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diff --git a/Bindings/gpio/gpio_atmel.txt b/Bindings/gpio/gpio_atmel.txt
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+* Atmel GPIO controller (PIO)
+
+Required properties:
+- compatible: "atmel,<chip>-gpio", where <chip> is at91rm9200 or at91sam9x5.
+- reg: Should contain GPIO controller registers location and length
+- interrupts: Should be the port interrupt shared by all the pins.
+- #gpio-cells: Should be two. The first cell is the pin number and
+ the second cell is used to specify optional parameters to declare if the GPIO
+ is active high or low. See gpio.txt.
+- gpio-controller: Marks the device node as a GPIO controller.
+- interrupt-controller: Marks the device node as an interrupt controller.
+- #interrupt-cells: Should be two. The first cell is the pin number and the
+ second cell is used to specify irq type flags, see the two cell description
+ in interrupt-controller/interrupts.txt for details.
+
+optional properties:
+- #gpio-lines: Number of gpio if absent 32.
+
+
+Example:
+ pioA: gpio@fffff200 {
+ compatible = "atmel,at91rm9200-gpio";
+ reg = <0xfffff200 0x100>;
+ interrupts = <2 4>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ #gpio-lines = <19>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ };
+