ARM: mxs: call mxs_pm_init() as a machine_desc hook

The device_initcall is not a friend of multiplatform build.  Call
mxs_pm_init() as a machine_desc hook instead of device_initcall.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-mxs/mach-mxs.c

@@ -32,6 +32,8 @@
 #include <asm/mach/time.h>
 #include <asm/system_misc.h>
 
+#include "pm.h"
+
 /* MXS DIGCTL SAIF CLKMUX */
 #define MXS_DIGCTL_SAIF_CLKMUX_DIRECT		0x0
 #define MXS_DIGCTL_SAIF_CLKMUX_CROSSINPUT	0x1
@@ -607,6 +609,7 @@ DT_MACHINE_START(MXS, "Freescale MXS (Device Tree)")
 	.handle_irq	= icoll_handle_irq,
 	.init_time	= mxs_timer_init,
 	.init_machine	= mxs_machine_init,
+	.init_late      = mxs_pm_init,
 	.dt_compat	= mxs_dt_compat,
 	.restart	= mxs_restart,
 MACHINE_END

arch/arm/mach-mxs/pm.c

@@ -34,9 +34,7 @@ static struct platform_suspend_ops mxs_suspend_ops = {
 	.valid = suspend_valid_only_mem,
 };
 
-static int __init mxs_pm_init(void)
+void __init mxs_pm_init(void)
 {
 	suspend_set_ops(&mxs_suspend_ops);
-	return 0;
 }
-device_initcall(mxs_pm_init);

arch/arm/mach-mxs/pm.h

+/*
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ARCH_MXS_PM_H
+#define __ARCH_MXS_PM_H
+
+void mxs_pm_init(void);
+
+#endif