ARM / shmobile: Make A3RV be a subdomain of A4LC on SH7372

Instead of coding the undocumented dependencies between power domains
A3RV and A4LC on SH7372 directly into the low-level power up/down
routines, make A3RV be a subdomain of A4LC, which will cause the
same dependecies to hold.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>

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

@@ -494,9 +494,12 @@ 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);
+extern void sh7372_pm_add_subdomain(struct sh7372_pm_domain *sh7372_pd,
+				    struct sh7372_pm_domain *sh7372_sd);
 #else
 #define sh7372_init_pm_domain(pd) do { } while(0)
 #define sh7372_add_device_to_domain(pd, pdev) do { } while(0)
+#define sh7372_pm_add_subdomain(pd, sd) do { } while(0)
 #endif /* CONFIG_PM */
 
 #endif /* __ASM_SH7372_H__ */

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

@@ -91,35 +91,6 @@ static int pd_power_up(struct generic_pm_domain *genpd)
 	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;
@@ -133,17 +104,8 @@ void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd)
 	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_off = pd_power_down;
+	genpd->power_on = pd_power_up;
 	genpd->power_on(&sh7372_pd->genpd);
 }
 
@@ -159,6 +121,12 @@ void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
 	pm_genpd_add_device(&sh7372_pd->genpd, dev);
 }
 
+void sh7372_pm_add_subdomain(struct sh7372_pm_domain *sh7372_pd,
+			     struct sh7372_pm_domain *sh7372_sd)
+{
+	pm_genpd_add_subdomain(&sh7372_pd->genpd, &sh7372_sd->genpd);
+}
+
 struct sh7372_pm_domain sh7372_a4lc = {
 	.bit_shift = 1,
 };

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

@@ -30,6 +30,7 @@
 #include <linux/sh_dma.h>
 #include <linux/sh_intc.h>
 #include <linux/sh_timer.h>
+#include <linux/pm_domain.h>
 #include <mach/hardware.h>
 #include <mach/sh7372.h>
 #include <asm/mach-types.h>
@@ -848,6 +849,8 @@ void __init sh7372_add_standard_devices(void)
 	sh7372_init_pm_domain(&sh7372_a3ri);
 	sh7372_init_pm_domain(&sh7372_a3sg);
 
+	sh7372_pm_add_subdomain(&sh7372_a4lc, &sh7372_a3rv);
+
 	platform_add_devices(sh7372_early_devices,
 			    ARRAY_SIZE(sh7372_early_devices));