mfd: max77693: Update DT binding to support haptic

This patch add haptic DT binding documentation and example
to support haptic driver in max77693 Multifunction device.

Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mfd/max77693.txt b/Documentation/devicetree/bindings/mfd/max77693.txt
index 11921cc417bf..01e9f30fe678 100644
--- a/Documentation/devicetree/bindings/mfd/max77693.txt
+++ b/Documentation/devicetree/bindings/mfd/max77693.txt
@@ -27,6 +27,20 @@ Optional properties:
 
         [*] refer Documentation/devicetree/bindings/regulator/regulator.txt
 
+- haptic : The MAX77693 haptic device utilises a PWM controlled motor to provide
+  users with tactile feedback. PWM period and duty-cycle are varied in
+  order to provide the approprite level of feedback.
+
+ Required properties:
+        - compatible : Must be "maxim,max77693-hpatic"
+        - haptic-supply : power supply for the haptic motor
+        [*] refer Documentation/devicetree/bindings/regulator/regulator.txt
+        - pwms : phandle to the physical PWM(Pulse Width Modulation) device.
+         PWM properties should be named "pwms". And number of cell is different
+         for each pwm device.
+         To get more informations, please refer to documentaion.
+        [*] refer Documentation/devicetree/bindings/pwm/pwm.txt
+
 Example:
         max77693@66 {
                 compatible = "maxim,max77693";
@@ -52,4 +66,11 @@ Example:
                                         regulator-boot-on;
                         };
                 };
+
+                haptic {
+                        compatible = "maxim,max77693-haptic";
+                        haptic-supply = <&haptic_supply>;
+                        pwms = <&pwm 0 40000 0>;
+                        pwm-names = "haptic";
+                };
         };