From: Kevin Hilman <[email protected]> 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 <[email protected]> Cc: Sekhar Nori <[email protected]> Signed-off-by: Kevin Hilman <[email protected]> [[email protected]: pruned list of header file includes and removed some debug code] Signed-off-by: Sekhar Nori <[email protected]> --- arch/arm/mach-davinci/Makefile | 1 + arch/arm/mach-davinci/pm_domain.c | 64 +++++++++++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+) create mode 100644 arch/arm/mach-davinci/pm_domain.c diff --git a/arch/arm/mach-davinci/Makefile b/arch/arm/mach-davinci/Makefile index 2db78bd..2227eff 100644 --- a/arch/arm/mach-davinci/Makefile +++ b/arch/arm/mach-davinci/Makefile @@ -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 diff --git a/arch/arm/mach-davinci/pm_domain.c b/arch/arm/mach-davinci/pm_domain.c new file mode 100644 index 0000000..00946e2 --- /dev/null +++ b/arch/arm/mach-davinci/pm_domain.c @@ -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); -- 1.7.10.1 _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
