regulator: add documentation for ACT8945A's regulator DT bindings

This patch adds documentation for the DT bindings of the regulator
subdevice of ACT8945A MFD.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/regulator/act8945a-regulator.txt b/Documentation/devicetree/bindings/regulator/act8945a-regulator.txt
new file mode 100644 (file)
index 0000000..5c80a77
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/act8945a-regulator.txt
@@ -0,0 +1,80 @@
+Device-Tree bindings for regulators of Active-semi ACT8945A Multi-Function Device
+
+Required properties:
+ - compatible: "active-semi,act8945a", please refer to ../mfd/act8945a.txt.
+
+Optional properties:
+- active-semi,vsel-high: Indicates if the VSEL pin is set to logic-high.
+  If this property is missing, assume the VSEL pin is set to logic-low.
+
+Optional input supply properties:
+  - vp1-supply: The input supply for REG_DCDC1
+  - vp2-supply: The input supply for REG_DCDC2
+  - vp3-supply: The input supply for REG_DCDC3
+  - inl45-supply: The input supply for REG_LDO1 and REG_LDO2
+  - inl67-supply: The input supply for REG_LDO3 and REG_LDO4
+
+Any standard regulator properties can be used to configure the single regulator.
+
+The valid names for regulators are:
+       REG_DCDC1, REG_DCDC2, REG_DCDC3, REG_LDO1, REG_LDO2, REG_LDO3, REG_LDO4.
+
+Example:
+       pmic@5b {
+               compatible = "active-semi,act8945a";
+               reg = <0x5b>;
+               status = "okay";
+
+               active-semi,vsel-high;
+
+               regulators {
+                       vdd_1v35_reg: REG_DCDC1 {
+                               regulator-name = "VDD_1V35";
+                               regulator-min-microvolt = <1350000>;
+                               regulator-max-microvolt = <1350000>;
+                               regulator-always-on;
+                       };
+
+                       vdd_1v2_reg: REG_DCDC2 {
+                               regulator-name = "VDD_1V2";
+                               regulator-min-microvolt = <1100000>;
+                               regulator-max-microvolt = <1300000>;
+                               regulator-always-on;
+                       };
+
+                       vdd_3v3_reg: REG_DCDC3 {
+                               regulator-name = "VDD_3V3";
+                               regulator-min-microvolt = <3300000>;
+                               regulator-max-microvolt = <3300000>;
+                               regulator-always-on;
+                       };
+
+                       vdd_fuse_reg: REG_LDO1 {
+                               regulator-name = "VDD_FUSE";
+                               regulator-min-microvolt = <2500000>;
+                               regulator-max-microvolt = <2500000>;
+                               regulator-always-on;
+                       };
+
+                       vdd_3v3_lp_reg: REG_LDO2 {
+                               regulator-name = "VDD_3V3_LP";
+                               regulator-min-microvolt = <3300000>;
+                               regulator-max-microvolt = <3300000>;
+                               regulator-always-on;
+                       };
+
+                       vdd_led_reg: REG_LDO3 {
+                               regulator-name = "VDD_LED";
+                               regulator-min-microvolt = <3300000>;
+                               regulator-max-microvolt = <3300000>;
+                               regulator-always-on;
+                       };
+
+                       vdd_sdhc_1v8_reg: REG_LDO4 {
+                               regulator-name = "VDD_SDHC_1V8";
+                               regulator-min-microvolt = <1800000>;
+                               regulator-max-microvolt = <1800000>;
+                               regulator-always-on;
+                       };
+               };
+       };