Add DT bindings documentation for Zinitix I2C Touchpad.
Signed-off-by: KwangDeok Son <kdson@xxxxxxxxxxx>
---
diff --git a/Documentation/devicetree/bindings/input/zinitix-touchpad.txt b/Documentation/devicetree/bindings/input/zinitix-touchpad.txt
index e69de29bb2d1..29a3fe9b58cb 100644
--- a/Documentation/devicetree/bindings/input/zinitix-touchpad.txt
+++ b/Documentation/devicetree/bindings/input/zinitix-touchpad.txt
@@ -0,0 +1,28 @@
+Zinitix I2C Touchpad
+
+
+Required properties:
+- compatible: must be "zinitix,zntxtp".
+- reg: I2C address of the chip.
+- interrupts: interrupt to which the chip is connected (see interrupt
+ binding[0]).
+
+
+Optional properties:
+- wakeup-source: touchpad can be used as a wakeup source.
+- vcc-supply: a phandle for the regulator supplying 2.7V to 3.6V power.
+
+[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+
+Example:
+ &i2c0 {
+ touchpad@40 {
+ compatible = "zinitix,zntxtp";
+ reg = <0x40>;
+ interrupt-parent = <&gpio>;
+ interrupts = <0 IRQ_TYPE_EDGE_FALLING>;
+ wakeup-source;
+ };
+ };
