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diff --git a/Documentation/devicetree/bindings/input/gpio-decoder.txt b/Documentation/devicetree/bindings/input/gpio-decoder.txt
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+++ b/Documentation/devicetree/bindings/input/gpio-decoder.txt
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+* GPIO Decoder DT bindings
+
+Required Properties:
+- compatible: should be "gpio-decoder"
+- gpios: a spec of gpios (at least two) to be decoded to a number with
+  first entry representing the MSB.
+
+Optional Properties:
+- decoder-max-value: Maximum possible value that can be reported by
+  the gpios.
+- linux,axis: the input subsystem axis to map to (ABS_X/ABS_Y).
+  Defaults to 0 (ABS_X).
+
+Example:
+	gpio-decoder0 {
+		compatible = "gpio-decoder";
+		gpios = <&pca9536 3 GPIO_ACTIVE_HIGH>,
+			<&pca9536 2 GPIO_ACTIVE_HIGH>,
+			<&pca9536 1 GPIO_ACTIVE_HIGH>,
+			<&pca9536 0 GPIO_ACTIVE_HIGH>;
+		linux,axis = <0>; /* ABS_X */
+		decoder-max-value = <9>;
+	};