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diff --git a/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.txt b/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.txt
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+++ b/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.txt
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+Samsung tm2-touchkey
+
+Required properties:
+- compatible: must be "cypress,tm2-touchkey"
+- reg: I2C address of the chip.
+- interrupts: interrupt to which the chip is connected (see interrupt
+	binding[0]).
+- vcc-supply : internal regulator output. 1.8V
+- vdd-supply : power supply for IC 3.3V
+
+[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+
+Example:
+	&i2c0 {
+		/* ... */
+
+		touchkey@20 {
+			compatible = "cypress,tm2-touchkey";
+			reg = <0x20>;
+			interrupt-parent = <&gpa3>;
+			interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
+			vcc-supply=<&ldo32_reg>;
+			vdd-supply=<&ldo33_reg>;
+		};
+	};