regulator: add device tree support for s5m8767

This device tree support is added for PMIC block of S5m8767 multi
function driver. The usage detail is added in the device tree
documentation section. This change is tested on exynos5250 based
arndale platform by regulator voltage set/get API's.

Reviewed-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 152 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt b/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
new file mode 100644
index 000000000000..a35ff99003a5
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
@@ -0,0 +1,152 @@
+* Samsung S5M8767 Voltage and Current Regulator
+
+The Samsung S5M8767 is a multi-function device which includes volatage and
+current regulators, rtc, charger controller and other sub-blocks. It is
+interfaced to the host controller using a i2c interface. Each sub-block is
+addressed by the host system using different i2c slave address. This document
+describes the bindings for 'pmic' sub-block of s5m8767.
+
+Required properties:
+- compatible: Should be "samsung,s5m8767-pmic".
+- reg: Specifies the i2c slave address of the pmic block. It should be 0x66.
+
+- s5m8767,pmic-buck2-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
+  units for buck2 when changing voltage using gpio dvs. Refer to [1] below
+  for additional information.
+
+- s5m8767,pmic-buck3-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
+  units for buck3 when changing voltage using gpio dvs. Refer to [1] below
+  for additional information.
+
+- s5m8767,pmic-buck4-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
+  units for buck4 when changing voltage using gpio dvs. Refer to [1] below
+  for additional information.
+
+- s5m8767,pmic-buck-ds-gpios: GPIO specifiers for three host gpio's used
+  for selecting GPIO DVS lines. It is one-to-one mapped to dvs gpio lines.
+
+[1] If none of the 's5m8767,pmic-buck[2/3/4]-uses-gpio-dvs' optional
+    property is specified, the 's5m8767,pmic-buck[2/3/4]-dvs-voltage'
+    property should specify atleast one voltage level (which would be a
+    safe operating voltage).
+
+    If either of the 's5m8767,pmic-buck[2/3/4]-uses-gpio-dvs' optional
+    property is specified, then all the eight voltage values for the
+    's5m8767,pmic-buck[2/3/4]-dvs-voltage' should be specified.
+
+Optional properties:
+- interrupt-parent: Specifies the phandle of the interrupt controller to which
+  the interrupts from s5m8767 are delivered to.
+- interrupts: Interrupt specifiers for two interrupt sources.
+  - First interrupt specifier is for 'irq1' interrupt.
+  - Second interrupt specifier is for 'alert' interrupt.
+- s5m8767,pmic-buck2-uses-gpio-dvs: 'buck2' can be controlled by gpio dvs.
+- s5m8767,pmic-buck3-uses-gpio-dvs: 'buck3' can be controlled by gpio dvs.
+- s5m8767,pmic-buck4-uses-gpio-dvs: 'buck4' can be controlled by gpio dvs.
+
+Additional properties required if either of the optional properties are used:
+
+- s5m8767,pmic-buck234-default-dvs-idx: Default voltage setting selected from
+  the possible 8 options selectable by the dvs gpios. The value of this
+  property should be between 0 and 7. If not specified or if out of range, the
+  default value of this property is set to 0.
+
+- s5m8767,pmic-buck-dvs-gpios: GPIO specifiers for three host gpio's used
+  for dvs. The format of the gpio specifier depends in the gpio controller.
+
+Regulators: The regulators of s5m8767 that have to be instantiated should be
+included in a sub-node named 'regulators'. Regulator nodes included in this
+sub-node should be of the format as listed below.
+
+	regulator_name {
+		ldo1_reg: LDO1 {
+			regulator-name = "VDD_ALIVE_1.0V";
+			regulator-min-microvolt = <1100000>;
+			regulator-max-microvolt = <1100000>;
+			regulator-always-on;
+			regulator-boot-on;
+			op_mode = <1>; /* Normal Mode */
+		};
+	};
+The above regulator entries are defined in regulator bindings documentation
+except op_mode description.
+	- op_mode: describes the different operating modes of the LDO's with
+		power mode change in SOC. The different possible values are,
+		0 - always off mode
+		1 - on in normal mode
+		2 - low power mode
+		3 - suspend mode
+
+The following are the names of the regulators that the s5m8767 pmic block
+supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number
+as per the datasheet of s5m8767.
+
+	- LDOn
+		  - valid values for n are 1 to 28
+		  - Example: LDO0, LD01, LDO28
+	- BUCKn
+		  - valid values for n are 1 to 9.
+		  - Example: BUCK1, BUCK2, BUCK9
+
+The bindings inside the regulator nodes use the standard regulator bindings
+which are documented elsewhere.
+
+Example:
+
+	s5m8767_pmic@66 {
+		compatible = "samsung,s5m8767-pmic";
+		reg = <0x66>;
+
+		s5m8767,pmic-buck2-uses-gpio-dvs;
+		s5m8767,pmic-buck3-uses-gpio-dvs;
+		s5m8767,pmic-buck4-uses-gpio-dvs;
+
+		s5m8767,pmic-buck-default-dvs-idx = <0>;
+
+		s5m8767,pmic-buck-dvs-gpios = <&gpx0 0 1 0 0>, /* DVS1 */
+						 <&gpx0 1 1 0 0>, /* DVS2 */
+						 <&gpx0 2 1 0 0>; /* DVS3 */
+
+		s5m8767,pmic-buck-ds-gpios = <&gpx2 3 1 0 0>, /* SET1 */
+						<&gpx2 4 1 0 0>, /* SET2 */
+						<&gpx2 5 1 0 0>; /* SET3 */
+
+		s5m8767,pmic-buck2-dvs-voltage = <1350000>, <1300000>,
+						 <1250000>, <1200000>,
+						 <1150000>, <1100000>,
+						 <1000000>, <950000>;
+
+		s5m8767,pmic-buck3-dvs-voltage = <1100000>, <1100000>,
+						 <1100000>, <1100000>,
+						 <1000000>, <1000000>,
+						 <1000000>, <1000000>;
+
+		s5m8767,pmic-buck4-dvs-voltage = <1200000>, <1200000>,
+						 <1200000>, <1200000>,
+						 <1200000>, <1200000>,
+						 <1200000>, <1200000>;
+
+		regulators {
+			ldo1_reg: LDO1 {
+				regulator-name = "VDD_ABB_3.3V";
+				regulator-min-microvolt = <3300000>;
+				regulator-max-microvolt = <3300000>;
+				op_mode = <1>; /* Normal Mode */
+			};
+
+			ldo2_reg: LDO2 {
+				regulator-name = "VDD_ALIVE_1.1V";
+				regulator-min-microvolt = <1100000>;
+				regulator-max-microvolt = <1100000>;
+				regulator-always-on;
+			};
+
+			buck1_reg: BUCK1 {
+				regulator-name = "VDD_MIF_1.2V";
+				regulator-min-microvolt = <950000>;
+				regulator-max-microvolt = <1350000>;
+				regulator-always-on;
+				regulator-boot-on;
+			};
+		};
+	};