regulator: onsemi-ncp6335d: add support for device tree

Port from kernel 3.10

Signed-off-by: Jun Nie <[email protected]>

Documentation/devicetree/bindings/regulator/onsemi-ncp6335d.txt

@@ -0,0 +1,72 @@
+ON Semiconductor NCP6335d regulator
+
+NCP6335d is able to deliver up to 5.0 A, with programmable output voltage from
+0.6 V to 1.87 V in 10mV steps, with synchronous rectification and automatic PWM/
+PFM transitions, enable pins and power good/fail signaling.
+
+The NCP6335d interface is via I2C bus.
+
+Required Properties:
+- compatible:			Must be "onnn,ncp6335d-regulator".
+- reg:				The device 8-bit I2C address.
+- regulator-min-microvolt:	Minimum voltage in microvolts supported by this
+				regulator.
+- regulator-max-microvolt:	Maximum voltage in microvolts supported by this
+				regulator.
+- onnn,min-setpoint:		Minimum setpoint voltage in microvolts supported
+				by this regulator.
+- onnn,step-size:		The step size of the regulator, in uV.
+- onnn,min-slew-ns:		Minimum time in ns needed to change voltage by
+				one step size. This value corresponds to DVS
+				mode bit of 00b in command register.
+- onnn,max-slew-ns:		Maximum time in ns needed to change voltage by
+				one step size. This value corresponds to DVS
+				mode bit of 11b in command register.
+- onnn,vsel:			Working vsel register. Supported value are 0
+				or 1.
+- onnn,slew-ns:			Time in ns needed to change voltage by one step
+				size. Supported value are 333, 666, 1333, 2666.
+
+Optional Properties:
+- onnn,discharge-enable:	Present: discharge enabled.
+				Not Present: discharge disabled.
+- onnn,restore-reg:		Present: Restore vsel register from backup register.
+				Not Present: No restore.
+- onnn,vsel-gpio:		Present: GPIO connects to the VSEL pin and set the
+				VSEL pin according to device tree flag.
+				Not Present: No GPIO is connected to vsel pin.
+- pinctrl-names:		The state name of the VSEL pin configuration.
+				Only support: "default"
+- pinctrl-0:			The phandles of the pin configuration node in
+				pinctrl for VSEL pin.
+				For details of pinctrl properties, please refer to:
+				"Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt"
+- onnn,sleep-enable:		Present: Forced in sleep mode when EN and VSEL
+				pins are low.
+				Not Present: Low quiescent current mode when EN and VSEL
+				pins are low.
+- onnn,mode:			A string which specifies the initial mode to use for the regulator.
+				Supported values are "pwm" and "auto". PWM mode is more
+				robust, but draws more current than auto mode. If this propery
+				is not specified, then the regulator will be in the hardware default mode.
+
+Example:
+	i2c_0 {
+		ncp6335d-regulator@1c {
+			compatible = "onnn,ncp6335d-regulator";
+			reg = <0x1c>;
+			onnn,vsel = <0>;
+			onnn,slew-rate-ns = <2666>;
+			onnn,discharge-enable;
+			onnn,step-size = <10000>;
+			onnn,min-slew-ns = <333>;
+			onnn,max-slew-ns = <2666>;
+			pintrl-names = "default";
+			pinctrl-0 = <&ext_buck_vsel_default>;
+
+			regulator-min-microvolt = <1050000>;
+			regulator-max-microvolt = <1350000>;
+			onnn,min-setpoint = <600000>;
+			onnn,vsel-gpio = <&msmgpio 2 1>;
+		};
+	};

drivers/regulator/Kconfig

@@ -1233,5 +1233,14 @@ config REGULATOR_QCOM_LABIBB
 	  boost regulator and IBB can be used as a negative boost regulator
 	  for LCD display panel.
 
+config REGULATOR_ONSEMI_NCP6335D
+	tristate "OnSemi NCP6335D regulator support"
+	depends on I2C
+	help
+	 This driver supports the OnSemi NCP6335D switching voltage regulator
+	 (buck convertor). The regulator is controlled using an I2C interface
+	 and supports a programmable voltage range from 0.6V to 1.4V in steps
+	 of 6.25mV.
+
 endif
 

drivers/regulator/Makefile

@@ -152,5 +152,6 @@ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o
 obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
 obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
 obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
+obj-$(CONFIG_REGULATOR_ONSEMI_NCP6335D) += onsemi-ncp6335d.o
 
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG