ARM: mx53: Allow suspend/resume

Current imx53_pm_init() implementation is incomplete as it lacks calling
suspend_set_ops().

Use a single imx5_pm_init() function to handle both mx51 and mx53.

This allows mx53 to enter in low-power mode.

Tested on a mx53qsb:

root@freescale /$ echo mem > /sys/power/state
PM: Syncing filesystems ... done.
mmc0: card e624 removed
Freezing user space processes ... (elapsed 0.001 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Suspending console(s) (use no_console_suspend to debug)

... (Press Power button)

PM: suspend of devices complete after 17.067 msecs
PM: suspend devices took 0.020 seconds
PM: late suspend of devices complete after 0.954 msecs
PM: noirq suspend of devices complete after 1.288 msecs
Disabling non-boot CPUs ...
PM: noirq resume of devices complete after 0.680 msecs
PM: early resume of devices complete after 0.914 msecs
PM: resume of devices complete after 44.955 msecs
PM: resume devices took 0.050 seconds
Restarting tasks ... done.
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SDHC card at address e624
mmcblk0: mmc0:e624 SU04G 3.69 GiB
 mmcblk0: p1 p2 p3
libphy: 63fec000.etherne:00 - Link is Down
libphy: 63fec000.etherne:00 - Link is Up - 100/Full
root@freescale /$

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/common.h

@@ -147,12 +147,10 @@ extern int imx_cpu_kill(unsigned int cpu);
 
 #ifdef CONFIG_PM
 extern void imx6q_pm_init(void);
-extern void imx51_pm_init(void);
-extern void imx53_pm_init(void);
+extern void imx5_pm_init(void);
 #else
 static inline void imx6q_pm_init(void) {}
-static inline void imx51_pm_init(void) {}
-static inline void imx53_pm_init(void) {}
+static inline void imx5_pm_init(void) {}
 #endif
 
 #ifdef CONFIG_NEON

arch/arm/mach-imx/mm-imx5.c

@@ -153,10 +153,10 @@ void __init imx51_soc_init(void)
 void __init imx51_init_late(void)
 {
 	mx51_neon_fixup();
-	imx51_pm_init();
+	imx5_pm_init();
 }
 
 void __init imx53_init_late(void)
 {
-	imx53_pm_init();
+	imx5_pm_init();
 }

arch/arm/mach-imx/pm-imx5.c

@@ -169,14 +169,9 @@ static int __init imx5_pm_common_init(void)
 	return imx5_cpuidle_init();
 }
 
-void __init imx51_pm_init(void)
+void __init imx5_pm_init(void)
 {
 	int ret = imx5_pm_common_init();
 	if (!ret)
 		suspend_set_ops(&mx5_suspend_ops);
 }
-
-void __init imx53_pm_init(void)
-{
-	imx5_pm_common_init();
-}