dev);
 	struct pm_clock_entry *ce, *c;
 
-	if (!prd)
+	if (!pcd)
 		return;
 
 	dev->power.subsys_data = NULL;
 
-	mutex_lock(&prd->lock);
+	mutex_lock(&pcd->lock);
 
-	list_for_each_entry_safe_reverse(ce, c, &prd->clock_list, node)
-		__pm_runtime_clk_remove(ce);
+	list_for_each_entry_safe_reverse(ce, c, &pcd->clock_list, node)
+		__pm_clk_remove(ce);
 
-	mutex_unlock(&prd->lock);
+	mutex_unlock(&pcd->lock);
 
-	kfree(prd);
+	kfree(pcd);
 }
 
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_PM_RUNTIME
+
 /**
- * pm_runtime_clk_acquire - Acquire a device clock.
+ * pm_clk_acquire - Acquire a device clock.
  * @dev: Device whose clock is to be acquired.
  * @con_id: Connection ID of the clock.
  */
-static void pm_runtime_clk_acquire(struct device *dev,
+static void pm_clk_acquire(struct device *dev,
 				    struct pm_clock_entry *ce)
 {
 	ce->clk = clk_get(dev, ce->con_id);
@@ -209,24 +213,24 @@ static void pm_runtime_clk_acquire(struct device *dev,
 }
 
 /**
- * pm_runtime_clk_suspend - Disable clocks in a device's runtime PM clock list.
+ * pm_clk_suspend - Disable clocks in a device's PM clock list.
  * @dev: Device to disable the clocks for.
  */
-int pm_runtime_clk_suspend(struct device *dev)
+int pm_clk_suspend(struct device *dev)
 {
-	struct pm_runtime_clk_data *prd = __to_prd(dev);
+	struct pm_clk_data *pcd = __to_pcd(dev);
 	struct pm_clock_entry *ce;
 
 	dev_dbg(dev, "%s()\n", __func__);
 
-	if (!prd)
+	if (!pcd)
 		return 0;
 
-	mutex_lock(&prd->lock);
+	mutex_lock(&pcd->lock);
 
-	list_for_each_entry_reverse(ce, &prd->clock_list, node) {
+	list_for_each_entry_reverse(ce, &pcd->clock_list, node) {
 		if (ce->status == PCE_STATUS_NONE)
-			pm_runtime_clk_acquire(dev, ce);
+			pm_clk_acquire(dev, ce);
 
 		if (ce->status < PCE_STATUS_ERROR) {
 			clk_disable(ce->clk);
@@ -234,30 +238,30 @@ int pm_runtime_clk_suspend(struct device *dev)
 		}
 	}
 
-	mutex_unlock(&prd->lock);
+	mutex_unlock(&pcd->lock);
 
 	return 0;
 }
 
 /**
- * pm_runtime_clk_resume - Enable clocks in a device's runtime PM clock list.
+ * pm_clk_resume - Enable clocks in a device's PM clock list.
  * @dev: Device to enable the clocks for.
  */
-int pm_runtime_clk_resume(struct device *dev)
+int pm_clk_resume(struct device *dev)
 {
-	struct pm_runtime_clk_data *prd = __to_prd(dev);
+	struct pm_clk_data *pcd = __to_pcd(dev);
 	struct pm_clock_entry *ce;
 
 	dev_dbg(dev, "%s()\n", __func__);
 
-	if (!prd)
+	if (!pcd)
 		return 0;
 
-	mutex_lock(&prd->lock);
+	mutex_lock(&pcd->lock);
 
-	list_for_each_entry(ce, &prd->clock_list, node) {
+	list_for_each_entry(ce, &pcd->clock_list, node) {
 		if (ce->status == PCE_STATUS_NONE)
-			pm_runtime_clk_acquire(dev, ce);
+			pm_clk_acquire(dev, ce);
 
 		if (ce->status < PCE_STATUS_ERROR) {
 			clk_enable(ce->clk);
@@ -265,28 +269,28 @@ int pm_runtime_clk_resume(struct device *dev)
 		}
 	}
 
-	mutex_unlock(&prd->lock);
+	mutex_unlock(&pcd->lock);
 
 	return 0;
 }
 
 /**
- * pm_runtime_clk_notify - Notify routine for device addition and removal.
+ * pm_clk_notify - Notify routine for device addition and removal.
  * @nb: Notifier block object this function is a member of.
  * @action: Operation being carried out by the caller.
  * @data: Device the routine is being run for.
  *
  * For this function to work, @nb must be a member of an object of type
  * struct pm_clk_notifier_block containing all of the requisite data.
- * Specifically, the pwr_domain member of that object is copied to the device's
- * pwr_domain field and its con_ids member is used to populate the device's list
- * of runtime PM clocks, depending on @action.
+ * Specifically, the pm_domain member of that object is copied to the device's
+ * pm_domain field and its con_ids member is used to populate the device's list
+ * of PM clocks, depending on @action.
  *
- * If the device's pwr_domain field is already populated with a value different
+ * If the device's pm_domain field is already populated with a value different
  * from the one stored in the struct pm_clk_notifier_block object, the function
  * does nothing.
  */
-static int pm_runtime_clk_notify(struct notifier_block *nb,
+static int pm_clk_notify(struct notifier_block *nb,
 				 unsigned long action, void *data)
 {
 	struct pm_clk_notifier_block *clknb;
@@ -300,28 +304,28 @@ static int pm_runtime_clk_notify(struct notifier_block *nb,
 
 	switch (action) {
 	case BUS_NOTIFY_ADD_DEVICE:
-		if (dev->pwr_domain)
+		if (dev->pm_domain)
 			break;
 
-		error = pm_runtime_clk_init(dev);
+		error = pm_clk_init(dev);
 		if (error)
 			break;
 
-		dev->pwr_domain = clknb->pwr_domain;
+		dev->pm_domain = clknb->pm_domain;
 		if (clknb->con_ids[0]) {
 			for (con_id = clknb->con_ids; *con_id; con_id++)
-				pm_runtime_clk_add(dev, *con_id);
+				pm_clk_add(dev, *con_id);
 		} else {
-			pm_runtime_clk_add(dev, NULL);
+			pm_clk_add(dev, NULL);
 		}
 
 		break;
 	case BUS_NOTIFY_DEL_DEVICE:
-		if (dev->pwr_domain != clknb->pwr_domain)
+		if (dev->pm_domain != clknb->pm_domain)
 			break;
 
-		dev->pwr_domain = NULL;
-		pm_runtime_clk_destroy(dev);
+		dev->pm_domain = NULL;
+		pm_clk_destroy(dev);
 		break;
 	}
 
@@ -330,6 +334,60 @@ static int pm_runtime_clk_notify(struct notifier_block *nb,
 
 #else /* !CONFIG_PM_RUNTIME */
 
+#ifdef CONFIG_PM
+
+/**
+ * pm_clk_suspend - Disable clocks in a device's PM clock list.
+ * @dev: Device to disable the clocks for.
+ */
+int pm_clk_suspend(struct device *dev)
+{
+	struct pm_clk_data *pcd = __to_pcd(dev);
+	struct pm_clock_entry *ce;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	/* If there is no driver, the clocks are already disabled. */
+	if (!pcd || !dev->driver)
+		return 0;
+
+	mutex_lock(&pcd->lock);
+
+	list_for_each_entry_reverse(ce, &pcd->clock_list, node)
+		clk_disable(ce->clk);
+
+	mutex_unlock(&pcd->lock);
+
+	return 0;
+}
+
+/**
+ * pm_clk_resume - Enable clocks in a device's PM clock list.
+ * @dev: Device to enable the clocks for.
+ */
+int pm_clk_resume(struct device *dev)
+{
+	struct pm_clk_data *pcd = __to_pcd(dev);
+	struct pm_clock_entry *ce;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	/* If there is no driver, the clocks should remain disabled. */
+	if (!pcd || !dev->driver)
+		return 0;
+
+	mutex_lock(&pcd->lock);
+
+	list_for_each_entry(ce, &pcd->clock_list, node)
+		clk_enable(ce->clk);
+
+	mutex_unlock(&pcd->lock);
+
+	return 0;
+}
+
+#endif /* CONFIG_PM */
+
 /**
  * enable_clock - Enable a device clock.
  * @dev: Device whose clock is to be enabled.
@@ -365,7 +423,7 @@ static void disable_clock(struct device *dev, const char *con_id)
 }
 
 /**
- * pm_runtime_clk_notify - Notify routine for device addition and removal.
+ * pm_clk_notify - Notify routine for device addition and removal.
  * @nb: Notifier block object this function is a member of.
  * @action: Operation being carried out by the caller.
  * @data: Device the routine is being run for.
@@ -375,7 +433,7 @@ static void disable_clock(struct device *dev, const char *con_id)
  * Specifically, the con_ids member of that object is used to enable or disable
  * the device's clocks, depending on @action.
  */
-static int pm_runtime_clk_notify(struct notifier_block *nb,
+static int pm_clk_notify(struct notifier_block *nb,
 				 unsigned long action, void *data)
 {
 	struct pm_clk_notifier_block *clknb;
@@ -411,21 +469,21 @@ static int pm_runtime_clk_notify(struct notifier_block *nb,
 #endif /* !CONFIG_PM_RUNTIME */
 
 /**
- * pm_runtime_clk_add_notifier - Add bus type notifier for runtime PM clocks.
+ * pm_clk_add_notifier - Add bus type notifier for power management clocks.
  * @bus: Bus type to add the notifier to.
  * @clknb: Notifier to be added to the given bus type.
  *
  * The nb member of @clknb is not expected to be initialized and its
- * notifier_call member will be replaced with pm_runtime_clk_notify().  However,
+ * notifier_call member will be replaced with pm_clk_notify().  However,
  * the remaining members of @clknb should be populated prior to calling this
  * routine.
  */
-void pm_runtime_clk_add_notifier(struct bus_type *bus,
+void pm_clk_add_notifier(struct bus_type *bus,
 				 struct pm_clk_notifier_block *clknb)
 {
 	if (!bus || !clknb)
 		return;
 
-	clknb->nb.notifier_call = pm_runtime_clk_notify;
+	clknb->nb.notifier_call = pm_clk_notify;
 	bus_register_notifier(bus, &clknb->nb);
 }

drivers/base/power/domain.c

@@ -0,0 +1,1273 @@
+/*
+ * drivers/base/power/domain.c - Common code related to device power domains.
+ *
+ * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_domain.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/sched.h>
+#include <linux/suspend.h>
+
+static LIST_HEAD(gpd_list);
+static DEFINE_MUTEX(gpd_list_lock);
+
+#ifdef CONFIG_PM
+
+static struct generic_pm_domain *dev_to_genpd(struct device *dev)
+{
+	if (IS_ERR_OR_NULL(dev->pm_domain))
+		return ERR_PTR(-EINVAL);
+
+	return pd_to_genpd(dev->pm_domain);
+}
+
+static void genpd_sd_counter_dec(struct generic_pm_domain *genpd)
+{
+	if (!WARN_ON(genpd->sd_count == 0))
+			genpd->sd_count--;
+}
+
+static void genpd_acquire_lock(struct generic_pm_domain *genpd)
+{
+	DEFINE_WAIT(wait);
+
+	mutex_lock(&genpd->lock);
+	/*
+	 * Wait for the domain to transition into either the active,
+	 * or the power off state.
+	 */
+	for (;;) {
+		prepare_to_wait(&genpd->status_wait_queue, &wait,
+				TASK_UNINTERRUPTIBLE);
+		if (genpd->status == GPD_STATE_ACTIVE
+		    || genpd->status == GPD_STATE_POWER_OFF)
+			break;
+		mutex_unlock(&genpd->lock);
+
+		schedule();
+
+		mutex_lock(&genpd->lock);
+	}
+	finish_wait(&genpd->status_wait_queue, &wait);
+}
+
+static void genpd_release_lock(struct generic_pm_domain *genpd)
+{
+	mutex_unlock(&genpd->lock);
+}
+
+static void genpd_set_active(struct generic_pm_domain *genpd)
+{
+	if (genpd->resume_count == 0)
+		genpd->status = GPD_STATE_ACTIVE;
+}
+
+/**
+ * pm_genpd_poweron - Restore power to a given PM domain and its parents.
+ * @genpd: PM domain to power up.
+ *
+ * Restore power to @genpd and all of its parents so that it is possible to
+ * resume a device belonging to it.
+ */
+int pm_genpd_poweron(struct generic_pm_domain *genpd)
+{
+	struct generic_pm_domain *parent = genpd->parent;
+	DEFINE_WAIT(wait);
+	int ret = 0;
+
+ start:
+	if (parent) {
+		genpd_acquire_lock(parent);
+		mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
+	} else {
+		mutex_lock(&genpd->lock);
+	}
+
+	if (genpd->status == GPD_STATE_ACTIVE
+	    || (genpd->prepared_count > 0 && genpd->suspend_power_off))
+		goto out;
+
+	if (genpd->status != GPD_STATE_POWER_OFF) {
+		genpd_set_active(genpd);
+		goto out;
+	}
+
+	if (parent && parent->status != GPD_STATE_ACTIVE) {
+		mutex_unlock(&genpd->lock);
+		genpd_release_lock(parent);
+
+		ret = pm_genpd_poweron(parent);
+		if (ret)
+			return ret;
+
+		goto start;
+	}
+
+	if (genpd->power_on) {
+		int ret = genpd->power_on(genpd);
+		if (ret)
+			goto out;
+	}
+
+	genpd_set_active(genpd);
+	if (parent)
+		parent->sd_count++;
+
+ out:
+	mutex_unlock(&genpd->lock);
+	if (parent)
+		genpd_release_lock(parent);
+
+	return ret;
+}
+
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_PM_RUNTIME
+
+/**
+ * __pm_genpd_save_device - Save the pre-suspend state of a device.
+ * @dle: Device list entry of the device to save the state of.
+ * @genpd: PM domain the device belongs to.
+ */
+static int __pm_genpd_save_device(struct dev_list_entry *dle,
+				  struct generic_pm_domain *genpd)
+	__releases(&genpd->lock) __acquires(&genpd->lock)
+{
+	struct device *dev = dle->dev;
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (dle->need_restore)
+		return 0;
+
+	mutex_unlock(&genpd->lock);
+
+	if (drv && drv->pm && drv->pm->runtime_suspend) {
+		if (genpd->start_device)
+			genpd->start_device(dev);
+
+		ret = drv->pm->runtime_suspend(dev);
+
+		if (genpd->stop_device)
+			genpd->stop_device(dev);
+	}
+
+	mutex_lock(&genpd->lock);
+
+	if (!ret)
+		dle->need_restore = true;
+
+	return ret;
+}
+
+/**
+ * __pm_genpd_restore_device - Restore the pre-suspend state of a device.
+ * @dle: Device list entry of the device to restore the state of.
+ * @genpd: PM domain the device belongs to.
+ */
+static void __pm_genpd_restore_device(struct dev_list_entry *dle,
+				      struct generic_pm_domain *genpd)
+	__releases(&genpd->lock) __acquires(&genpd->lock)
+{
+	struct device *dev = dle->dev;
+	struct device_driver *drv = dev->driver;
+
+	if (!dle->need_restore)
+		return;
+
+	mutex_unlock(&genpd->lock);
+
+	if (drv && drv->pm && drv->pm->runtime_resume) {
+		if (genpd->start_device)
+			genpd->start_device(dev);
+
+		drv->pm->runtime_resume(dev);
+
+		if (genpd->stop_device)
+			genpd->stop_device(dev);
+	}
+
+	mutex_lock(&genpd->lock);
+
+	dle->need_restore = false;
+}
+
+/**
+ * genpd_abort_poweroff - Check if a PM domain power off should be aborted.
+ * @genpd: PM domain to check.
+ *
+ * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during
+ * a "power off" operation, which means that a "power on" has occured in the
+ * meantime, or if its resume_count field is different from zero, which means
+ * that one of its devices has been resumed in the meantime.
+ */
+static bool genpd_abort_poweroff(struct generic_pm_domain *genpd)
+{
+	return genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0;
+}
+
+/**
+ * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff().
+ * @genpd: PM domait to power off.
+ *
+ * Queue up the execution of pm_genpd_poweroff() unless it's already been done
+ * before.
+ */
+void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
+{
+	if (!work_pending(&genpd->power_off_work))
+		queue_work(pm_wq, &genpd->power_off_work);
+}
+
+/**
+ * pm_genpd_poweroff - Remove power from a given PM domain.
+ * @genpd: PM domain to power down.
+ *
+ * If all of the @genpd's devices have been suspended and all of its subdomains
+ * have been powered down, run the runtime suspend callbacks provided by all of
+ * the @genpd's devices' drivers and remove power from @genpd.
+ */
+static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
+	__releases(&genpd->lock) __acquires(&genpd->lock)
+{
+	struct generic_pm_domain *parent;
+	struct dev_list_entry *dle;
+	unsigned int not_suspended;
+	int ret = 0;
+
+ start:
+	/*
+	 * Do not try to power off the domain in the following situations:
+	 * (1) The domain is already in the "power off" state.
+	 * (2) System suspend is in progress.
+	 * (3) One of the domain's devices is being resumed right now.
+	 */
+	if (genpd->status == GPD_STATE_POWER_OFF || genpd->prepared_count > 0
+	    || genpd->resume_count > 0)
+		return 0;
+
+	if (genpd->sd_count > 0)
+		return -EBUSY;
+
+	not_suspended = 0;
+	list_for_each_entry(dle, &genpd->dev_list, node)
+		if (dle->dev->driver && !pm_runtime_suspended(dle->dev))
+			not_suspended++;
+
+	if (not_suspended > genpd->in_progress)
+		return -EBUSY;
+
+	if (genpd->poweroff_task) {
+		/*
+		 * Another instance of pm_genpd_poweroff() is executing
+		 * callbacks, so tell it to start over and return.
+		 */
+		genpd->status = GPD_STATE_REPEAT;
+		return 0;
+	}
+
+	if (genpd->gov && genpd->gov->power_down_ok) {
+		if (!genpd->gov->power_down_ok(&genpd->domain))
+			return -EAGAIN;
+	}
+
+	genpd->status = GPD_STATE_BUSY;
+	genpd->poweroff_task = current;
+
+	list_for_each_entry_reverse(dle, &genpd->dev_list, node) {
+		ret = __pm_genpd_save_device(dle, genpd);
+		if (ret) {
+			genpd_set_active(genpd);
+			goto out;
+		}
+
+		if (genpd_abort_poweroff(genpd))
+			goto out;
+
+		if (genpd->status == GPD_STATE_REPEAT) {
+			genpd->poweroff_task = NULL;
+			goto start;
+		}
+	}
+
+	parent = genpd->parent;
+	if (parent) {
+		mutex_unlock(&genpd->lock);
+
+		genpd_acquire_lock(parent);
+		mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
+
+		if (genpd_abort_poweroff(genpd)) {
+			genpd_release_lock(parent);
+			goto out;
+		}
+	}
+
+	if (genpd->power_off) {
+		ret = genpd->power_off(genpd);
+		if (ret == -EBUSY) {
+			genpd_set_active(genpd);
+			if (parent)
+				genpd_release_lock(parent);
+
+			goto out;
+		}
+	}
+
+	genpd->status = GPD_STATE_POWER_OFF;
+
+	if (parent) {
+		genpd_sd_counter_dec(parent);
+		if (parent->sd_count == 0)
+			genpd_queue_power_off_work(parent);
+
+		genpd_release_lock(parent);
+	}
+
+ out:
+	genpd->poweroff_task = NULL;
+	wake_up_all(&genpd->status_wait_queue);
+	return ret;
+}
+
+/**
+ * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
+ * @work: Work structure used for scheduling the execution of this function.
+ */
+static void genpd_power_off_work_fn(struct work_struct *work)
+{
+	struct generic_pm_domain *genpd;
+
+	genpd = container_of(work, struct generic_pm_domain, power_off_work);
+
+	genpd_acquire_lock(genpd);
+	pm_genpd_poweroff(genpd);
+	genpd_release_lock(genpd);
+}
+
+/**
+ * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
+ * @dev: Device to suspend.
+ *
+ * Carry out a runtime suspend of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_runtime_suspend(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	if (genpd->stop_device) {
+		int ret = genpd->stop_device(dev);
+		if (ret)
+			return ret;
+	}
+
+	mutex_lock(&genpd->lock);
+	genpd->in_progress++;
+	pm_genpd_poweroff(genpd);
+	genpd->in_progress--;
+	mutex_unlock(&genpd->lock);
+
+	return 0;
+}
+
+/**
+ * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
+ * @dev: Device to resume.
+ * @genpd: PM domain the device belongs to.
+ */
+static void __pm_genpd_runtime_resume(struct device *dev,
+				      struct generic_pm_domain *genpd)
+{
+	struct dev_list_entry *dle;
+
+	list_for_each_entry(dle, &genpd->dev_list, node) {
+		if (dle->dev == dev) {
+			__pm_genpd_restore_device(dle, genpd);
+			break;
+		}
+	}
+}
+
+/**
+ * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
+ * @dev: Device to resume.
+ *
+ * Carry out a runtime resume of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_runtime_resume(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+	DEFINE_WAIT(wait);
+	int ret;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	ret = pm_genpd_poweron(genpd);
+	if (ret)
+		return ret;
+
+	mutex_lock(&genpd->lock);
+	genpd->status = GPD_STATE_BUSY;
+	genpd->resume_count++;
+	for (;;) {
+		prepare_to_wait(&genpd->status_wait_queue, &wait,
+				TASK_UNINTERRUPTIBLE);
+		/*
+		 * If current is the powering off task, we have been called
+		 * reentrantly from one of the device callbacks, so we should
+		 * not wait.
+		 */
+		if (!genpd->poweroff_task || genpd->poweroff_task == current)
+			break;
+		mutex_unlock(&genpd->lock);
+
+		schedule();
+
+		mutex_lock(&genpd->lock);
+	}
+	finish_wait(&genpd->status_wait_queue, &wait);
+	__pm_genpd_runtime_resume(dev, genpd);
+	genpd->resume_count--;
+	genpd_set_active(genpd);
+	wake_up_all(&genpd->status_wait_queue);
+	mutex_unlock(&genpd->lock);
+
+	if (genpd->start_device)
+		genpd->start_device(dev);
+
+	return 0;
+}
+
+#else
+
+static inline void genpd_power_off_work_fn(struct work_struct *work) {}
+static inline void __pm_genpd_runtime_resume(struct device *dev,
+					     struct generic_pm_domain *genpd) {}
+
+#define pm_genpd_runtime_suspend	NULL
+#define pm_genpd_runtime_resume		NULL
+
+#endif /* CONFIG_PM_RUNTIME */
+
+#ifdef CONFIG_PM_SLEEP
+
+/**
+ * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents.
+ * @genpd: PM domain to power off, if possible.
+ *
+ * Check if the given PM domain can be powered off (during system suspend or
+ * hibernation) and do that if so.  Also, in that case propagate to its parent.
+ *
+ * This function is only called in "noirq" stages of system power transitions,
+ * so it need not acquire locks (all of the "noirq" callbacks are executed
+ * sequentially, so it is guaranteed that it will never run twice in parallel).
+ */
+static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)
+{
+	struct generic_pm_domain *parent = genpd->parent;
+
+	if (genpd->status == GPD_STATE_POWER_OFF)
+		return;
+
+	if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0)
+		return;
+
+	if (genpd->power_off)
+		genpd->power_off(genpd);
+
+	genpd->status = GPD_STATE_POWER_OFF;
+	if (parent) {
+		genpd_sd_counter_dec(parent);
+		pm_genpd_sync_poweroff(parent);
+	}
+}
+
+/**
+ * resume_needed - Check whether to resume a device before system suspend.
+ * @dev: Device to check.
+ * @genpd: PM domain the device belongs to.
+ *
+ * There are two cases in which a device that can wake up the system from sleep
+ * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
+ * to wake up the system and it has to remain active for this purpose while the
+ * system is in the sleep state and (2) if the device is not enabled to wake up
+ * the system from sleep states and it generally doesn't generate wakeup signals
+ * by itself (those signals are generated on its behalf by other parts of the
+ * system).  In the latter case it may be necessary to reconfigure the device's
+ * wakeup settings during system suspend, because it may have been set up to
+ * signal remote wakeup from the system's working state as needed by runtime PM.
+ * Return 'true' in either of the above cases.
+ */
+static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
+{
+	bool active_wakeup;
+
+	if (!device_can_wakeup(dev))
+		return false;
+
+	active_wakeup = genpd->active_wakeup && genpd->active_wakeup(dev);
+	return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
+}
+
+/**
+ * pm_genpd_prepare - Start power transition of a device in a PM domain.
+ * @dev: Device to start the transition of.
+ *
+ * Start a power transition of a device (during a system-wide power transition)
+ * under the assumption that its pm_domain field points to the domain member of
+ * an object of type struct generic_pm_domain representing a PM domain
+ * consisting of I/O devices.
+ */
+static int pm_genpd_prepare(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+	int ret;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	/*
+	 * If a wakeup request is pending for the device, it should be woken up
+	 * at this point and a system wakeup event should be reported if it's
+	 * set up to wake up the system from sleep states.
+	 */
+	pm_runtime_get_noresume(dev);
+	if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
+		pm_wakeup_event(dev, 0);
+
+	if (pm_wakeup_pending()) {
+		pm_runtime_put_sync(dev);
+		return -EBUSY;
+	}
+
+	if (resume_needed(dev, genpd))
+		pm_runtime_resume(dev);
+
+	genpd_acquire_lock(genpd);
+
+	if (genpd->prepared_count++ == 0)
+		genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
+
+	genpd_release_lock(genpd);
+
+	if (genpd->suspend_power_off) {
+		pm_runtime_put_noidle(dev);
+		return 0;
+	}
+
+	/*
+	 * The PM domain must be in the GPD_STATE_ACTIVE state at this point,
+	 * so pm_genpd_poweron() will return immediately, but if the device
+	 * is suspended (e.g. it's been stopped by .stop_device()), we need
+	 * to make it operational.
+	 */
+	pm_runtime_resume(dev);
+	__pm_runtime_disable(dev, false);
+
+	ret = pm_generic_prepare(dev);
+	if (ret) {
+		mutex_lock(&genpd->lock);
+
+		if (--genpd->prepared_count == 0)
+			genpd->suspend_power_off = false;
+
+		mutex_unlock(&genpd->lock);
+		pm_runtime_enable(dev);
+	}
+
+	pm_runtime_put_sync(dev);
+	return ret;
+}
+
+/**
+ * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
+ * @dev: Device to suspend.
+ *
+ * Suspend a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_suspend(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev);
+}
+
+/**
+ * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain.
+ * @dev: Device to suspend.
+ *
+ * Carry out a late suspend of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_suspend_noirq(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+	int ret;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	if (genpd->suspend_power_off)
+		return 0;
+
+	ret = pm_generic_suspend_noirq(dev);
+	if (ret)
+		return ret;
+
+	if (device_may_wakeup(dev)
+	    && genpd->active_wakeup && genpd->active_wakeup(dev))
+		return 0;
+
+	if (genpd->stop_device)
+		genpd->stop_device(dev);
+
+	/*
+	 * Since all of the "noirq" callbacks are executed sequentially, it is
+	 * guaranteed that this function will never run twice in parallel for
+	 * the same PM domain, so it is not necessary to use locking here.
+	 */
+	genpd->suspended_count++;
+	pm_genpd_sync_poweroff(genpd);
+
+	return 0;
+}
+
+/**
+ * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain.
+ * @dev: Device to resume.
+ *
+ * Carry out an early resume of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a power domain consisting of I/O
+ * devices.
+ */
+static int pm_genpd_resume_noirq(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	if (genpd->suspend_power_off)
+		return 0;
+
+	/*
+	 * Since all of the "noirq" callbacks are executed sequentially, it is
+	 * guaranteed that this function will never run twice in parallel for
+	 * the same PM domain, so it is not necessary to use locking here.
+	 */
+	pm_genpd_poweron(genpd);
+	genpd->suspended_count--;
+	if (genpd->start_device)
+		genpd->start_device(dev);
+
+	return pm_generic_resume_noirq(dev);
+}
+
+/**
+ * pm_genpd_resume - Resume a device belonging to an I/O power domain.
+ * @dev: Device to resume.
+ *
+ * Resume a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static int pm_genpd_resume(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	return genpd->suspend_power_off ? 0 : pm_generic_resume(dev);
+}
+
+/**
+ * pm_genpd_freeze - Freeze a device belonging to an I/O power domain.
+ * @dev: Device to freeze.
+ *
+ * Freeze a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static int pm_genpd_freeze(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev);
+}
+
+/**
+ * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain.
+ * @dev: Device to freeze.
+ *
+ * Carry out a late freeze of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a power domain consisting of I/O
+ * devices.
+ */
+static int pm_genpd_freeze_noirq(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+	int ret;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	if (genpd->suspend_power_off)
+		return 0;
+
+	ret = pm_generic_freeze_noirq(dev);
+	if (ret)
+		return ret;
+
+	if (genpd->stop_device)
+		genpd->stop_device(dev);
+
+	return 0;
+}
+
+/**
+ * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain.
+ * @dev: Device to thaw.
+ *
+ * Carry out an early thaw of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a power domain consisting of I/O
+ * devices.
+ */
+static int pm_genpd_thaw_noirq(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	if (genpd->suspend_power_off)
+		return 0;
+
+	if (genpd->start_device)
+		genpd->start_device(dev);
+
+	return pm_generic_thaw_noirq(dev);
+}
+
+/**
+ * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
+ * @dev: Device to thaw.
+ *
+ * Thaw a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static int pm_genpd_thaw(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev);
+}
+
+/**
+ * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain.
+ * @dev: Device to suspend.
+ *
+ * Power off a device under the assumption that its pm_domain field points to
+ * the domain member of an object of type struct generic_pm_domain representing
+ * a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_dev_poweroff(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev);
+}
+
+/**
+ * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain.
+ * @dev: Device to suspend.
+ *
+ * Carry out a late powering off of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_dev_poweroff_noirq(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+	int ret;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	if (genpd->suspend_power_off)
+		return 0;
+
+	ret = pm_generic_poweroff_noirq(dev);
+	if (ret)
+		return ret;
+
+	if (device_may_wakeup(dev)
+	    && genpd->active_wakeup && genpd->active_wakeup(dev))
+		return 0;
+
+	if (genpd->stop_device)
+		genpd->stop_device(dev);
+
+	/*
+	 * Since all of the "noirq" callbacks are executed sequentially, it is
+	 * guaranteed that this function will never run twice in parallel for
+	 * the same PM domain, so it is not necessary to use locking here.
+	 */
+	genpd->suspended_count++;
+	pm_genpd_sync_poweroff(genpd);
+
+	return 0;
+}
+
+/**
+ * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain.
+ * @dev: Device to resume.
+ *
+ * Carry out an early restore of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a power domain consisting of I/O
+ * devices.
+ */
+static int pm_genpd_restore_noirq(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	/*
+	 * Since all of the "noirq" callbacks are executed sequentially, it is
+	 * guaranteed that this function will never run twice in parallel for
+	 * the same PM domain, so it is not necessary to use locking here.
+	 */
+	genpd->status = GPD_STATE_POWER_OFF;
+	if (genpd->suspend_power_off) {
+		/*
+		 * The boot kernel might put the domain into the power on state,
+		 * so make sure it really is powered off.
+		 */
+		if (genpd->power_off)
+			genpd->power_off(genpd);
+		return 0;
+	}
+
+	pm_genpd_poweron(genpd);
+	genpd->suspended_count--;
+	if (genpd->start_device)
+		genpd->start_device(dev);
+
+	return pm_generic_restore_noirq(dev);
+}
+
+/**
+ * pm_genpd_restore - Restore a device belonging to an I/O power domain.
+ * @dev: Device to resume.
+ *
+ * Restore a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static int pm_genpd_restore(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -EINVAL;
+
+	return genpd->suspend_power_off ? 0 : pm_generic_restore(dev);
+}
+
+/**
+ * pm_genpd_complete - Complete power transition of a device in a power domain.
+ * @dev: Device to complete the transition of.
+ *
+ * Complete a power transition of a device (during a system-wide power
+ * transition) under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static void pm_genpd_complete(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+	bool run_complete;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return;
+
+	mutex_lock(&genpd->lock);
+
+	run_complete = !genpd->suspend_power_off;
+	if (--genpd->prepared_count == 0)
+		genpd->suspend_power_off = false;
+
+	mutex_unlock(&genpd->lock);
+
+	if (run_complete) {
+		pm_generic_complete(dev);
+		pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
+		pm_runtime_idle(dev);
+	}
+}
+
+#else
+
+#define pm_genpd_prepare		NULL
+#define pm_genpd_suspend		NULL
+#define pm_genpd_suspend_noirq		NULL
+#define pm_genpd_resume_noirq		NULL
+#define pm_genpd_resume			NULL
+#define pm_genpd_freeze			NULL
+#define pm_genpd_freeze_noirq		NULL
+#define pm_genpd_thaw_noirq		NULL
+#define pm_genpd_thaw			NULL
+#define pm_genpd_dev_poweroff_noirq	NULL
+#define pm_genpd_dev_poweroff		NULL
+#define pm_genpd_restore_noirq		NULL
+#define pm_genpd_restore		NULL
+#define pm_genpd_complete		NULL
+
+#endif /* CONFIG_PM_SLEEP */
+
+/**
+ * pm_genpd_add_device - Add a device to an I/O PM domain.
+ * @genpd: PM domain to add the device to.
+ * @dev: Device to be added.
+ */
+int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
+{
+	struct dev_list_entry *dle;
+	int ret = 0;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
+		return -EINVAL;
+
+	genpd_acquire_lock(genpd);
+
+	if (genpd->status == GPD_STATE_POWER_OFF) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (genpd->prepared_count > 0) {
+		ret = -EAGAIN;
+		goto out;
+	}
+
+	list_for_each_entry(dle, &genpd->dev_list, node)
+		if (dle->dev == dev) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+	dle = kzalloc(sizeof(*dle), GFP_KERNEL);
+	if (!dle) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	dle->dev = dev;
+	dle->need_restore = false;
+	list_add_tail(&dle->node, &genpd->dev_list);
+	genpd->device_count++;
+
+	spin_lock_irq(&dev->power.lock);
+	dev->pm_domain = &genpd->domain;
+	spin_unlock_irq(&dev->power.lock);
+
+ out:
+	genpd_release_lock(genpd);
+
+	return ret;
+}
+
+/**
+ * pm_genpd_remove_device - Remove a device from an I/O PM domain.
+ * @genpd: PM domain to remove the device from.
+ * @dev: Device to be removed.
+ */
+int pm_genpd_remove_device(struct generic_pm_domain *genpd,
+			   struct device *dev)
+{
+	struct dev_list_entry *dle;
+	int ret = -EINVAL;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
+		return -EINVAL;
+
+	genpd_acquire_lock(genpd);
+
+	if (genpd->prepared_count > 0) {
+		ret = -EAGAIN;
+		goto out;
+	}
+
+	list_for_each_entry(dle, &genpd->dev_list, node) {
+		if (dle->dev != dev)
+			continue;
+
+		spin_lock_irq(&dev->power.lock);
+		dev->pm_domain = NULL;
+		spin_unlock_irq(&dev->power.lock);
+
+		genpd->device_count--;
+		list_del(&dle->node);
+		kfree(dle);
+
+		ret = 0;
+		break;
+	}
+
+ out:
+	genpd_release_lock(genpd);
+
+	return ret;
+}
+
+/**
+ * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
+ * @genpd: Master PM domain to add the subdomain to.
+ * @new_subdomain: Subdomain to be added.
+ */
+int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
+			   struct generic_pm_domain *new_subdomain)
+{
+	struct generic_pm_domain *subdomain;
+	int ret = 0;
+
+	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain))
+		return -EINVAL;
+
+ start:
+	genpd_acquire_lock(genpd);
+	mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING);
+
+	if (new_subdomain->status != GPD_STATE_POWER_OFF
+	    && new_subdomain->status != GPD_STATE_ACTIVE) {
+		mutex_unlock(&new_subdomain->lock);
+		genpd_release_lock(genpd);
+		goto start;
+	}
+
+	if (genpd->status == GPD_STATE_POWER_OFF
+	    &&  new_subdomain->status != GPD_STATE_POWER_OFF) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	list_for_each_entry(subdomain, &genpd->sd_list, sd_node) {
+		if (subdomain == new_subdomain) {
+			ret = -EINVAL;
+			goto out;
+		}
+	}
+
+	list_add_tail(&new_subdomain->sd_node, &genpd->sd_list);
+	new_subdomain->parent = genpd;
+	if (subdomain->status != GPD_STATE_POWER_OFF)
+		genpd->sd_count++;
+
+ out:
+	mutex_unlock(&new_subdomain->lock);
+	genpd_release_lock(genpd);
+
+	return ret;
+}
+
+/**
+ * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
+ * @genpd: Master PM domain to remove the subdomain from.
+ * @target: Subdomain to be removed.
+ */
+int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
+			      struct generic_pm_domain *target)
+{
+	struct generic_pm_domain *subdomain;
+	int ret = -EINVAL;
+
+	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target))
+		return -EINVAL;
+
+ start:
+	genpd_acquire_lock(genpd);
+
+	list_for_each_entry(subdomain, &genpd->sd_list, sd_node) {
+		if (subdomain != target)
+			continue;
+
+		mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
+
+		if (subdomain->status != GPD_STATE_POWER_OFF
+		    && subdomain->status != GPD_STATE_ACTIVE) {
+			mutex_unlock(&subdomain->lock);
+			genpd_release_lock(genpd);
+			goto start;
+		}
+
+		list_del(&subdomain->sd_node);
+		subdomain->parent = NULL;
+		if (subdomain->status != GPD_STATE_POWER_OFF)
+			genpd_sd_counter_dec(genpd);
+
+		mutex_unlock(&subdomain->lock);
+
+		ret = 0;
+		break;
+	}
+
+	genpd_release_lock(genpd);
+
+	return ret;
+}
+
+/**
+ * pm_genpd_init - Initialize a generic I/O PM domain object.
+ * @genpd: PM domain object to initialize.
+ * @gov: PM domain governor to associate with the domain (may be NULL).
+ * @is_off: Initial value of the domain's power_is_off field.
+ */
+void pm_genpd_init(struct generic_pm_domain *genpd,
+		   struct dev_power_governor *gov, bool is_off)
+{
+	if (IS_ERR_OR_NULL(genpd))
+		return;
+
+	INIT_LIST_HEAD(&genpd->sd_node);
+	genpd->parent = NULL;
+	INIT_LIST_HEAD(&genpd->dev_list);
+	INIT_LIST_HEAD(&genpd->sd_list);
+	mutex_init(&genpd->lock);
+	genpd->gov = gov;
+	INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
+	genpd->in_progress = 0;
+	genpd->sd_count = 0;
+	genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
+	init_waitqueue_head(&genpd->status_wait_queue);
+	genpd->poweroff_task = NULL;
+	genpd->resume_count = 0;
+	genpd->device_count = 0;
+	genpd->suspended_count = 0;
+	genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
+	genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
+	genpd->domain.ops.runtime_idle = pm_generic_runtime_idle;
+	genpd->domain.ops.prepare = pm_genpd_prepare;
+	genpd->domain.ops.suspend = pm_genpd_suspend;
+	genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
+	genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
+	genpd->domain.ops.resume = pm_genpd_resume;
+	genpd->domain.ops.freeze = pm_genpd_freeze;
+	genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
+	genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
+	genpd->domain.ops.thaw = pm_genpd_thaw;
+	genpd->domain.ops.poweroff = pm_genpd_dev_poweroff;
+	genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq;
+	genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
+	genpd->domain.ops.restore = pm_genpd_restore;
+	genpd->domain.ops.complete = pm_genpd_complete;
+	mutex_lock(&gpd_list_lock);
+	list_add(&genpd->gpd_list_node, &gpd_list);
+	mutex_unlock(&gpd_list_lock);
+}
+
+/**
+ * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use.
+ */
+void pm_genpd_poweroff_unused(void)
+{
+	struct generic_pm_domain *genpd;
+
+	mutex_lock(&gpd_list_lock);
+
+	list_for_each_entry(genpd, &gpd_list, gpd_list_node)
+		genpd_queue_power_off_work(genpd);
+
+	mutex_unlock(&gpd_list_lock);
+}

drivers/base/power/generic_ops.c

@@ -94,12 +94,13 @@ int pm_generic_prepare(struct device *dev)
  * __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
  * @dev: Device to handle.
  * @event: PM transition of the system under way.
+ * @bool: Whether or not this is the "noirq" stage.
  *
  * If the device has not been suspended at run time, execute the
  * suspend/freeze/poweroff/thaw callback provided by its driver, if defined, and
  * return its error code.  Otherwise, return zero.
  */
-static int __pm_generic_call(struct device *dev, int event)
+static int __pm_generic_call(struct device *dev, int event, bool noirq)
 {
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int (*callback)(struct device *);
@@ -109,16 +110,16 @@ static int __pm_generic_call(struct device *dev, int event)
 
 	switch (event) {
 	case PM_EVENT_SUSPEND:
-		callback = pm->suspend;
+		callback = noirq ? pm->suspend_noirq : pm->suspend;
 		break;
 	case PM_EVENT_FREEZE:
-		callback = pm->freeze;
+		callback = noirq ? pm->freeze_noirq : pm->freeze;
 		break;
 	case PM_EVENT_HIBERNATE:
-		callback = pm->poweroff;
+		callback = noirq ? pm->poweroff_noirq : pm->poweroff;
 		break;
 	case PM_EVENT_THAW:
-		callback = pm->thaw;
+		callback = noirq ? pm->thaw_noirq : pm->thaw;
 		break;
 	default:
 		callback = NULL;
@@ -128,43 +129,83 @@ static int __pm_generic_call(struct device *dev, int event)
 	return callback ? callback(dev) : 0;
 }
 
+/**
+ * pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems.
+ * @dev: Device to suspend.
+ */
+int pm_generic_suspend_noirq(struct device *dev)
+{
+	return __pm_generic_call(dev, PM_EVENT_SUSPEND, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq);
+
 /**
  * pm_generic_suspend - Generic suspend callback for subsystems.
  * @dev: Device to suspend.
  */
 int pm_generic_suspend(struct device *dev)
 {
-	return __pm_generic_call(dev, PM_EVENT_SUSPEND);
+	return __pm_generic_call(dev, PM_EVENT_SUSPEND, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_suspend);
 
+/**
+ * pm_generic_freeze_noirq - Generic freeze_noirq callback for subsystems.
+ * @dev: Device to freeze.
+ */
+int pm_generic_freeze_noirq(struct device *dev)
+{
+	return __pm_generic_call(dev, PM_EVENT_FREEZE, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq);
+
 /**
  * pm_generic_freeze - Generic freeze callback for subsystems.
  * @dev: Device to freeze.
  */
 int pm_generic_freeze(struct device *dev)
 {
-	return __pm_generic_call(dev, PM_EVENT_FREEZE);
+	return __pm_generic_call(dev, PM_EVENT_FREEZE, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_freeze);
 
+/**
+ * pm_generic_poweroff_noirq - Generic poweroff_noirq callback for subsystems.
+ * @dev: Device to handle.
+ */
+int pm_generic_poweroff_noirq(struct device *dev)
+{
+	return __pm_generic_call(dev, PM_EVENT_HIBERNATE, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq);
+
 /**
  * pm_generic_poweroff - Generic poweroff callback for subsystems.
  * @dev: Device to handle.
  */
 int pm_generic_poweroff(struct device *dev)
 {
-	return __pm_generic_call(dev, PM_EVENT_HIBERNATE);
+	return __pm_generic_call(dev, PM_EVENT_HIBERNATE, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_poweroff);
 
+/**
+ * pm_generic_thaw_noirq - Generic thaw_noirq callback for subsystems.
+ * @dev: Device to thaw.
+ */
+int pm_generic_thaw_noirq(struct device *dev)
+{
+	return __pm_generic_call(dev, PM_EVENT_THAW, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq);
+
 /**
  * pm_generic_thaw - Generic thaw callback for subsystems.
  * @dev: Device to thaw.
  */
 int pm_generic_thaw(struct device *dev)
 {
-	return __pm_generic_call(dev, PM_EVENT_THAW);
+	return __pm_generic_call(dev, PM_EVENT_THAW, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_thaw);
 
@@ -172,12 +213,13 @@ EXPORT_SYMBOL_GPL(pm_generic_thaw);
  * __pm_generic_resume - Generic resume/restore callback for subsystems.
  * @dev: Device to handle.
  * @event: PM transition of the system under way.
+ * @bool: Whether or not this is the "noirq" stage.
  *
  * Execute the resume/resotre callback provided by the @dev's driver, if
  * defined.  If it returns 0, change the device's runtime PM status to 'active'.
  * Return the callback's error code.
  */
-static int __pm_generic_resume(struct device *dev, int event)
+static int __pm_generic_resume(struct device *dev, int event, bool noirq)
 {
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int (*callback)(struct device *);
@@ -188,10 +230,10 @@ static int __pm_generic_resume(struct device *dev, int event)
 
 	switch (event) {
 	case PM_EVENT_RESUME:
-		callback = pm->resume;
+		callback = noirq ? pm->resume_noirq : pm->resume;
 		break;
 	case PM_EVENT_RESTORE:
-		callback = pm->restore;
+		callback = noirq ? pm->restore_noirq : pm->restore;
 		break;
 	default:
 		callback = NULL;
@@ -202,7 +244,7 @@ static int __pm_generic_resume(struct device *dev, int event)
 		return 0;
 
 	ret = callback(dev);
-	if (!ret && pm_runtime_enabled(dev)) {
+	if (!ret && !noirq && pm_runtime_enabled(dev)) {
 		pm_runtime_disable(dev);
 		pm_runtime_set_active(dev);
 		pm_runtime_enable(dev);
@@ -211,23 +253,43 @@ static int __pm_generic_resume(struct device *dev, int event)
 	return ret;
 }
 
+/**
+ * pm_generic_resume_noirq - Generic resume_noirq callback for subsystems.
+ * @dev: Device to resume.
+ */
+int pm_generic_resume_noirq(struct device *dev)
+{
+	return __pm_generic_resume(dev, PM_EVENT_RESUME, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_resume_noirq);
+
 /**
  * pm_generic_resume - Generic resume callback for subsystems.
  * @dev: Device to resume.
  */
 int pm_generic_resume(struct device *dev)
 {
-	return __pm_generic_resume(dev, PM_EVENT_RESUME);
+	return __pm_generic_resume(dev, PM_EVENT_RESUME, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_resume);
 
+/**
+ * pm_generic_restore_noirq - Generic restore_noirq callback for subsystems.
+ * @dev: Device to restore.
+ */
+int pm_generic_restore_noirq(struct device *dev)
+{
+	return __pm_generic_resume(dev, PM_EVENT_RESTORE, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_restore_noirq);
+
 /**
  * pm_generic_restore - Generic restore callback for subsystems.
  * @dev: Device to restore.
  */
 int pm_generic_restore(struct device *dev)
 {
-	return __pm_generic_resume(dev, PM_EVENT_RESTORE);
+	return __pm_generic_resume(dev, PM_EVENT_RESTORE, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_restore);
 
@@ -256,11 +318,17 @@ struct dev_pm_ops generic_subsys_pm_ops = {
 #ifdef CONFIG_PM_SLEEP
 	.prepare = pm_generic_prepare,
 	.suspend = pm_generic_suspend,
+	.suspend_noirq = pm_generic_suspend_noirq,
 	.resume = pm_generic_resume,
+	.resume_noirq = pm_generic_resume_noirq,
 	.freeze = pm_generic_freeze,
+	.freeze_noirq = pm_generic_freeze_noirq,
 	.thaw = pm_generic_thaw,
+	.thaw_noirq = pm_generic_thaw_noirq,
 	.poweroff = pm_generic_poweroff,
+	.poweroff_noirq = pm_generic_poweroff_noirq,
 	.restore = pm_generic_restore,
+	.restore_noirq = pm_generic_restore_noirq,
 	.complete = pm_generic_complete,
 #endif
 #ifdef CONFIG_PM_RUNTIME

drivers/base/power/main.c

@@ -425,9 +425,9 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
 	TRACE_DEVICE(dev);
 	TRACE_RESUME(0);
 
-	if (dev->pwr_domain) {
+	if (dev->pm_domain) {
 		pm_dev_dbg(dev, state, "EARLY power domain ");
-		error = pm_noirq_op(dev, &dev->pwr_domain->ops, state);
+		error = pm_noirq_op(dev, &dev->pm_domain->ops, state);
 	} else if (dev->type && dev->type->pm) {
 		pm_dev_dbg(dev, state, "EARLY type ");
 		error = pm_noirq_op(dev, dev->type->pm, state);
@@ -521,9 +521,9 @@ static int device_resume(struct device *dev, pm_message_t state, bool async)
 	if (!dev->power.is_suspended)
 		goto Unlock;
 
-	if (dev->pwr_domain) {
+	if (dev->pm_domain) {
 		pm_dev_dbg(dev, state, "power domain ");
-		error = pm_op(dev, &dev->pwr_domain->ops, state);
+		error = pm_op(dev, &dev->pm_domain->ops, state);
 		goto End;
 	}
 
@@ -641,10 +641,10 @@ static void device_complete(struct device *dev, pm_message_t state)
 {
 	device_lock(dev);
 
-	if (dev->pwr_domain) {
+	if (dev->pm_domain) {
 		pm_dev_dbg(dev, state, "completing power domain ");
-		if (dev->pwr_domain->ops.complete)
-			dev->pwr_domain->ops.complete(dev);
+		if (dev->pm_domain->ops.complete)
+			dev->pm_domain->ops.complete(dev);
 	} else if (dev->type && dev->type->pm) {
 		pm_dev_dbg(dev, state, "completing type ");
 		if (dev->type->pm->complete)
@@ -744,9 +744,9 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
 {
 	int error;
 
-	if (dev->pwr_domain) {
+	if (dev->pm_domain) {
 		pm_dev_dbg(dev, state, "LATE power domain ");
-		error = pm_noirq_op(dev, &dev->pwr_domain->ops, state);
+		error = pm_noirq_op(dev, &dev->pm_domain->ops, state);
 		if (error)
 			return error;
 	} else if (dev->type && dev->type->pm) {
@@ -853,9 +853,9 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 		goto Unlock;
 	}
 
-	if (dev->pwr_domain) {
+	if (dev->pm_domain) {
 		pm_dev_dbg(dev, state, "power domain ");
-		error = pm_op(dev, &dev->pwr_domain->ops, state);
+		error = pm_op(dev, &dev->pm_domain->ops, state);
 		goto End;
 	}
 
@@ -982,11 +982,11 @@ static int device_prepare(struct device *dev, pm_message_t state)
 
 	device_lock(dev);
 
-	if (dev->pwr_domain) {
+	if (dev->pm_domain) {
 		pm_dev_dbg(dev, state, "preparing power domain ");
-		if (dev->pwr_domain->ops.prepare)
-			error = dev->pwr_domain->ops.prepare(dev);
-		suspend_report_result(dev->pwr_domain->ops.prepare, error);
+		if (dev->pm_domain->ops.prepare)
+			error = dev->pm_domain->ops.prepare(dev);
+		suspend_report_result(dev->pm_domain->ops.prepare, error);
 		if (error)
 			goto End;
 	} else if (dev->type && dev->type->pm) {

drivers/base/power/runtime.c

@@ -213,8 +213,8 @@ static int rpm_idle(struct device *dev, int rpmflags)
 
 	dev->power.idle_notification = true;
 
-	if (dev->pwr_domain)
-		callback = dev->pwr_domain->ops.runtime_idle;
+	if (dev->pm_domain)
+		callback = dev->pm_domain->ops.runtime_idle;
 	else if (dev->type && dev->type->pm)
 		callback = dev->type->pm->runtime_idle;
 	else if (dev->class && dev->class->pm)
@@ -374,8 +374,8 @@ static int rpm_suspend(struct device *dev, int rpmflags)
 
 	__update_runtime_status(dev, RPM_SUSPENDING);
 
-	if (dev->pwr_domain)
-		callback = dev->pwr_domain->ops.runtime_suspend;
+	if (dev->pm_domain)
+		callback = dev->pm_domain->ops.runtime_suspend;
 	else if (dev->type && dev->type->pm)
 		callback = dev->type->pm->runtime_suspend;
 	else if (dev->class && dev->class->pm)
@@ -573,8 +573,8 @@ static int rpm_resume(struct device *dev, int rpmflags)
 
 	__update_runtime_status(dev, RPM_RESUMING);
 
-	if (dev->pwr_domain)
-		callback = dev->pwr_domain->ops.runtime_resume;
+	if (dev->pm_domain)
+		callback = dev->pm_domain->ops.runtime_resume;
 	else if (dev->type && dev->type->pm)
 		callback = dev->type->pm->runtime_resume;
 	else if (dev->class && dev->class->pm)

include/linux/device.h

@@ -516,7 +516,7 @@ struct device_dma_parameters {
  * 		minimizes board-specific #ifdefs in drivers.
  * @power:	For device power management.
  * 		See Documentation/power/devices.txt for details.
- * @pwr_domain:	Provide callbacks that are executed during system suspend,
+ * @pm_domain:	Provide callbacks that are executed during system suspend,
  * 		hibernation, system resume and during runtime PM transitions
  * 		along with subsystem-level and driver-level callbacks.
  * @numa_node:	NUMA node this device is close to.
@@ -567,7 +567,7 @@ struct device {
 	void		*platform_data;	/* Platform specific data, device
 					   core doesn't touch it */
 	struct dev_pm_info	power;
-	struct dev_power_domain	*pwr_domain;
+	struct dev_pm_domain	*pm_domain;
 
 #ifdef CONFIG_NUMA
 	int		numa_node;	/* NUMA node this device is close to */

include/linux/pm.h

@@ -461,8 +461,8 @@ struct dev_pm_info {
 	unsigned long		active_jiffies;
 	unsigned long		suspended_jiffies;
 	unsigned long		accounting_timestamp;
-	void			*subsys_data;  /* Owned by the subsystem. */
 #endif
+	void			*subsys_data;  /* Owned by the subsystem. */
 };
 
 extern void update_pm_runtime_accounting(struct device *dev);
@@ -472,7 +472,7 @@ extern void update_pm_runtime_accounting(struct device *dev);
  * hibernation, system resume and during runtime PM transitions along with
  * subsystem-level and driver-level callbacks.
  */
-struct dev_power_domain {
+struct dev_pm_domain {
 	struct dev_pm_ops	ops;
 };
 
@@ -553,11 +553,17 @@ extern void __suspend_report_result(const char *function, void *fn, int ret);
 extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
 
 extern int pm_generic_prepare(struct device *dev);
+extern int pm_generic_suspend_noirq(struct device *dev);
 extern int pm_generic_suspend(struct device *dev);
+extern int pm_generic_resume_noirq(struct device *dev);
 extern int pm_generic_resume(struct device *dev);
+extern int pm_generic_freeze_noirq(struct device *dev);
 extern int pm_generic_freeze(struct device *dev);
+extern int pm_generic_thaw_noirq(struct device *dev);
 extern int pm_generic_thaw(struct device *dev);
+extern int pm_generic_restore_noirq(struct device *dev);
 extern int pm_generic_restore(struct device *dev);
+extern int pm_generic_poweroff_noirq(struct device *dev);
 extern int pm_generic_poweroff(struct device *dev);
 extern void pm_generic_complete(struct device *dev);
 

include/linux/pm_domain.h

@@ -0,0 +1,108 @@
+/*
+ * pm_domain.h - Definitions and headers related to device power domains.
+ *
+ * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#ifndef _LINUX_PM_DOMAIN_H
+#define _LINUX_PM_DOMAIN_H
+
+#include <linux/device.h>
+
+enum gpd_status {
+	GPD_STATE_ACTIVE = 0,	/* PM domain is active */
+	GPD_STATE_BUSY,		/* Something is happening to the PM domain */
+	GPD_STATE_REPEAT,	/* Power off in progress, to be repeated */
+	GPD_STATE_POWER_OFF,	/* PM domain is off */
+};
+
+struct dev_power_governor {
+	bool (*power_down_ok)(struct dev_pm_domain *domain);
+};
+
+struct generic_pm_domain {
+	struct dev_pm_domain domain;	/* PM domain operations */
+	struct list_head gpd_list_node;	/* Node in the global PM domains list */
+	struct list_head sd_node;	/* Node in the parent's subdomain list */
+	struct generic_pm_domain *parent;	/* Parent PM domain */
+	struct list_head sd_list;	/* List of dubdomains */
+	struct list_head dev_list;	/* List of devices */
+	struct mutex lock;
+	struct dev_power_governor *gov;
+	struct work_struct power_off_work;
+	unsigned int in_progress;	/* Number of devices being suspended now */
+	unsigned int sd_count;	/* Number of subdomains with power "on" */
+	enum gpd_status status;	/* Current state of the domain */
+	wait_queue_head_t status_wait_queue;
+	struct task_struct *poweroff_task;	/* Powering off task */
+	unsigned int resume_count;	/* Number of devices being resumed */
+	unsigned int device_count;	/* Number of devices */
+	unsigned int suspended_count;	/* System suspend device counter */
+	unsigned int prepared_count;	/* Suspend counter of prepared devices */
+	bool suspend_power_off;	/* Power status before system suspend */
+	int (*power_off)(struct generic_pm_domain *domain);
+	int (*power_on)(struct generic_pm_domain *domain);
+	int (*start_device)(struct device *dev);
+	int (*stop_device)(struct device *dev);
+	bool (*active_wakeup)(struct device *dev);
+};
+
+static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
+{
+	return container_of(pd, struct generic_pm_domain, domain);
+}
+
+struct dev_list_entry {
+	struct list_head node;
+	struct device *dev;
+	bool need_restore;
+};
+
+#ifdef CONFIG_PM_GENERIC_DOMAINS
+extern int pm_genpd_add_device(struct generic_pm_domain *genpd,
+			       struct device *dev);
+extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
+				  struct device *dev);
+extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
+				  struct generic_pm_domain *new_subdomain);
+extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
+				     struct generic_pm_domain *target);
+extern void pm_genpd_init(struct generic_pm_domain *genpd,
+			  struct dev_power_governor *gov, bool is_off);
+extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
+extern void pm_genpd_poweroff_unused(void);
+extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
+#else
+static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
+				      struct device *dev)
+{
+	return -ENOSYS;
+}
+static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
+					 struct device *dev)
+{
+	return -ENOSYS;
+}
+static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
+					 struct generic_pm_domain *new_sd)
+{
+	return -ENOSYS;
+}
+static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
+					    struct generic_pm_domain *target)
+{
+	return -ENOSYS;
+}
+static inline void pm_genpd_init(struct generic_pm_domain *genpd,
+				 struct dev_power_governor *gov, bool is_off) {}
+static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
+{
+	return -ENOSYS;
+}
+static inline void pm_genpd_poweroff_unused(void) {}
+static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
+#endif
+
+#endif /* _LINUX_PM_DOMAIN_H */

include/linux/pm_runtime.h

@@ -247,41 +247,41 @@ static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
 
 struct pm_clk_notifier_block {
 	struct notifier_block nb;
-	struct dev_power_domain *pwr_domain;
+	struct dev_pm_domain *pm_domain;
 	char *con_ids[];
 };
 
-#ifdef CONFIG_PM_RUNTIME_CLK
-extern int pm_runtime_clk_init(struct device *dev);
-extern void pm_runtime_clk_destroy(struct device *dev);
-extern int pm_runtime_clk_add(struct device *dev, const char *con_id);
-extern void pm_runtime_clk_remove(struct device *dev, const char *con_id);
-extern int pm_runtime_clk_suspend(struct device *dev);
-extern int pm_runtime_clk_resume(struct device *dev);
+#ifdef CONFIG_PM_CLK
+extern int pm_clk_init(struct device *dev);
+extern void pm_clk_destroy(struct device *dev);
+extern int pm_clk_add(struct device *dev, const char *con_id);
+extern void pm_clk_remove(struct device *dev, const char *con_id);
+extern int pm_clk_suspend(struct device *dev);
+extern int pm_clk_resume(struct device *dev);
 #else
-static inline int pm_runtime_clk_init(struct device *dev)
+static inline int pm_clk_init(struct device *dev)
 {
 	return -EINVAL;
 }
-static inline void pm_runtime_clk_destroy(struct device *dev)
+static inline void pm_clk_destroy(struct device *dev)
 {
 }
-static inline int pm_runtime_clk_add(struct device *dev, const char *con_id)
+static inline int pm_clk_add(struct device *dev, const char *con_id)
 {
 	return -EINVAL;
 }
-static inline void pm_runtime_clk_remove(struct device *dev, const char *con_id)
+static inline void pm_clk_remove(struct device *dev, const char *con_id)
 {
 }
-#define pm_runtime_clock_suspend	NULL
-#define pm_runtime_clock_resume		NULL
+#define pm_clk_suspend	NULL
+#define pm_clk_resume	NULL
 #endif
 
 #ifdef CONFIG_HAVE_CLK
-extern void pm_runtime_clk_add_notifier(struct bus_type *bus,
+extern void pm_clk_add_notifier(struct bus_type *bus,
 					struct pm_clk_notifier_block *clknb);
 #else
-static inline void pm_runtime_clk_add_notifier(struct bus_type *bus,
+static inline void pm_clk_add_notifier(struct bus_type *bus,
 					struct pm_clk_notifier_block *clknb)
 {
 }

kernel/power/Kconfig

@@ -224,6 +224,10 @@ config PM_OPP
 	  implementations a ready to use framework to manage OPPs.
 	  For more information, read <file:Documentation/power/opp.txt>
 
-config PM_RUNTIME_CLK
+config PM_CLK
 	def_bool y
-	depends on PM_RUNTIME && HAVE_CLK
+	depends on PM && HAVE_CLK
+
+config PM_GENERIC_DOMAINS
+	bool
+	depends on PM