regulator: max77686: Document gpio properties

Document usage of maxim,ena-gpios properties which turn on external/GPIO
control over regulator.

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

diff --git a/Documentation/devicetree/bindings/mfd/max77686.txt b/Documentation/devicetree/bindings/mfd/max77686.txt
index 75fdfaf41831d9fcd76be1b5706dadf1e2a2cb7d..e39f0bc1f55e02ccd705b85ae96714fd0a7e5263 100644 (file)
--- a/Documentation/devicetree/bindings/mfd/max77686.txt
+++ b/Documentation/devicetree/bindings/mfd/max77686.txt
@@ -39,6 +39,12 @@ to get matched with their hardware counterparts as follow:
        -BUCKn  :       1-4.
   Use standard regulator bindings for it ('regulator-off-in-suspend').
 
+  LDO20, LDO21, LDO22, BUCK8 and BUCK9 can be configured to GPIO enable
+  control. To turn this feature on this property must be added to the regulator
+  sub-node:
+       - maxim,ena-gpios :     one GPIO specifier enable control (the gpio
+                               flags are actually ignored and always
+                               ACTIVE_HIGH is used)
 
 Example:
 
@@ -65,4 +71,12 @@ Example:
                                regulator-always-on;
                                regulator-boot-on;
                        };
+
+                       buck9_reg {
+                               regulator-compatible = "BUCK9";
+                               regulator-name = "CAM_ISP_CORE_1.2V";
+                               regulator-min-microvolt = <1000000>;
+                               regulator-max-microvolt = <1200000>;
+                               maxim,ena-gpios = <&gpm0 3 GPIO_ACTIVE_HIGH>;
+                       };
        }