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diff --git a/Documentation/devicetree/bindings/gpio/gpio-adnp.txt b/Documentation/devicetree/bindings/gpio/gpio-adnp.txt
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+++ b/Documentation/devicetree/bindings/gpio/gpio-adnp.txt
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+Avionic Design N-bit GPIO expander bindings
+
+Required properties:
+- compatible: should be "ad,gpio-adnp"
+- reg: The I2C slave address for this device.
+- interrupt-parent: phandle of the parent interrupt controller.
+- interrupts: Interrupt specifier for the controllers interrupt.
+- #gpio-cells: Should be 2. The first cell is the GPIO number and the
+  second cell is used to specify optional parameters:
+  - bit 0: polarity (0: normal, 1: inverted)
+- gpio-controller: Marks the device as a GPIO controller
+- nr-gpios: The number of pins supported by the controller.
+
+Example:
+
+        gpioext: gpio-controller@41 {
+                compatible = "ad,gpio-adnp";
+                reg = <0x41>;
+
+                interrupt-parent = <&gpio>;
+                interrupts = <160 1>;
+
+                gpio-controller;
+                #gpio-cells = <2>;
+
+                interrupt-controller;
+                #interrupt-cells = <2>;
+
+                nr-gpios = <64>;
+        };