Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

ARM: davinci: add runtime PM support for clock management

Browse source 
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: Kevin Hilman <khilman@ti.com>
[nsekhar@ti.com: pruned list of header file includes and removed some
debug code]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Kevin Hilman 2012-05-31 09:59:53 -07:00 committed by Sekhar Nori
parent 07caba966d
commit ce9dcb8784
2 changed files with 65 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
arch/arm/mach-davinci/Makefile
View file

@ -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

64
arch/arm/mach-davinci/pm_domain.c Normal file
View file

@ -0,0 +1,64 @@
/*
* 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);