Merge branch 'v3.4-for-rafael' of...

Merge branch 'v3.4-for-rafael' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into pm-domains

* 'v3.4-for-rafael' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
  ARM: EXYNOS: Hook up power domains to generic power domain infrastructure
  PM / Domains: Add OF support

Documentation/devicetree/bindings/arm/exynos/power_domain.txt

+* Samsung Exynos Power Domains
+
+Exynos processors include support for multiple power domains which are used
+to gate power to one or more peripherals on the processor.
+
+Required Properties:
+- compatiable: should be one of the following.
+    * samsung,exynos4210-pd - for exynos4210 type power domain.
+- reg: physical base address of the controller and length of memory mapped
+    region.
+
+Optional Properties:
+- samsung,exynos4210-pd-off: Specifies that the power domain is in turned-off
+    state during boot and remains to be turned-off until explicitly turned-on.
+
+Example:
+
+	lcd0: power-domain-lcd0 {
+		compatible = "samsung,exynos4210-pd";
+		reg = <0x10023C00 0x10>;
+	};

arch/arm/mach-exynos/Kconfig

@@ -34,6 +34,7 @@ config CPU_EXYNOS4210
 	select ARM_CPU_SUSPEND if PM
 	select S5P_PM if PM
 	select S5P_SLEEP if PM
+	select PM_GENERIC_DOMAINS
 	help
 	  Enable EXYNOS4210 CPU support
 
@@ -74,11 +75,6 @@ config EXYNOS4_SETUP_FIMD0
 	help
 	  Common setup code for FIMD0.
 
-config EXYNOS4_DEV_PD
-	bool
-	help
-	  Compile in platform device definitions for Power Domain
-
 config EXYNOS4_DEV_SYSMMU
 	bool
 	help
@@ -195,7 +191,6 @@ config MACH_SMDKV310
 	select EXYNOS4_DEV_AHCI
 	select SAMSUNG_DEV_KEYPAD
 	select EXYNOS4_DEV_DMA
-	select EXYNOS4_DEV_PD
 	select SAMSUNG_DEV_PWM
 	select EXYNOS4_DEV_USB_OHCI
 	select EXYNOS4_DEV_SYSMMU
@@ -243,7 +238,6 @@ config MACH_UNIVERSAL_C210
 	select S5P_DEV_ONENAND
 	select S5P_DEV_TV
 	select EXYNOS4_DEV_DMA
-	select EXYNOS4_DEV_PD
 	select EXYNOS4_SETUP_FIMD0
 	select EXYNOS4_SETUP_I2C1
 	select EXYNOS4_SETUP_I2C3
@@ -277,7 +271,6 @@ config MACH_NURI
 	select S5P_DEV_USB_EHCI
 	select S5P_SETUP_MIPIPHY
 	select EXYNOS4_DEV_DMA
-	select EXYNOS4_DEV_PD
 	select EXYNOS4_SETUP_FIMC
 	select EXYNOS4_SETUP_FIMD0
 	select EXYNOS4_SETUP_I2C1
@@ -310,7 +303,6 @@ config MACH_ORIGEN
 	select SAMSUNG_DEV_BACKLIGHT
 	select SAMSUNG_DEV_PWM
 	select EXYNOS4_DEV_DMA
-	select EXYNOS4_DEV_PD
 	select EXYNOS4_DEV_USB_OHCI
 	select EXYNOS4_SETUP_FIMD0
 	select EXYNOS4_SETUP_SDHCI

arch/arm/mach-exynos/Makefile

@@ -17,6 +17,7 @@ obj-$(CONFIG_CPU_EXYNOS4210)	+= clock-exynos4210.o
 obj-$(CONFIG_SOC_EXYNOS4212)	+= clock-exynos4212.o
 
 obj-$(CONFIG_PM)		+= pm.o
+obj-$(CONFIG_PM_GENERIC_DOMAINS) += pm_domains.o
 obj-$(CONFIG_CPU_IDLE)		+= cpuidle.o
 
 obj-$(CONFIG_ARCH_EXYNOS4)	+= pmu.o
@@ -45,7 +46,6 @@ obj-$(CONFIG_MACH_EXYNOS4_DT)		+= mach-exynos4-dt.o
 
 obj-$(CONFIG_ARCH_EXYNOS4)		+= dev-audio.o
 obj-$(CONFIG_EXYNOS4_DEV_AHCI)		+= dev-ahci.o
-obj-$(CONFIG_EXYNOS4_DEV_PD)		+= dev-pd.o
 obj-$(CONFIG_EXYNOS4_DEV_SYSMMU)	+= dev-sysmmu.o
 obj-$(CONFIG_EXYNOS4_DEV_DWMCI)		+= dev-dwmci.o
 obj-$(CONFIG_EXYNOS4_DEV_DMA)		+= dma.o

arch/arm/mach-exynos/dev-pd.c

-/* linux/arch/arm/mach-exynos4/dev-pd.c
- *
- * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
- *		http://www.samsung.com
- *
- * EXYNOS4 - Power Domain support
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
-
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/delay.h>
-
-#include <mach/regs-pmu.h>
-
-#include <plat/pd.h>
-
-static int exynos4_pd_enable(struct device *dev)
-{
-	struct samsung_pd_info *pdata =  dev->platform_data;
-	u32 timeout;
-
-	__raw_writel(S5P_INT_LOCAL_PWR_EN, pdata->base);
-
-	/* Wait max 1ms */
-	timeout = 10;
-	while ((__raw_readl(pdata->base + 0x4) & S5P_INT_LOCAL_PWR_EN)
-		!= S5P_INT_LOCAL_PWR_EN) {
-		if (timeout == 0) {
-			printk(KERN_ERR "Power domain %s enable failed.\n",
-				dev_name(dev));
-			return -ETIMEDOUT;
-		}
-		timeout--;
-		udelay(100);
-	}
-
-	return 0;
-}
-
-static int exynos4_pd_disable(struct device *dev)
-{
-	struct samsung_pd_info *pdata =  dev->platform_data;
-	u32 timeout;
-
-	__raw_writel(0, pdata->base);
-
-	/* Wait max 1ms */
-	timeout = 10;
-	while (__raw_readl(pdata->base + 0x4) & S5P_INT_LOCAL_PWR_EN) {
-		if (timeout == 0) {
-			printk(KERN_ERR "Power domain %s disable failed.\n",
-				dev_name(dev));
-			return -ETIMEDOUT;
-		}
-		timeout--;
-		udelay(100);
-	}
-
-	return 0;
-}
-
-struct platform_device exynos4_device_pd[] = {
-	{
-		.name		= "samsung-pd",
-		.id		= 0,
-		.dev = {
-			.platform_data = &(struct samsung_pd_info) {
-				.enable		= exynos4_pd_enable,
-				.disable	= exynos4_pd_disable,
-				.base		= S5P_PMU_MFC_CONF,
-			},
-		},
-	}, {
-		.name		= "samsung-pd",
-		.id		= 1,
-		.dev = {
-			.platform_data = &(struct samsung_pd_info) {
-				.enable		= exynos4_pd_enable,
-				.disable	= exynos4_pd_disable,
-				.base		= S5P_PMU_G3D_CONF,
-			},
-		},
-	}, {
-		.name		= "samsung-pd",
-		.id		= 2,
-		.dev = {
-			.platform_data = &(struct samsung_pd_info) {
-				.enable		= exynos4_pd_enable,
-				.disable	= exynos4_pd_disable,
-				.base		= S5P_PMU_LCD0_CONF,
-			},
-		},
-	}, {
-		.name		= "samsung-pd",
-		.id		= 3,
-		.dev = {
-			.platform_data = &(struct samsung_pd_info) {
-				.enable		= exynos4_pd_enable,
-				.disable	= exynos4_pd_disable,
-				.base		= S5P_PMU_LCD1_CONF,
-			},
-		},
-	}, {
-		.name		= "samsung-pd",
-		.id		= 4,
-		.dev = {
-			.platform_data = &(struct samsung_pd_info) {
-				.enable		= exynos4_pd_enable,
-				.disable	= exynos4_pd_disable,
-				.base		= S5P_PMU_TV_CONF,
-			},
-		},
-	}, {
-		.name		= "samsung-pd",
-		.id		= 5,
-		.dev = {
-			.platform_data = &(struct samsung_pd_info) {
-				.enable		= exynos4_pd_enable,
-				.disable	= exynos4_pd_disable,
-				.base		= S5P_PMU_CAM_CONF,
-			},
-		},
-	}, {
-		.name		= "samsung-pd",
-		.id		= 6,
-		.dev = {
-			.platform_data = &(struct samsung_pd_info) {
-				.enable		= exynos4_pd_enable,
-				.disable	= exynos4_pd_disable,
-				.base		= S5P_PMU_GPS_CONF,
-			},
-		},
-	},
-};

arch/arm/mach-exynos/mach-nuri.c

@@ -1263,9 +1263,6 @@ static struct platform_device *nuri_devices[] __initdata = {
 	&s5p_device_mfc,
 	&s5p_device_mfc_l,
 	&s5p_device_mfc_r,
-	&exynos4_device_pd[PD_MFC],
-	&exynos4_device_pd[PD_LCD0],
-	&exynos4_device_pd[PD_CAM],
 	&s5p_device_fimc_md,
 
 	/* NURI Devices */
@@ -1315,14 +1312,6 @@ static void __init nuri_machine_init(void)
 
 	/* Last */
 	platform_add_devices(nuri_devices, ARRAY_SIZE(nuri_devices));
-	s5p_device_mfc.dev.parent = &exynos4_device_pd[PD_MFC].dev;
-	s5p_device_fimd0.dev.parent = &exynos4_device_pd[PD_LCD0].dev;
-
-	s5p_device_fimc0.dev.parent = &exynos4_device_pd[PD_CAM].dev;
-	s5p_device_fimc1.dev.parent = &exynos4_device_pd[PD_CAM].dev;
-	s5p_device_fimc2.dev.parent = &exynos4_device_pd[PD_CAM].dev;
-	s5p_device_fimc3.dev.parent = &exynos4_device_pd[PD_CAM].dev;
-	s5p_device_mipi_csis0.dev.parent = &exynos4_device_pd[PD_CAM].dev;
 }
 
 MACHINE_START(NURI, "NURI")

arch/arm/mach-exynos/mach-origen.c

@@ -621,13 +621,6 @@ static struct platform_device *origen_devices[] __initdata = {
 	&s5p_device_mfc_r,
 	&s5p_device_mixer,
 	&exynos4_device_ohci,
-	&exynos4_device_pd[PD_LCD0],
-	&exynos4_device_pd[PD_TV],
-	&exynos4_device_pd[PD_G3D],
-	&exynos4_device_pd[PD_LCD1],
-	&exynos4_device_pd[PD_CAM],
-	&exynos4_device_pd[PD_GPS],
-	&exynos4_device_pd[PD_MFC],
 	&origen_device_gpiokeys,
 	&origen_lcd_hv070wsa,
 };
@@ -695,13 +688,6 @@ static void __init origen_machine_init(void)
 
 	platform_add_devices(origen_devices, ARRAY_SIZE(origen_devices));
 
-	s5p_device_fimd0.dev.parent = &exynos4_device_pd[PD_LCD0].dev;
-
-	s5p_device_hdmi.dev.parent = &exynos4_device_pd[PD_TV].dev;
-	s5p_device_mixer.dev.parent = &exynos4_device_pd[PD_TV].dev;
-
-	s5p_device_mfc.dev.parent = &exynos4_device_pd[PD_MFC].dev;
-
 	samsung_bl_set(&origen_bl_gpio_info, &origen_bl_data);
 }
 

arch/arm/mach-exynos/mach-smdkv310.c

@@ -277,13 +277,6 @@ static struct platform_device *smdkv310_devices[] __initdata = {
 	&s5p_device_mfc,
 	&s5p_device_mfc_l,
 	&s5p_device_mfc_r,
-	&exynos4_device_pd[PD_MFC],
-	&exynos4_device_pd[PD_G3D],
-	&exynos4_device_pd[PD_LCD0],
-	&exynos4_device_pd[PD_LCD1],
-	&exynos4_device_pd[PD_CAM],
-	&exynos4_device_pd[PD_TV],
-	&exynos4_device_pd[PD_GPS],
 	&exynos4_device_spdif,
 	&exynos4_device_sysmmu,
 	&samsung_asoc_dma,
@@ -336,10 +329,6 @@ static void s5p_tv_setup(void)
 	WARN_ON(gpio_request_one(EXYNOS4_GPX3(7), GPIOF_IN, "hpd-plug"));
 	s3c_gpio_cfgpin(EXYNOS4_GPX3(7), S3C_GPIO_SFN(0x3));
 	s3c_gpio_setpull(EXYNOS4_GPX3(7), S3C_GPIO_PULL_NONE);
-
-	/* setup dependencies between TV devices */
-	s5p_device_hdmi.dev.parent = &exynos4_device_pd[PD_TV].dev;
-	s5p_device_mixer.dev.parent = &exynos4_device_pd[PD_TV].dev;
 }
 
 static void __init smdkv310_map_io(void)
@@ -379,7 +368,6 @@ static void __init smdkv310_machine_init(void)
 	clk_xusbxti.rate = 24000000;
 
 	platform_add_devices(smdkv310_devices, ARRAY_SIZE(smdkv310_devices));
-	s5p_device_mfc.dev.parent = &exynos4_device_pd[PD_MFC].dev;
 }
 
 MACHINE_START(SMDKV310, "SMDKV310")

arch/arm/mach-exynos/mach-universal_c210.c

@@ -969,7 +969,6 @@ static struct platform_device *universal_devices[] __initdata = {
 	&s3c_device_i2c5,
 	&s5p_device_i2c_hdmiphy,
 	&hdmi_fixed_voltage,
-	&exynos4_device_pd[PD_TV],
 	&s5p_device_hdmi,
 	&s5p_device_sdo,
 	&s5p_device_mixer,
@@ -982,9 +981,6 @@ static struct platform_device *universal_devices[] __initdata = {
 	&s5p_device_mfc,
 	&s5p_device_mfc_l,
 	&s5p_device_mfc_r,
-	&exynos4_device_pd[PD_MFC],
-	&exynos4_device_pd[PD_LCD0],
-	&exynos4_device_pd[PD_CAM],
 	&cam_i_core_fixed_reg_dev,
 	&cam_s_if_fixed_reg_dev,
 	&s5p_device_fimc_md,
@@ -1003,10 +999,6 @@ void s5p_tv_setup(void)
 	gpio_request_one(EXYNOS4_GPX3(7), GPIOF_IN, "hpd-plug");
 	s3c_gpio_cfgpin(EXYNOS4_GPX3(7), S3C_GPIO_SFN(0x3));
 	s3c_gpio_setpull(EXYNOS4_GPX3(7), S3C_GPIO_PULL_NONE);
-
-	/* setup dependencies between TV devices */
-	s5p_device_hdmi.dev.parent = &exynos4_device_pd[PD_TV].dev;
-	s5p_device_mixer.dev.parent = &exynos4_device_pd[PD_TV].dev;
 }
 
 static void __init universal_reserve(void)
@@ -1040,15 +1032,6 @@ static void __init universal_machine_init(void)
 
 	/* Last */
 	platform_add_devices(universal_devices, ARRAY_SIZE(universal_devices));
-
-	s5p_device_mfc.dev.parent = &exynos4_device_pd[PD_MFC].dev;
-	s5p_device_fimd0.dev.parent = &exynos4_device_pd[PD_LCD0].dev;
-
-	s5p_device_fimc0.dev.parent = &exynos4_device_pd[PD_CAM].dev;
-	s5p_device_fimc1.dev.parent = &exynos4_device_pd[PD_CAM].dev;
-	s5p_device_fimc2.dev.parent = &exynos4_device_pd[PD_CAM].dev;
-	s5p_device_fimc3.dev.parent = &exynos4_device_pd[PD_CAM].dev;
-	s5p_device_mipi_csis0.dev.parent = &exynos4_device_pd[PD_CAM].dev;
 }
 
 MACHINE_START(UNIVERSAL_C210, "UNIVERSAL_C210")

arch/arm/mach-exynos/pm_domains.c

+/*
+ * Exynos Generic power domain support.
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Implementation of Exynos specific power domain control which is used in
+ * conjunction with runtime-pm. Support for both device-tree and non-device-tree
+ * based power domain support is included.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/pm_domain.h>
+#include <linux/delay.h>
+#include <linux/of_address.h>
+
+#include <mach/regs-pmu.h>
+#include <plat/devs.h>
+
+/*
+ * Exynos specific wrapper around the generic power domain
+ */
+struct exynos_pm_domain {
+	void __iomem *base;
+	char const *name;
+	bool is_off;
+	struct generic_pm_domain pd;
+};
+
+static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
+{
+	struct exynos_pm_domain *pd;
+	void __iomem *base;
+	u32 timeout, pwr;
+	char *op;
+
+	pd = container_of(domain, struct exynos_pm_domain, pd);
+	base = pd->base;
+
+	pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
+	__raw_writel(pwr, base);
+
+	/* Wait max 1ms */
+	timeout = 10;
+
+	while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN)	!= pwr) {
+		if (!timeout) {
+			op = (power_on) ? "enable" : "disable";
+			pr_err("Power domain %s %s failed\n", domain->name, op);
+			return -ETIMEDOUT;
+		}
+		timeout--;
+		cpu_relax();
+		usleep_range(80, 100);
+	}
+	return 0;
+}
+
+static int exynos_pd_power_on(struct generic_pm_domain *domain)
+{
+	return exynos_pd_power(domain, true);
+}
+
+static int exynos_pd_power_off(struct generic_pm_domain *domain)
+{
+	return exynos_pd_power(domain, false);
+}
+
+#define EXYNOS_GPD(PD, BASE, NAME)			\
+static struct exynos_pm_domain PD = {			\
+	.base = (void __iomem *)BASE,			\
+	.name = NAME,					\
+	.pd = {						\
+		.power_off = exynos_pd_power_off,	\
+		.power_on = exynos_pd_power_on,	\
+	},						\
+}
+
+#ifdef CONFIG_OF
+static __init int exynos_pm_dt_parse_domains(void)
+{
+	struct device_node *np;
+
+	for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
+		struct exynos_pm_domain *pd;
+
+		pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+		if (!pd) {
+			pr_err("%s: failed to allocate memory for domain\n",
+					__func__);
+			return -ENOMEM;
+		}
+
+		if (of_get_property(np, "samsung,exynos4210-pd-off", NULL))
+			pd->is_off = true;
+		pd->name = np->name;
+		pd->base = of_iomap(np, 0);
+		pd->pd.power_off = exynos_pd_power_off;
+		pd->pd.power_on = exynos_pd_power_on;
+		pd->pd.of_node = np;
+		pm_genpd_init(&pd->pd, NULL, false);
+	}
+	return 0;
+}
+#else
+static __init int exynos_pm_dt_parse_domains(void)
+{
+	return 0;
+}
+#endif /* CONFIG_OF */
+
+static __init void exynos_pm_add_dev_to_genpd(struct platform_device *pdev,
+						struct exynos_pm_domain *pd)
+{
+	if (pdev->dev.bus) {
+		if (pm_genpd_add_device(&pd->pd, &pdev->dev))
+			pr_info("%s: error in adding %s device to %s power"
+				"domain\n", __func__, dev_name(&pdev->dev),
+				pd->name);
+	}
+}
+
+EXYNOS_GPD(exynos4_pd_mfc, S5P_PMU_MFC_CONF, "pd-mfc");
+EXYNOS_GPD(exynos4_pd_g3d, S5P_PMU_G3D_CONF, "pd-g3d");
+EXYNOS_GPD(exynos4_pd_lcd0, S5P_PMU_LCD0_CONF, "pd-lcd0");
+EXYNOS_GPD(exynos4_pd_lcd1, S5P_PMU_LCD1_CONF, "pd-lcd1");
+EXYNOS_GPD(exynos4_pd_tv, S5P_PMU_TV_CONF, "pd-tv");
+EXYNOS_GPD(exynos4_pd_cam, S5P_PMU_CAM_CONF, "pd-cam");
+EXYNOS_GPD(exynos4_pd_gps, S5P_PMU_GPS_CONF, "pd-gps");
+
+static struct exynos_pm_domain *exynos4_pm_domains[] = {
+	&exynos4_pd_mfc,
+	&exynos4_pd_g3d,
+	&exynos4_pd_lcd0,
+	&exynos4_pd_lcd1,
+	&exynos4_pd_tv,
+	&exynos4_pd_cam,
+	&exynos4_pd_gps,
+};
+
+static __init int exynos4_pm_init_power_domain(void)
+{
+	int idx;
+
+	if (of_have_populated_dt())
+		return exynos_pm_dt_parse_domains();
+
+	for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++)
+		pm_genpd_init(&exynos4_pm_domains[idx]->pd, NULL,
+				exynos4_pm_domains[idx]->is_off);
+
+#ifdef CONFIG_S5P_DEV_FIMD0
+	exynos_pm_add_dev_to_genpd(&s5p_device_fimd0, &exynos4_pd_lcd0);
+#endif
+#ifdef CONFIG_S5P_DEV_TV
+	exynos_pm_add_dev_to_genpd(&s5p_device_hdmi, &exynos4_pd_tv);
+	exynos_pm_add_dev_to_genpd(&s5p_device_mixer, &exynos4_pd_tv);
+#endif
+#ifdef CONFIG_S5P_DEV_MFC
+	exynos_pm_add_dev_to_genpd(&s5p_device_mfc, &exynos4_pd_mfc);
+#endif
+#ifdef CONFIG_S5P_DEV_FIMC0
+	exynos_pm_add_dev_to_genpd(&s5p_device_fimc0, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_FIMC1
+	exynos_pm_add_dev_to_genpd(&s5p_device_fimc1, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_FIMC2
+	exynos_pm_add_dev_to_genpd(&s5p_device_fimc2, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_FIMC3
+	exynos_pm_add_dev_to_genpd(&s5p_device_fimc3, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_CSIS0
+	exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis0, &exynos4_pd_cam);
+#endif
+#ifdef CONFIG_S5P_DEV_CSIS1
+	exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis1, &exynos4_pd_cam);
+#endif
+	return 0;
+}
+arch_initcall(exynos4_pm_init_power_domain);
+
+static __init int exynos_pm_late_initcall(void)
+{
+	pm_genpd_poweroff_unused();
+	return 0;
+}
+late_initcall(exynos_pm_late_initcall);

drivers/base/power/domain.c

@@ -1229,6 +1229,38 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
 	return ret;
 }
 
+/**
+ * __pm_genpd_of_add_device - Add a device to an I/O PM domain.
+ * @genpd_node: Device tree node pointer representing a PM domain to which the
+ *   the device is added to.
+ * @dev: Device to be added.
+ * @td: Set of PM QoS timing parameters to attach to the device.
+ */
+int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev,
+			     struct gpd_timing_data *td)
+{
+	struct generic_pm_domain *genpd = NULL, *gpd;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev))
+		return -EINVAL;
+
+	mutex_lock(&gpd_list_lock);
+	list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
+		if (gpd->of_node == genpd_node) {
+			genpd = gpd;
+			break;
+		}
+	}
+	mutex_unlock(&gpd_list_lock);
+
+	if (!genpd)
+		return -EINVAL;
+
+	return __pm_genpd_add_device(genpd, dev, td);
+}
+
 /**
  * pm_genpd_remove_device - Remove a device from an I/O PM domain.
  * @genpd: PM domain to remove the device from.

include/linux/pm_domain.h

@@ -11,6 +11,7 @@
 
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/of.h>
 
 enum gpd_status {
 	GPD_STATE_ACTIVE = 0,	/* PM domain is active */
@@ -70,6 +71,7 @@ struct generic_pm_domain {
 	s64 break_even_ns;	/* Power break even for the entire domain. */
 	s64 max_off_time_ns;	/* Maximum allowed "suspended" time. */
 	ktime_t power_off_time;
+	struct device_node *of_node; /* Node in device tree */
 };
 
 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
@@ -117,12 +119,22 @@ extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
 				 struct device *dev,
 				 struct gpd_timing_data *td);
 
+extern int __pm_genpd_of_add_device(struct device_node *genpd_node,
+				    struct device *dev,
+				    struct gpd_timing_data *td);
+
 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
 				      struct device *dev)
 {
 	return __pm_genpd_add_device(genpd, dev, NULL);
 }
 
+static inline int pm_genpd_of_add_device(struct device_node *genpd_node,
+					 struct device *dev)
+{
+	return __pm_genpd_of_add_device(genpd_node, dev, NULL);
+}
+
 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 				  struct device *dev);
 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,