regulator: s5m8767: Document new binding for Buck9 GPIO control

Add documentation for new binding for controlling (enable/disable) the
Buck9 Converter by GPIO (BUCK9EN).

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

1 files changed, 12 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt b/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
index fc6b38f035bd..d290988ed975 100644
--- a/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
@@ -69,13 +69,16 @@ sub-node should be of the format as listed below.
                 };
         };
 The above regulator entries are defined in regulator bindings documentation
-except op_mode description.
+except these properties:
         - 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
+        - s5m8767,pmic-ext-control-gpios: (optional) GPIO specifier for one
+                GPIO controlling this regulator (enable/disable); This is
+                valid only for buck9.
 
 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
@@ -148,5 +151,13 @@ Example:
                                 regulator-always-on;
                                 regulator-boot-on;
                         };
+
+                        vemmc_reg: BUCK9 {
+                                regulator-name = "VMEM_VDD_2.8V";
+                                regulator-min-microvolt = <2800000>;
+                                regulator-max-microvolt = <2800000>;
+                                op_mode = <3>; /* Standby Mode */
+                                s5m8767,pmic-ext-control-gpios = <&gpk0 2 0>;
+                        };
                 };
         };