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Commit ce9dcb87 authored by Kevin Hilman's avatar Kevin Hilman Committed by Sekhar Nori
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ARM: davinci: add runtime PM support for clock management 



Add runtime PM core support to davinci by using the pm_clk
infrastructure of the PM core.

When runtime PM is enabled, the davinci runtime PM implementation will
use the pm_clk layer to enable/disable clocks on demand.  When runtime
PM is disabled, the pm_clk core will automatically enable clocks when
the driver is bound and disable clocks when the driver is unbound.

Cc: Mark A. Greer <mgreer@animalcreek.com>
Cc: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarKevin Hilman <khilman@ti.com>
[nsekhar@ti.com: pruned list of header file includes and removed some
debug code]
Signed-off-by: default avatarSekhar Nori <nsekhar@ti.com>
parent 07caba96

arch/arm/mach-davinci/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -39,3 +39,4 @@ obj-$(CONFIG_MACH_OMAPL138_HAWKBOARD) += board-omapl138-hawk.o 
obj-$(CONFIG_CPU_FREQ)			+= cpufreq.o

obj-$(CONFIG_CPU_IDLE)			+= cpuidle.o

obj-$(CONFIG_SUSPEND)			+= pm.o sleep.o

obj-$(CONFIG_HAVE_CLK)			+= pm_domain.o

arch/arm/mach-davinci/pm_domain.c

0 → 100644
+64 −0
Original line number Diff line number Diff line 
/*

 * Runtime PM support code for DaVinci

 *

 * Author: Kevin Hilman

 *

 * Copyright (C) 2012 Texas Instruments, Inc.

 *

 * This file is licensed under the terms of the GNU General Public

 * License version 2. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */

#include <linux/init.h>

#include <linux/pm_runtime.h>

#include <linux/pm_clock.h>

#include <linux/platform_device.h>



#ifdef CONFIG_PM_RUNTIME

static int davinci_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 davinci_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 davinci_pm_domain = {

	.ops = {

		SET_RUNTIME_PM_OPS(davinci_pm_runtime_suspend,

				   davinci_pm_runtime_resume, NULL)

		USE_PLATFORM_PM_SLEEP_OPS

	},

};



static struct pm_clk_notifier_block platform_bus_notifier = {

	.pm_domain = &davinci_pm_domain,

};



static int __init davinci_pm_runtime_init(void)

{

	pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);



	return 0;

}

core_initcall(davinci_pm_runtime_init);