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Commit fc20ffe1 authored by Santosh Shilimkar's avatar Santosh Shilimkar
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ARM: keystone: add PM domain support for clock management 



Add runtime PM core support to Keystone SOCs by using the pm_clk
infrastructure of the PM core. Patch is based on Kevin's pm_domain
work on DaVinci SOCs.

Keystone SOC doesn't have depedency to enable clocks in early
in the boot and hence the clock and PM domain initialisation is done
at subsys_init() level.

Cc: Kevin Hilman <khilman@linaro.org>

Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
parent 4a19aad2

arch/arm/mach-keystone/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -4,3 +4,6 @@ plus_sec := $(call as-instr,.arch_extension sec,+sec) 
AFLAGS_smc.o				:=-Wa,-march=armv7-a$(plus_sec)



obj-$(CONFIG_SMP)			+= platsmp.o



# PM domain driver for Keystone SOCs

obj-$(CONFIG_ARCH_KEYSTONE)		+= pm_domain.o

arch/arm/mach-keystone/pm_domain.c

0 → 100644
+70 −0
Original line number Diff line number Diff line 
/*

 * 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);