ARM: keystone: add PM domain support for clock management

AFLAGS_smc.o				:=-Wa,-march=armv7-a$(plus_sec)

obj-$(CONFIG_SMP)			+= platsmp.o

# PM domain driver for Keystone SOCs

obj-$(CONFIG_ARCH_KEYSTONE)		+= pm_domain.o

/*

 * PM domain driver for Keystone2 devices

 *

 * Copyright 2013 Texas Instruments, Inc.

 *	Santosh Shilimkar <santosh.shillimkar@ti.com>

 *

 * Based on Kevins work on DAVINCI SOCs

 *	Kevin Hilman <khilman@linaro.org>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 */

#include <linux/init.h>

#include <linux/pm_runtime.h>

#include <linux/pm_clock.h>

#include <linux/platform_device.h>

#include <linux/clk-provider.h>

#ifdef CONFIG_PM_RUNTIME

static int keystone_pm_runtime_suspend(struct device *dev)

{

	int ret;

	dev_dbg(dev, "%s\n", __func__);

	ret = pm_generic_runtime_suspend(dev);

	if (ret)

		return ret;

	ret = pm_clk_suspend(dev);

	if (ret) {

		pm_generic_runtime_resume(dev);

		return ret;

	}

	return 0;

}

static int keystone_pm_runtime_resume(struct device *dev)

{

	dev_dbg(dev, "%s\n", __func__);

	pm_clk_resume(dev);

	return pm_generic_runtime_resume(dev);

}

#endif

static struct dev_pm_domain keystone_pm_domain = {

	.ops = {

		SET_RUNTIME_PM_OPS(keystone_pm_runtime_suspend,

				   keystone_pm_runtime_resume, NULL)

		USE_PLATFORM_PM_SLEEP_OPS

	},

};

static struct pm_clk_notifier_block platform_domain_notifier = {

	.pm_domain = &keystone_pm_domain,

};

int __init keystone_pm_runtime_init(void)

{

	of_clk_init(NULL);

	pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier);

	return 0;

}

subsys_initcall(keystone_pm_runtime_init);