Merge tag 'for-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply

Pull power supply and reset updates from Sebastian Reichel:
 - introduce reboot mode driver
 - add DT support to max8903
 - add power supply support for axp221
 - misc fixes

* tag 'for-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply:
  power: reset: add reboot mode driver
  dt-bindings: power: reset: add document for reboot-mode driver
  power_supply: fix return value of get_property
  power: qcom_smbb: Make an extcon for usb cable detection
  max8903: adds support for initiation via device tree
  max8903: adds documentation for device tree bindings.
  max8903: remove unnecessary 'out of memory' error message.
  max8903: removes non zero validity checks on gpios.
  max8903: adds requesting of gpios.
  max8903: cleans up confusing relationship between dc_valid, dok and dcm.
  max8903: store pointer to pdata instead of copying it.
  power_supply: bq27xxx_battery: Group register mappings into one table
  docs: Move brcm,bcm21664-resetmgr.txt
  power/reset: make syscon_poweroff() static
  power: axp20x_usb: Add support for usb power-supply on axp22x pmics
  power_supply: bq27xxx_battery: Index register numbers by enum
  power_supply: bq27xxx_battery: Fix copy/paste error in header comment
  MAINTAINERS: Add file patterns for power supply device tree bindings
  power: reset: keystone: Enable COMPILE_TEST

14 files changed, 682 insertions, 239 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 0f11a0f4c369..acd4a1524a1e 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -394,6 +394,7 @@ config CHARGER_QCOM_SMBB
 	tristate "Qualcomm Switch-Mode Battery Charger and Boost"
 	depends on MFD_SPMI_PMIC || COMPILE_TEST
 	depends on OF
+	depends on EXTCON
 	help
 	  Say Y to include support for the Switch-Mode Battery Charger and
 	  Boost (SMBB) hardware found in Qualcomm PM8941 PMICs.  The charger
diff --git a/drivers/power/axp20x_usb_power.c b/drivers/power/axp20x_usb_power.c
index 421a90b83567..6af6feb7058d 100644
--- a/drivers/power/axp20x_usb_power.c
+++ b/drivers/power/axp20x_usb_power.c
@@ -42,6 +42,7 @@
 #define AXP20X_VBUS_MON_VBUS_VALID	BIT(3)
 
 struct axp20x_usb_power {
+	struct device_node *np;
 	struct regmap *regmap;
 	struct power_supply *supply;
 };
@@ -85,7 +86,12 @@ static int axp20x_usb_power_get_property(struct power_supply *psy,
 
 		switch (v & AXP20X_VBUS_CLIMIT_MASK) {
 		case AXP20X_VBUC_CLIMIT_100mA:
-			val->intval = 100000;
+			if (of_device_is_compatible(power->np,
+					"x-powers,axp202-usb-power-supply")) {
+				val->intval = 100000;
+			} else {
+				val->intval = -1; /* No 100mA limit */
+			}
 			break;
 		case AXP20X_VBUC_CLIMIT_500mA:
 			val->intval = 500000;
@@ -122,16 +128,19 @@ static int axp20x_usb_power_get_property(struct power_supply *psy,
 			break;
 		}
 
-		ret = regmap_read(power->regmap, AXP20X_USB_OTG_STATUS, &v);
-		if (ret)
-			return ret;
+		val->intval = POWER_SUPPLY_HEALTH_GOOD;
 
-		if (!(v & AXP20X_USB_STATUS_VBUS_VALID)) {
-			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
-			break;
-		}
+		if (of_device_is_compatible(power->np,
+				"x-powers,axp202-usb-power-supply")) {
+			ret = regmap_read(power->regmap,
+					  AXP20X_USB_OTG_STATUS, &v);
+			if (ret)
+				return ret;
 
-		val->intval = POWER_SUPPLY_HEALTH_GOOD;
+			if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
+				val->intval =
+					POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+		}
 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
@@ -156,6 +165,14 @@ static enum power_supply_property axp20x_usb_power_properties[] = {
 	POWER_SUPPLY_PROP_CURRENT_NOW,
 };
 
+static enum power_supply_property axp22x_usb_power_properties[] = {
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN,
+	POWER_SUPPLY_PROP_CURRENT_MAX,
+};
+
 static const struct power_supply_desc axp20x_usb_power_desc = {
 	.name = "axp20x-usb",
 	.type = POWER_SUPPLY_TYPE_USB,
@@ -164,13 +181,25 @@ static const struct power_supply_desc axp20x_usb_power_desc = {
 	.get_property = axp20x_usb_power_get_property,
 };
 
+static const struct power_supply_desc axp22x_usb_power_desc = {
+	.name = "axp20x-usb",
+	.type = POWER_SUPPLY_TYPE_USB,
+	.properties = axp22x_usb_power_properties,
+	.num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
+	.get_property = axp20x_usb_power_get_property,
+};
+
 static int axp20x_usb_power_probe(struct platform_device *pdev)
 {
 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 	struct power_supply_config psy_cfg = {};
 	struct axp20x_usb_power *power;
-	static const char * const irq_names[] = { "VBUS_PLUGIN",
-		"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID" };
+	static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
+		"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
+	static const char * const axp22x_irq_names[] = {
+		"VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
+	static const char * const *irq_names;
+	const struct power_supply_desc *usb_power_desc;
 	int i, irq, ret;
 
 	if (!of_device_is_available(pdev->dev.of_node))
@@ -185,31 +214,47 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 	if (!power)
 		return -ENOMEM;
 
+	power->np = pdev->dev.of_node;
 	power->regmap = axp20x->regmap;
 
-	/* Enable vbus valid checking */
-	ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
-		    AXP20X_VBUS_MON_VBUS_VALID, AXP20X_VBUS_MON_VBUS_VALID);
-	if (ret)
-		return ret;
+	if (of_device_is_compatible(power->np,
+			"x-powers,axp202-usb-power-supply")) {
+		/* Enable vbus valid checking */
+		ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
+					 AXP20X_VBUS_MON_VBUS_VALID,
+					 AXP20X_VBUS_MON_VBUS_VALID);
+		if (ret)
+			return ret;
 
-	/* Enable vbus voltage and current measurement */
-	ret = regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
+		/* Enable vbus voltage and current measurement */
+		ret = regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
 			AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT,
 			AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT);
-	if (ret)
-		return ret;
+		if (ret)
+			return ret;
+
+		usb_power_desc = &axp20x_usb_power_desc;
+		irq_names = axp20x_irq_names;
+	} else if (of_device_is_compatible(power->np,
+			"x-powers,axp221-usb-power-supply")) {
+		usb_power_desc = &axp22x_usb_power_desc;
+		irq_names = axp22x_irq_names;
+	} else {
+		dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
+			axp20x->variant);
+		return -EINVAL;
+	}
 
 	psy_cfg.of_node = pdev->dev.of_node;
 	psy_cfg.drv_data = power;
 
-	power->supply = devm_power_supply_register(&pdev->dev,
-					&axp20x_usb_power_desc, &psy_cfg);
+	power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
+						   &psy_cfg);
 	if (IS_ERR(power->supply))
 		return PTR_ERR(power->supply);
 
 	/* Request irqs after registering, as irqs may trigger immediately */
-	for (i = 0; i < ARRAY_SIZE(irq_names); i++) {
+	for (i = 0; irq_names[i]; i++) {
 		irq = platform_get_irq_byname(pdev, irq_names[i]);
 		if (irq < 0) {
 			dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
@@ -229,6 +274,7 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 
 static const struct of_device_id axp20x_usb_power_match[] = {
 	{ .compatible = "x-powers,axp202-usb-power-supply" },
+	{ .compatible = "x-powers,axp221-usb-power-supply" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
diff --git a/drivers/power/bq27xxx_battery.c b/drivers/power/bq27xxx_battery.c
index e90b3f307e0f..323d05a12f9b 100644
--- a/drivers/power/bq27xxx_battery.c
+++ b/drivers/power/bq27xxx_battery.c
@@ -82,6 +82,7 @@
  *
  * These are indexes into a device's register mapping array.
  */
+
 enum bq27xxx_reg_index {
 	BQ27XXX_REG_CTRL = 0,	/* Control */
 	BQ27XXX_REG_TEMP,	/* Temperature */
@@ -100,157 +101,144 @@ enum bq27xxx_reg_index {
 	BQ27XXX_REG_SOC,	/* State-of-Charge */
 	BQ27XXX_REG_DCAP,	/* Design Capacity */
 	BQ27XXX_REG_AP,		/* Average Power */
+	BQ27XXX_REG_MAX,	/* sentinel */
 };
 
 /* Register mappings */
-static u8 bq27000_regs[] = {
-	0x00,	/* CONTROL	*/
-	0x06,	/* TEMP		*/
-	INVALID_REG_ADDR,	/* INT TEMP - NA*/
-	0x08,	/* VOLT		*/
-	0x14,	/* AVG CURR	*/
-	0x0a,	/* FLAGS	*/
-	0x16,	/* TTE		*/
-	0x18,	/* TTF		*/
-	0x1c,	/* TTES		*/
-	0x26,	/* TTECP	*/
-	0x0c,	/* NAC		*/
-	0x12,	/* LMD(FCC)	*/
-	0x2a,	/* CYCT		*/
-	0x22,	/* AE		*/
-	0x0b,	/* SOC(RSOC)	*/
-	0x76,	/* DCAP(ILMD)	*/
-	0x24,	/* AP		*/
-};
-
-static u8 bq27010_regs[] = {
-	0x00,	/* CONTROL	*/
-	0x06,	/* TEMP		*/
-	INVALID_REG_ADDR,	/* INT TEMP - NA*/
-	0x08,	/* VOLT		*/
-	0x14,	/* AVG CURR	*/
-	0x0a,	/* FLAGS	*/
-	0x16,	/* TTE		*/
-	0x18,	/* TTF		*/
-	0x1c,	/* TTES		*/
-	0x26,	/* TTECP	*/
-	0x0c,	/* NAC		*/
-	0x12,	/* LMD(FCC)	*/
-	0x2a,	/* CYCT		*/
-	INVALID_REG_ADDR,	/* AE - NA	*/
-	0x0b,	/* SOC(RSOC)	*/
-	0x76,	/* DCAP(ILMD)	*/
-	INVALID_REG_ADDR,	/* AP - NA	*/
-};
-
-static u8 bq27500_regs[] = {
-	0x00,	/* CONTROL	*/
-	0x06,	/* TEMP		*/
-	0x28,	/* INT TEMP	*/
-	0x08,	/* VOLT		*/
-	0x14,	/* AVG CURR	*/
-	0x0a,	/* FLAGS	*/
-	0x16,	/* TTE		*/
-	INVALID_REG_ADDR,	/* TTF - NA	*/
-	0x1a,	/* TTES		*/
-	INVALID_REG_ADDR,	/* TTECP - NA	*/
-	0x0c,	/* NAC		*/
-	0x12,	/* LMD(FCC)	*/
-	0x2a,	/* CYCT		*/
-	INVALID_REG_ADDR,	/* AE - NA	*/
-	0x2c,	/* SOC(RSOC)	*/
-	0x3c,	/* DCAP(ILMD)	*/
-	INVALID_REG_ADDR,	/* AP - NA	*/
-};
-
-static u8 bq27530_regs[] = {
-	0x00,	/* CONTROL	*/
-	0x06,	/* TEMP		*/
-	0x32,	/* INT TEMP	*/
-	0x08,	/* VOLT		*/
-	0x14,	/* AVG CURR	*/
-	0x0a,	/* FLAGS	*/
-	0x16,	/* TTE		*/
-	INVALID_REG_ADDR,	/* TTF - NA	*/
-	INVALID_REG_ADDR,	/* TTES - NA	*/
-	INVALID_REG_ADDR,	/* TTECP - NA	*/
-	0x0c,	/* NAC		*/
-	0x12,	/* LMD(FCC)	*/
-	0x2a,	/* CYCT		*/
-	INVALID_REG_ADDR,	/* AE - NA	*/
-	0x2c,	/* SOC(RSOC)	*/
-	INVALID_REG_ADDR,	/* DCAP - NA	*/
-	0x24,	/* AP		*/
-};
-
-static u8 bq27541_regs[] = {
-	0x00,	/* CONTROL	*/
-	0x06,	/* TEMP		*/
-	0x28,	/* INT TEMP	*/
-	0x08,	/* VOLT		*/
-	0x14,	/* AVG CURR	*/
-	0x0a,	/* FLAGS	*/
-	0x16,	/* TTE		*/
-	INVALID_REG_ADDR,	/* TTF - NA	*/
-	INVALID_REG_ADDR,	/* TTES - NA	*/
-	INVALID_REG_ADDR,	/* TTECP - NA	*/
-	0x0c,	/* NAC		*/
-	0x12,	/* LMD(FCC)	*/
-	0x2a,	/* CYCT		*/
-	INVALID_REG_ADDR,	/* AE - NA	*/
-	0x2c,	/* SOC(RSOC)	*/
-	0x3c,	/* DCAP		*/
-	0x24,	/* AP		*/
-};
-
-static u8 bq27545_regs[] = {
-	0x00,	/* CONTROL	*/
-	0x06,	/* TEMP		*/
-	0x28,	/* INT TEMP	*/
-	0x08,	/* VOLT		*/
-	0x14,	/* AVG CURR	*/
-	0x0a,	/* FLAGS	*/
-	0x16,	/* TTE		*/
-	INVALID_REG_ADDR,	/* TTF - NA	*/
-	INVALID_REG_ADDR,	/* TTES - NA	*/
-	INVALID_REG_ADDR,	/* TTECP - NA	*/
-	0x0c,	/* NAC		*/
-	0x12,	/* LMD(FCC)	*/
-	0x2a,	/* CYCT		*/
-	INVALID_REG_ADDR,	/* AE - NA	*/
-	0x2c,	/* SOC(RSOC)	*/
-	INVALID_REG_ADDR,	/* DCAP - NA */
-	0x24,	/* AP		*/
-};
-
-static u8 bq27421_regs[] = {
-	0x00,	/* CONTROL	*/
-	0x02,	/* TEMP		*/
-	0x1e,	/* INT TEMP	*/
-	0x04,	/* VOLT		*/
-	0x10,	/* AVG CURR	*/
-	0x06,	/* FLAGS	*/
-	INVALID_REG_ADDR,	/* TTE - NA	*/
-	INVALID_REG_ADDR,	/* TTF - NA	*/
-	INVALID_REG_ADDR,	/* TTES - NA	*/
-	INVALID_REG_ADDR,	/* TTECP - NA	*/
-	0x08,	/* NAC		*/
-	0x0e,	/* FCC		*/
-	INVALID_REG_ADDR,	/* CYCT - NA	*/
-	INVALID_REG_ADDR,	/* AE - NA	*/
-	0x1c,	/* SOC		*/
-	0x3c,	/* DCAP		*/
-	0x18,	/* AP		*/
-};
-
-static u8 *bq27xxx_regs[] = {
-	[BQ27000] = bq27000_regs,
-	[BQ27010] = bq27010_regs,
-	[BQ27500] = bq27500_regs,
-	[BQ27530] = bq27530_regs,
-	[BQ27541] = bq27541_regs,
-	[BQ27545] = bq27545_regs,
-	[BQ27421] = bq27421_regs,
+static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
+	[BQ27000] = {
+		[BQ27XXX_REG_CTRL] = 0x00,
+		[BQ27XXX_REG_TEMP] = 0x06,
+		[BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_VOLT] = 0x08,
+		[BQ27XXX_REG_AI] = 0x14,
+		[BQ27XXX_REG_FLAGS] = 0x0a,
+		[BQ27XXX_REG_TTE] = 0x16,
+		[BQ27XXX_REG_TTF] = 0x18,
+		[BQ27XXX_REG_TTES] = 0x1c,
+		[BQ27XXX_REG_TTECP] = 0x26,
+		[BQ27XXX_REG_NAC] = 0x0c,
+		[BQ27XXX_REG_FCC] = 0x12,
+		[BQ27XXX_REG_CYCT] = 0x2a,
+		[BQ27XXX_REG_AE] = 0x22,
+		[BQ27XXX_REG_SOC] = 0x0b,
+		[BQ27XXX_REG_DCAP] = 0x76,
+		[BQ27XXX_REG_AP] = 0x24,
+	},
+	[BQ27010] = {
+		[BQ27XXX_REG_CTRL] = 0x00,
+		[BQ27XXX_REG_TEMP] = 0x06,
+		[BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_VOLT] = 0x08,
+		[BQ27XXX_REG_AI] = 0x14,
+		[BQ27XXX_REG_FLAGS] = 0x0a,
+		[BQ27XXX_REG_TTE] = 0x16,
+		[BQ27XXX_REG_TTF] = 0x18,
+		[BQ27XXX_REG_TTES] = 0x1c,
+		[BQ27XXX_REG_TTECP] = 0x26,
+		[BQ27XXX_REG_NAC] = 0x0c,
+		[BQ27XXX_REG_FCC] = 0x12,
+		[BQ27XXX_REG_CYCT] = 0x2a,
+		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_SOC] = 0x0b,
+		[BQ27XXX_REG_DCAP] = 0x76,
+		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
+	},
+	[BQ27500] = {
+		[BQ27XXX_REG_CTRL] = 0x00,
+		[BQ27XXX_REG_TEMP] = 0x06,
+		[BQ27XXX_REG_INT_TEMP] = 0x28,
+		[BQ27XXX_REG_VOLT] = 0x08,
+		[BQ27XXX_REG_AI] = 0x14,
+		[BQ27XXX_REG_FLAGS] = 0x0a,
+		[BQ27XXX_REG_TTE] = 0x16,
+		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTES] = 0x1a,
+		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_NAC] = 0x0c,
+		[BQ27XXX_REG_FCC] = 0x12,
+		[BQ27XXX_REG_CYCT] = 0x2a,
+		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_SOC] = 0x2c,
+		[BQ27XXX_REG_DCAP] = 0x3c,
+		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
+	},
+	[BQ27530] = {
+		[BQ27XXX_REG_CTRL] = 0x00,
+		[BQ27XXX_REG_TEMP] = 0x06,
+		[BQ27XXX_REG_INT_TEMP] = 0x32,
+		[BQ27XXX_REG_VOLT] = 0x08,
+		[BQ27XXX_REG_AI] = 0x14,
+		[BQ27XXX_REG_FLAGS] = 0x0a,
+		[BQ27XXX_REG_TTE] = 0x16,
+		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_NAC] = 0x0c,
+		[BQ27XXX_REG_FCC] = 0x12,
+		[BQ27XXX_REG_CYCT] = 0x2a,
+		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_SOC] = 0x2c,
+		[BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_AP] = 0x24,
+	},
+	[BQ27541] = {
+		[BQ27XXX_REG_CTRL] = 0x00,
+		[BQ27XXX_REG_TEMP] = 0x06,
+		[BQ27XXX_REG_INT_TEMP] = 0x28,
+		[BQ27XXX_REG_VOLT] = 0x08,
+		[BQ27XXX_REG_AI] = 0x14,
+		[BQ27XXX_REG_FLAGS] = 0x0a,
+		[BQ27XXX_REG_TTE] = 0x16,
+		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_NAC] = 0x0c,
+		[BQ27XXX_REG_FCC] = 0x12,
+		[BQ27XXX_REG_CYCT] = 0x2a,
+		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_SOC] = 0x2c,
+		[BQ27XXX_REG_DCAP] = 0x3c,
+		[BQ27XXX_REG_AP] = 0x24,
+	},
+	[BQ27545] = {
+		[BQ27XXX_REG_CTRL] = 0x00,
+		[BQ27XXX_REG_TEMP] = 0x06,
+		[BQ27XXX_REG_INT_TEMP] = 0x28,
+		[BQ27XXX_REG_VOLT] = 0x08,
+		[BQ27XXX_REG_AI] = 0x14,
+		[BQ27XXX_REG_FLAGS] = 0x0a,
+		[BQ27XXX_REG_TTE] = 0x16,
+		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_NAC] = 0x0c,
+		[BQ27XXX_REG_FCC] = 0x12,
+		[BQ27XXX_REG_CYCT] = 0x2a,
+		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_SOC] = 0x2c,
+		[BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_AP] = 0x24,
+	},
+	[BQ27421] = {
+		[BQ27XXX_REG_CTRL] = 0x00,
+		[BQ27XXX_REG_TEMP] = 0x02,
+		[BQ27XXX_REG_INT_TEMP] = 0x1e,
+		[BQ27XXX_REG_VOLT] = 0x04,
+		[BQ27XXX_REG_AI] = 0x10,
+		[BQ27XXX_REG_FLAGS] = 0x06,
+		[BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_NAC] = 0x08,
+		[BQ27XXX_REG_FCC] = 0x0e,
+		[BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
+		[BQ27XXX_REG_SOC] = 0x1c,
+		[BQ27XXX_REG_DCAP] = 0x3c,
+		[BQ27XXX_REG_AP] = 0x18,
+	},
 };
 
 static enum power_supply_property bq27000_battery_props[] = {
diff --git a/drivers/power/bq27xxx_battery_i2c.c b/drivers/power/bq27xxx_battery_i2c.c
index b8f8d3ade31b..85d4ea2a9c20 100644
--- a/drivers/power/bq27xxx_battery_i2c.c
+++ b/drivers/power/bq27xxx_battery_i2c.c
@@ -1,5 +1,5 @@
 /*
- * SCI Reset driver for Keystone based devices
+ * BQ27xxx battery monitor I2C driver
  *
  * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
  *	Andrew F. Davis <afd@ti.com>
diff --git a/drivers/power/max8903_charger.c b/drivers/power/max8903_charger.c
index 17876caf31e5..fdc73d686153 100644
--- a/drivers/power/max8903_charger.c
+++ b/drivers/power/max8903_charger.c
@@ -23,13 +23,16 @@
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/slab.h>
 #include <linux/power_supply.h>
 #include <linux/platform_device.h>
 #include <linux/power/max8903_charger.h>
 
 struct max8903_data {
-	struct max8903_pdata pdata;
+	struct max8903_pdata *pdata;
 	struct device *dev;
 	struct power_supply *psy;
 	struct power_supply_desc psy_desc;
@@ -53,8 +56,8 @@ static int max8903_get_property(struct power_supply *psy,
 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
-		if (data->pdata.chg) {
-			if (gpio_get_value(data->pdata.chg) == 0)
+		if (gpio_is_valid(data->pdata->chg)) {
+			if (gpio_get_value(data->pdata->chg) == 0)
 				val->intval = POWER_SUPPLY_STATUS_CHARGING;
 			else if (data->usb_in || data->ta_in)
 				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
@@ -75,13 +78,14 @@ static int max8903_get_property(struct power_supply *psy,
 	default:
 		return -EINVAL;
 	}
+
 	return 0;
 }
 
 static irqreturn_t max8903_dcin(int irq, void *_data)
 {
 	struct max8903_data *data = _data;
-	struct max8903_pdata *pdata = &data->pdata;
+	struct max8903_pdata *pdata = data->pdata;
 	bool ta_in;
 	enum power_supply_type old_type;
 
@@ -93,11 +97,11 @@ static irqreturn_t max8903_dcin(int irq, void *_data)
 	data->ta_in = ta_in;
 
 	/* Set Current-Limit-Mode 1:DC 0:USB */
-	if (pdata->dcm)
+	if (gpio_is_valid(pdata->dcm))
 		gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
 
 	/* Charger Enable / Disable (cen is negated) */
-	if (pdata->cen)
+	if (gpio_is_valid(pdata->cen))
 		gpio_set_value(pdata->cen, ta_in ? 0 :
 				(data->usb_in ? 0 : 1));
 
@@ -122,7 +126,7 @@ static irqreturn_t max8903_dcin(int irq, void *_data)
 static irqreturn_t max8903_usbin(int irq, void *_data)
 {
 	struct max8903_data *data = _data;
-	struct max8903_pdata *pdata = &data->pdata;
+	struct max8903_pdata *pdata = data->pdata;
 	bool usb_in;
 	enum power_supply_type old_type;
 
@@ -136,7 +140,7 @@ static irqreturn_t max8903_usbin(int irq, void *_data)
 	/* Do not touch Current-Limit-Mode */
 
 	/* Charger Enable / Disable (cen is negated) */
-	if (pdata->cen)
+	if (gpio_is_valid(pdata->cen))
 		gpio_set_value(pdata->cen, usb_in ? 0 :
 				(data->ta_in ? 0 : 1));
 
@@ -161,7 +165,7 @@ static irqreturn_t max8903_usbin(int irq, void *_data)
 static irqreturn_t max8903_fault(int irq, void *_data)
 {
 	struct max8903_data *data = _data;
-	struct max8903_pdata *pdata = &data->pdata;
+	struct max8903_pdata *pdata = data->pdata;
 	bool fault;
 
 	fault = gpio_get_value(pdata->flt) ? false : true;
@@ -179,57 +183,109 @@ static irqreturn_t max8903_fault(int irq, void *_data)
 	return IRQ_HANDLED;
 }
 
-static int max8903_probe(struct platform_device *pdev)
+static struct max8903_pdata *max8903_parse_dt_data(struct device *dev)
 {
-	struct max8903_data *data;
+	struct device_node *np = dev->of_node;
+	struct max8903_pdata *pdata = NULL;
+
+	if (!np)
+		return NULL;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return NULL;
+
+	pdata->dc_valid = false;
+	pdata->usb_valid = false;
+
+	pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
+	if (!gpio_is_valid(pdata->cen))
+		pdata->cen = -EINVAL;
+
+	pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
+	if (!gpio_is_valid(pdata->chg))
+		pdata->chg = -EINVAL;
+
+	pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
+	if (!gpio_is_valid(pdata->flt))
+		pdata->flt = -EINVAL;
+
+	pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
+	if (!gpio_is_valid(pdata->usus))
+		pdata->usus = -EINVAL;
+
+	pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
+	if (!gpio_is_valid(pdata->dcm))
+		pdata->dcm = -EINVAL;
+
+	pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
+	if (!gpio_is_valid(pdata->dok))
+		pdata->dok = -EINVAL;
+	else
+		pdata->dc_valid = true;
+
+	pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
+	if (!gpio_is_valid(pdata->uok))
+		pdata->uok = -EINVAL;
+	else
+		pdata->usb_valid = true;
+
+	return pdata;
+}
+
+static int max8903_setup_gpios(struct platform_device *pdev)
+{
+	struct max8903_data *data = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
 	struct max8903_pdata *pdata = pdev->dev.platform_data;
-	struct power_supply_config psy_cfg = {};
 	int ret = 0;
 	int gpio;
 	int ta_in = 0;
 	int usb_in = 0;
 
-	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
-	if (data == NULL) {
-		dev_err(dev, "Cannot allocate memory.\n");
-		return -ENOMEM;
-	}
-	memcpy(&data->pdata, pdata, sizeof(struct max8903_pdata));
-	data->dev = dev;
-	platform_set_drvdata(pdev, data);
-
-	if (pdata->dc_valid == false && pdata->usb_valid == false) {
-		dev_err(dev, "No valid power sources.\n");
-		return -EINVAL;
-	}
-
 	if (pdata->dc_valid) {
-		if (pdata->dok && gpio_is_valid(pdata->dok) &&
-				pdata->dcm && gpio_is_valid(pdata->dcm)) {
+		if (gpio_is_valid(pdata->dok)) {
+			ret = devm_gpio_request(dev, pdata->dok,
+						data->psy_desc.name);
+			if (ret) {
+				dev_err(dev,
+					"Failed GPIO request for dok: %d err %d\n",
+					pdata->dok, ret);
+				return ret;
+			}
+
 			gpio = pdata->dok; /* PULL_UPed Interrupt */
 			ta_in = gpio_get_value(gpio) ? 0 : 1;
-
-			gpio = pdata->dcm; /* Output */
-			gpio_set_value(gpio, ta_in);
 		} else {
-			dev_err(dev, "When DC is wired, DOK and DCM should"
-					" be wired as well.\n");
+			dev_err(dev, "When DC is wired, DOK should be wired as well.\n");
 			return -EINVAL;
 		}
-	} else {
-		if (pdata->dcm) {
-			if (gpio_is_valid(pdata->dcm))
-				gpio_set_value(pdata->dcm, 0);
-			else {
-				dev_err(dev, "Invalid pin: dcm.\n");
-				return -EINVAL;
-			}
+	}
+
+	if (gpio_is_valid(pdata->dcm)) {
+		ret = devm_gpio_request(dev, pdata->dcm, data->psy_desc.name);
+		if (ret) {
+			dev_err(dev,
+				"Failed GPIO request for dcm: %d err %d\n",
+				pdata->dcm, ret);
+			return ret;
 		}
+
+		gpio = pdata->dcm; /* Output */
+		gpio_set_value(gpio, ta_in);
 	}
 
 	if (pdata->usb_valid) {
-		if (pdata->uok && gpio_is_valid(pdata->uok)) {
+		if (gpio_is_valid(pdata->uok)) {
+			ret = devm_gpio_request(dev, pdata->uok,
+						data->psy_desc.name);
+			if (ret) {
+				dev_err(dev,
+					"Failed GPIO request for uok: %d err %d\n",
+					pdata->uok, ret);
+				return ret;
+			}
+
 			gpio = pdata->uok;
 			usb_in = gpio_get_value(gpio) ? 0 : 1;
 		} else {
@@ -239,33 +295,45 @@ static int max8903_probe(struct platform_device *pdev)
 		}
 	}
 
-	if (pdata->cen) {
-		if (gpio_is_valid(pdata->cen)) {
-			gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
-		} else {
-			dev_err(dev, "Invalid pin: cen.\n");
-			return -EINVAL;
+	if (gpio_is_valid(pdata->cen)) {
+		ret = devm_gpio_request(dev, pdata->cen, data->psy_desc.name);
+		if (ret) {
+			dev_err(dev,
+				"Failed GPIO request for cen: %d err %d\n",
+				pdata->cen, ret);
+			return ret;
 		}
+
+		gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
 	}
 
-	if (pdata->chg) {
-		if (!gpio_is_valid(pdata->chg)) {
-			dev_err(dev, "Invalid pin: chg.\n");
-			return -EINVAL;
+	if (gpio_is_valid(pdata->chg)) {
+		ret = devm_gpio_request(dev, pdata->chg, data->psy_desc.name);
+		if (ret) {
+			dev_err(dev,
+				"Failed GPIO request for chg: %d err %d\n",
+				pdata->chg, ret);
+			return ret;
 		}
 	}
 
-	if (pdata->flt) {
-		if (!gpio_is_valid(pdata->flt)) {
-			dev_err(dev, "Invalid pin: flt.\n");
-			return -EINVAL;
+	if (gpio_is_valid(pdata->flt)) {
+		ret = devm_gpio_request(dev, pdata->flt, data->psy_desc.name);
+		if (ret) {
+			dev_err(dev,
+				"Failed GPIO request for flt: %d err %d\n",
+				pdata->flt, ret);
+			return ret;
 		}
 	}
 
-	if (pdata->usus) {
-		if (!gpio_is_valid(pdata->usus)) {
-			dev_err(dev, "Invalid pin: usus.\n");
-			return -EINVAL;
+	if (gpio_is_valid(pdata->usus)) {
+		ret = devm_gpio_request(dev, pdata->usus, data->psy_desc.name);
+		if (ret) {
+			dev_err(dev,
+				"Failed GPIO request for usus: %d err %d\n",
+				pdata->usus, ret);
+			return ret;
 		}
 	}
 
@@ -273,14 +341,52 @@ static int max8903_probe(struct platform_device *pdev)
 	data->ta_in = ta_in;
 	data->usb_in = usb_in;
 
+	return 0;
+}
+
+static int max8903_probe(struct platform_device *pdev)
+{
+	struct max8903_data *data;
+	struct device *dev = &pdev->dev;
+	struct max8903_pdata *pdata = pdev->dev.platform_data;
+	struct power_supply_config psy_cfg = {};
+	int ret = 0;
+
+	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
+		pdata = max8903_parse_dt_data(dev);
+
+	if (!pdata) {
+		dev_err(dev, "No platform data.\n");
+		return -EINVAL;
+	}
+
+	pdev->dev.platform_data = pdata;
+	data->pdata = pdata;
+	data->dev = dev;
+	platform_set_drvdata(pdev, data);
+
+	if (pdata->dc_valid == false && pdata->usb_valid == false) {
+		dev_err(dev, "No valid power sources.\n");
+		return -EINVAL;
+	}
+
+	ret = max8903_setup_gpios(pdev);
+	if (ret)
+		return ret;
+
 	data->psy_desc.name = "max8903_charger";
-	data->psy_desc.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
-			((usb_in) ? POWER_SUPPLY_TYPE_USB :
+	data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
+			((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
 			 POWER_SUPPLY_TYPE_BATTERY);
 	data->psy_desc.get_property = max8903_get_property;
 	data->psy_desc.properties = max8903_charger_props;
 	data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
 
+	psy_cfg.of_node = dev->of_node;
 	psy_cfg.drv_data = data;
 
 	data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
@@ -315,7 +421,7 @@ static int max8903_probe(struct platform_device *pdev)
 		}
 	}
 
-	if (pdata->flt) {
+	if (gpio_is_valid(pdata->flt)) {
 		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),
 					NULL, max8903_fault,
 					IRQF_TRIGGER_FALLING |
@@ -331,10 +437,17 @@ static int max8903_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id max8903_match_ids[] = {
+	{ .compatible = "maxim,max8903", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, max8903_match_ids);
+
 static struct platform_driver max8903_driver = {
 	.probe	= max8903_probe,
 	.driver = {
 		.name	= "max8903-charger",
+		.of_match_table = max8903_match_ids
 	},
 };
 
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index b13cd074c52a..a74d8ca383a1 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -491,8 +491,11 @@ int power_supply_get_property(struct power_supply *psy,
 			    enum power_supply_property psp,
 			    union power_supply_propval *val)
 {
-	if (atomic_read(&psy->use_cnt) <= 0)
+	if (atomic_read(&psy->use_cnt) <= 0) {
+		if (!psy->initialized)
+			return -EAGAIN;
 		return -ENODEV;
+	}
 
 	return psy->desc->get_property(psy, psp, val);
 }
@@ -785,6 +788,7 @@ __power_supply_register(struct device *parent,
 	 *    after calling power_supply_register()).
 	 */
 	atomic_inc(&psy->use_cnt);
+	psy->initialized = true;
 
 	queue_delayed_work(system_power_efficient_wq,
 			   &psy->deferred_register_work,
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index 80fed98832f9..bcde8d13476a 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -83,7 +83,7 @@ static ssize_t power_supply_show_property(struct device *dev,
 			if (ret == -ENODATA)
 				dev_dbg(dev, "driver has no data for `%s' property\n",
 					attr->attr.name);
-			else if (ret != -ENODEV)
+			else if (ret != -ENODEV && ret != -EAGAIN)
 				dev_err(dev, "driver failed to report `%s' property: %zd\n",
 					attr->attr.name, ret);
 			return ret;
diff --git a/drivers/power/qcom_smbb.c b/drivers/power/qcom_smbb.c
index 5eb1e9e543e2..b5896ba2a602 100644
--- a/drivers/power/qcom_smbb.c
+++ b/drivers/power/qcom_smbb.c
@@ -34,6 +34,7 @@
 #include <linux/power_supply.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
+#include <linux/extcon.h>
 
 #define SMBB_CHG_VMAX		0x040
 #define SMBB_CHG_VSAFE		0x041
@@ -111,6 +112,7 @@ struct smbb_charger {
 	unsigned int revision;
 	unsigned int addr;
 	struct device *dev;
+	struct extcon_dev *edev;
 
 	bool dc_disabled;
 	bool jeita_ext_temp;
@@ -125,6 +127,11 @@ struct smbb_charger {
 	struct regmap *regmap;
 };
 
+static const unsigned int smbb_usb_extcon_cable[] = {
+	EXTCON_USB,
+	EXTCON_NONE,
+};
+
 static int smbb_vbat_weak_fn(unsigned int index)
 {
 	return 2100000 + index * 100000;
@@ -371,6 +378,8 @@ static irqreturn_t smbb_usb_valid_handler(int irq, void *_data)
 	struct smbb_charger *chg = _data;
 
 	smbb_set_line_flag(chg, irq, STATUS_USBIN_VALID);
+	extcon_set_cable_state_(chg->edev, EXTCON_USB,
+				chg->status & STATUS_USBIN_VALID);
 	power_supply_changed(chg->usb_psy);
 
 	return IRQ_HANDLED;
@@ -849,6 +858,18 @@ static int smbb_charger_probe(struct platform_device *pdev)
 		return PTR_ERR(chg->usb_psy);
 	}
 
+	chg->edev = devm_extcon_dev_allocate(&pdev->dev, smbb_usb_extcon_cable);
+	if (IS_ERR(chg->edev)) {
+		dev_err(&pdev->dev, "failed to allocate extcon device\n");
+		return -ENOMEM;
+	}
+
+	rc = devm_extcon_dev_register(&pdev->dev, chg->edev);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "failed to register extcon device\n");
+		return rc;
+	}
+
 	if (!chg->dc_disabled) {
 		dc_cfg.drv_data = chg;
 		dc_cfg.supplied_to = smbb_bif;
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 9bb2622c23bf..7053abced0bc 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -148,7 +148,8 @@ config POWER_RESET_XGENE
 
 config POWER_RESET_KEYSTONE
 	bool "Keystone reset driver"
-	depends on ARCH_KEYSTONE
+	depends on ARCH_KEYSTONE || COMPILE_TEST
+	depends on HAS_IOMEM
 	select MFD_SYSCON
 	help
 	  Reboot support for the KEYSTONE SoCs.
@@ -183,5 +184,19 @@ config POWER_RESET_ZX
 	help
 	  Reboot support for ZTE SoCs.
 
+config REBOOT_MODE
+	tristate
+
+config SYSCON_REBOOT_MODE
+	tristate "Generic SYSCON regmap reboot mode driver"
+	depends on OF
+	select REBOOT_MODE
+	select MFD_SYSCON
+	help
+	  Say y here will enable reboot mode driver. This will
+	  get reboot mode arguments and store it in SYSCON mapped
+	  register, then the bootloader can read it to take different
+	  action according to the mode.
+
 endif
 
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index ab7aa8614d1f..d6b2560d5c4a 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -21,3 +21,5 @@ obj-$(CONFIG_POWER_RESET_SYSCON) += syscon-reboot.o
 obj-$(CONFIG_POWER_RESET_SYSCON_POWEROFF) += syscon-poweroff.o
 obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o
 obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o
+obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o
+obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o
diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c
new file mode 100644
index 000000000000..2dfbbce0f817
--- /dev/null
+++ b/drivers/power/reset/reboot-mode.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/reboot.h>
+#include "reboot-mode.h"
+
+#define PREFIX "mode-"
+
+struct mode_info {
+	const char *mode;
+	u32 magic;
+	struct list_head list;
+};
+
+static unsigned int get_reboot_mode_magic(struct reboot_mode_driver *reboot,
+					  const char *cmd)
+{
+	const char *normal = "normal";
+	int magic = 0;
+	struct mode_info *info;
+
+	if (!cmd)
+		cmd = normal;
+
+	list_for_each_entry(info, &reboot->head, list) {
+		if (!strcmp(info->mode, cmd)) {
+			magic = info->magic;
+			break;
+		}
+	}
+
+	return magic;
+}
+
+static int reboot_mode_notify(struct notifier_block *this,
+			      unsigned long mode, void *cmd)
+{
+	struct reboot_mode_driver *reboot;
+	unsigned int magic;
+
+	reboot = container_of(this, struct reboot_mode_driver, reboot_notifier);
+	magic = get_reboot_mode_magic(reboot, cmd);
+	if (magic)
+		reboot->write(reboot, magic);
+
+	return NOTIFY_DONE;
+}
+
+/**
+ * reboot_mode_register - register a reboot mode driver
+ * @reboot: reboot mode driver
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int reboot_mode_register(struct reboot_mode_driver *reboot)
+{
+	struct mode_info *info;
+	struct property *prop;
+	struct device_node *np = reboot->dev->of_node;
+	size_t len = strlen(PREFIX);
+	int ret;
+
+	INIT_LIST_HEAD(&reboot->head);
+
+	for_each_property_of_node(np, prop) {
+		if (strncmp(prop->name, PREFIX, len))
+			continue;
+
+		info = devm_kzalloc(reboot->dev, sizeof(*info), GFP_KERNEL);
+		if (!info) {
+			ret = -ENOMEM;
+			goto error;
+		}
+
+		if (of_property_read_u32(np, prop->name, &info->magic)) {
+			dev_err(reboot->dev, "reboot mode %s without magic number\n",
+				info->mode);
+			devm_kfree(reboot->dev, info);
+			continue;
+		}
+
+		info->mode = kstrdup_const(prop->name + len, GFP_KERNEL);
+		if (!info->mode) {
+			ret =  -ENOMEM;
+			goto error;
+		} else if (info->mode[0] == '\0') {
+			kfree_const(info->mode);
+			ret = -EINVAL;
+			dev_err(reboot->dev, "invalid mode name(%s): too short!\n",
+				prop->name);
+			goto error;
+		}
+
+		list_add_tail(&info->list, &reboot->head);
+	}
+
+	reboot->reboot_notifier.notifier_call = reboot_mode_notify;
+	register_reboot_notifier(&reboot->reboot_notifier);
+
+	return 0;
+
+error:
+	list_for_each_entry(info, &reboot->head, list)
+		kfree_const(info->mode);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(reboot_mode_register);
+
+/**
+ * reboot_mode_unregister - unregister a reboot mode driver
+ * @reboot: reboot mode driver
+ */
+int reboot_mode_unregister(struct reboot_mode_driver *reboot)
+{
+	struct mode_info *info;
+
+	unregister_reboot_notifier(&reboot->reboot_notifier);
+
+	list_for_each_entry(info, &reboot->head, list)
+		kfree_const(info->mode);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(reboot_mode_unregister);
+
+MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com");
+MODULE_DESCRIPTION("System reboot mode core library");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/power/reset/reboot-mode.h b/drivers/power/reset/reboot-mode.h
new file mode 100644
index 000000000000..2491bb71f591
--- /dev/null
+++ b/drivers/power/reset/reboot-mode.h
@@ -0,0 +1,14 @@
+#ifndef __REBOOT_MODE_H__
+#define __REBOOT_MODE_H__
+
+struct reboot_mode_driver {
+	struct device *dev;
+	struct list_head head;
+	int (*write)(struct reboot_mode_driver *reboot, unsigned int magic);
+	struct notifier_block reboot_notifier;
+};
+
+int reboot_mode_register(struct reboot_mode_driver *reboot);
+int reboot_mode_unregister(struct reboot_mode_driver *reboot);
+
+#endif
diff --git a/drivers/power/reset/syscon-poweroff.c b/drivers/power/reset/syscon-poweroff.c
index 5560b0dbc180..b68338399e5e 100644
--- a/drivers/power/reset/syscon-poweroff.c
+++ b/drivers/power/reset/syscon-poweroff.c
@@ -30,7 +30,7 @@ static struct regmap *map;
 static u32 offset;
 static u32 mask;
 
-void syscon_poweroff(void)
+static void syscon_poweroff(void)
 {
 	/* Issue the poweroff */
 	regmap_write(map, offset, mask);
diff --git a/drivers/power/reset/syscon-reboot-mode.c b/drivers/power/reset/syscon-reboot-mode.c
new file mode 100644
index 000000000000..9e1cba5dd58e
--- /dev/null
+++ b/drivers/power/reset/syscon-reboot-mode.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include "reboot-mode.h"
+
+struct syscon_reboot_mode {
+	struct regmap *map;
+	struct reboot_mode_driver reboot;
+	u32 offset;
+	u32 mask;
+};
+
+static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot,
+				    unsigned int magic)
+{
+	struct syscon_reboot_mode *syscon_rbm;
+	int ret;
+
+	syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);
+
+	ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset,
+				 syscon_rbm->mask, magic);
+	if (ret < 0)
+		dev_err(reboot->dev, "update reboot mode bits failed\n");
+
+	return ret;
+}
+
+static int syscon_reboot_mode_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct syscon_reboot_mode *syscon_rbm;
+
+	syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL);
+	if (!syscon_rbm)
+		return -ENOMEM;
+
+	syscon_rbm->reboot.dev = &pdev->dev;
+	syscon_rbm->reboot.write = syscon_reboot_mode_write;
+	syscon_rbm->mask = 0xffffffff;
+
+	dev_set_drvdata(&pdev->dev, syscon_rbm);
+
+	syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
+	if (IS_ERR(syscon_rbm->map))
+		return PTR_ERR(syscon_rbm->map);
+
+	if (of_property_read_u32(pdev->dev.of_node, "offset",
+	    &syscon_rbm->offset))
+		return -EINVAL;
+
+	of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask);
+
+	ret = reboot_mode_register(&syscon_rbm->reboot);
+	if (ret)
+		dev_err(&pdev->dev, "can't register reboot mode\n");
+
+	return ret;
+}
+
+static int syscon_reboot_mode_remove(struct platform_device *pdev)
+{
+	struct syscon_reboot_mode *syscon_rbm = dev_get_drvdata(&pdev->dev);
+
+	return reboot_mode_unregister(&syscon_rbm->reboot);
+}
+
+static const struct of_device_id syscon_reboot_mode_of_match[] = {
+	{ .compatible = "syscon-reboot-mode" },
+	{}
+};
+
+static struct platform_driver syscon_reboot_mode_driver = {
+	.probe = syscon_reboot_mode_probe,
+	.remove = syscon_reboot_mode_remove,
+	.driver = {
+		.name = "syscon-reboot-mode",
+		.of_match_table = syscon_reboot_mode_of_match,
+	},
+};
+module_platform_driver(syscon_reboot_mode_driver);
+
+MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com");
+MODULE_DESCRIPTION("SYSCON reboot mode driver");
+MODULE_LICENSE("GPL v2");