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: Santosh Shilimkar <santosh.shilimkar@ti.com>
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@ -4,3 +4,6 @@ plus_sec := $(call as-instr,.arch_extension sec,+sec)
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AFLAGS_smc.o :=-Wa,-march=armv7-a$(plus_sec)
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obj-$(CONFIG_SMP) += platsmp.o
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# PM domain driver for Keystone SOCs
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obj-$(CONFIG_ARCH_KEYSTONE) += pm_domain.o
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70
arch/arm/mach-keystone/pm_domain.c
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arch/arm/mach-keystone/pm_domain.c
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@ -0,0 +1,70 @@
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/*
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* PM domain driver for Keystone2 devices
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*
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* Copyright 2013 Texas Instruments, Inc.
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* Santosh Shilimkar <santosh.shillimkar@ti.com>
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*
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* Based on Kevins work on DAVINCI SOCs
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* Kevin Hilman <khilman@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/pm_runtime.h>
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#include <linux/pm_clock.h>
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#include <linux/platform_device.h>
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#include <linux/clk-provider.h>
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#ifdef CONFIG_PM_RUNTIME
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static int keystone_pm_runtime_suspend(struct device *dev)
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{
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int ret;
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dev_dbg(dev, "%s\n", __func__);
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ret = pm_generic_runtime_suspend(dev);
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if (ret)
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return ret;
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ret = pm_clk_suspend(dev);
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if (ret) {
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pm_generic_runtime_resume(dev);
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return ret;
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}
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return 0;
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}
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static int keystone_pm_runtime_resume(struct device *dev)
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{
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dev_dbg(dev, "%s\n", __func__);
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pm_clk_resume(dev);
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return pm_generic_runtime_resume(dev);
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}
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#endif
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static struct dev_pm_domain keystone_pm_domain = {
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.ops = {
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SET_RUNTIME_PM_OPS(keystone_pm_runtime_suspend,
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keystone_pm_runtime_resume, NULL)
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USE_PLATFORM_PM_SLEEP_OPS
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},
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};
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static struct pm_clk_notifier_block platform_domain_notifier = {
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.pm_domain = &keystone_pm_domain,
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};
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int __init keystone_pm_runtime_init(void)
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{
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of_clk_init(NULL);
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pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier);
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return 0;
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}
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subsys_initcall(keystone_pm_runtime_init);
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