regulator: s2mps11: Document external GPIO control

Add documentation for new property for controlling (enable/disable) some
of the S2MPS14 regulators by GPIO.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/Documentation/devicetree/bindings/mfd/s2mps11.txt b/Documentation/devicetree/bindings/mfd/s2mps11.txt
index 802e839b08294f6ef5f54c561b03c1981e395f0c..d81ba30c0d8bd628bad8f11e3471f0b9146386b3 100644 (file)
--- a/Documentation/devicetree/bindings/mfd/s2mps11.txt
+++ b/Documentation/devicetree/bindings/mfd/s2mps11.txt
@@ -56,6 +56,20 @@ for a particular group of BUCKs. So provide same regulator-ramp-delay<value>.
 Grouping of BUCKs sharing ramp rate setting is as follow : BUCK[1, 6],
 BUCK[3, 4], and BUCK[7, 8, 10]
 
+On S2MPS14 the LDO10, LDO11 and LDO12 can be configured to external control
+over GPIO. To turn this feature on this property must be added to the regulator
+sub-node:
+       - samsung,ext-control-gpios: GPIO specifier for one GPIO
+               controlling this regulator (enable/disable);
+Example:
+       LDO12 {
+               regulator-name = "V_EMMC_2.8V";
+               regulator-min-microvolt = <2800000>;
+               regulator-max-microvolt = <2800000>;
+               samsung,ext-control-gpios = <&gpk0 2 0>;
+       };
+
+
 The regulator constraints inside the regulator nodes use the standard regulator
 bindings which are documented elsewhere.