regulator: Add Spreadtrum SC2731 regulator documentation

This patch adds support for the Spreadtrum SC2731
voltage regulator device.

Signed-off-by: Erick Chen <erick.chen@spreadtrum.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/regulator/sprd,sc2731-regulator.txt b/Documentation/devicetree/bindings/regulator/sprd,sc2731-regulator.txt
new file mode 100644 (file)
index 0000000..63dc078
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/sprd,sc2731-regulator.txt
@@ -0,0 +1,43 @@
+Spreadtrum SC2731 Voltage regulators
+
+The SC2731 integrates low-voltage and low quiescent current DCDC/LDO.
+14 LDO and 3 DCDCs are designed for external use. All DCDCs/LDOs have
+their own bypass (power-down) control signals. External tantalum or MLCC
+ceramic capacitors are recommended to use with these LDOs.
+
+Required properties:
+ - compatible: should be "sprd,sc27xx-regulator".
+
+List of regulators provided by this controller. It is named according to
+its regulator type, BUCK_<name> and LDO_<name>. The definition for each
+of these nodes is defined using the standard binding for regulators at
+Documentation/devicetree/bindings/regulator/regulator.txt.
+
+The valid names for regulators are:
+BUCK:
+       BUCK_CPU0, BUCK_CPU1, BUCK_RF
+LDO:
+       LDO_CAMA0, LDO_CAMA1, LDO_CAMMOT, LDO_VLDO, LDO_EMMCCORE, LDO_SDCORE,
+       LDO_SDIO, LDO_WIFIPA, LDO_USB33, LDO_CAMD0, LDO_CAMD1, LDO_CON,
+       LDO_CAMIO, LDO_SRAM
+
+Example:
+       regulators {
+               compatible = "sprd,sc27xx-regulator";
+
+               vddarm0: BUCK_CPU0 {
+                       regulator-name = "vddarm0";
+                       regulator-min-microvolt = <400000>;
+                       regulator-max-microvolt = <1996875>;
+                       regulator-ramp-delay = <25000>;
+                       regulator-always-on;
+               };
+
+               vddcama0: LDO_CAMA0 {
+                       regulator-name = "vddcama0";
+                       regulator-min-microvolt = <1200000>;
+                       regulator-max-microvolt = <3750000>;
+                       regulator-enable-ramp-delay = <100>;
+               };
+               ...
+       };