[PATCH 5/5] regulator: s5m8767: Document new bindings for Buck9 GPIOcontrol

[Krzysztof Kozlowski]

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

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
 .../bindings/regulator/s5m8767-regulator.txt       |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt b/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
index d1660a90fc06..6a921b5582a2 100644
--- a/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
@@ -43,6 +43,7 @@ Optional properties:
 - 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.
+- s5m8767,pmic-buck9-uses-gpio: 'buck9' can be enabled/disabled by GPIO.
 
 Additional properties required if either of the optional properties are used:
 
@@ -54,6 +55,11 @@ Additional properties required if either of the optional properties are used:
 - 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.
 
+- s5m8767,pmic-buck9-gpio: GPIO specifier for one GPIO controlling buck9.
+  This property is required when 's5m8767,pmic-buck9-uses-gpio' is specified.
+  Additionally for proper GPIO control the buck9 regulator should be also
+  configured with proper opmode (low power or suspend).
+
 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.
@@ -126,6 +132,9 @@ Example:
 						 <1200000>, <1200000>,
 						 <1200000>, <1200000>;
 
+		s5m8767,pmic-buck9-uses-gpio;
+		s5m8767,pmic-buck9-gpio = <&gpk0 2 0>;
+
 		regulators {
 			ldo1_reg: LDO1 {
 				regulator-name = "VDD_ABB_3.3V";
@@ -148,5 +157,12 @@ 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 */
+			};
 		};
 	};
-- 
1.7.9.5

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