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author | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2013-07-14 17:17:39 -0400 |
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committer | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2013-10-10 19:51:19 -0400 |
commit | fc20ffe1213beb09bb7fb6687b404fe48183a55e (patch) | |
tree | 659ceecafcddbccd4a90c993b6f9ff8a7ebe49bc /arch/arm/mach-keystone | |
parent | 4a19aad2b1623aee85a38e316d5868d1596f54c3 (diff) | |
download | linux-fc20ffe1213beb09bb7fb6687b404fe48183a55e.tar.gz linux-fc20ffe1213beb09bb7fb6687b404fe48183a55e.tar.bz2 linux-fc20ffe1213beb09bb7fb6687b404fe48183a55e.zip |
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>
Diffstat (limited to 'arch/arm/mach-keystone')
-rw-r--r-- | arch/arm/mach-keystone/Makefile | 3 | ||||
-rw-r--r-- | arch/arm/mach-keystone/pm_domain.c | 70 |
2 files changed, 73 insertions, 0 deletions
diff --git a/arch/arm/mach-keystone/Makefile b/arch/arm/mach-keystone/Makefile index ddc52b05dc84..25d92396fbfa 100644 --- a/arch/arm/mach-keystone/Makefile +++ b/arch/arm/mach-keystone/Makefile @@ -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 diff --git a/arch/arm/mach-keystone/pm_domain.c b/arch/arm/mach-keystone/pm_domain.c new file mode 100644 index 000000000000..beac3fb1d205 --- /dev/null +++ b/arch/arm/mach-keystone/pm_domain.c @@ -0,0 +1,70 @@ +/* + * 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); |