1* Atmel GPIO controller (PIO)
2
3Required properties:
4- compatible: "atmel,<chip>-gpio", where <chip> is at91rm9200 or at91sam9x5.
5- reg: Should contain GPIO controller registers location and length
6- interrupts: Should be the port interrupt shared by all the pins.
7- #gpio-cells: Should be two.  The first cell is the pin number and
8  the second cell is used to specify optional parameters (currently
9  unused).
10- gpio-controller: Marks the device node as a GPIO controller.
11
12Example:
13	pioA: gpio@fffff200 {
14		compatible = "atmel,at91rm9200-gpio";
15		reg = <0xfffff200 0x100>;
16		interrupts = <2 4>;
17		#gpio-cells = <2>;
18		gpio-controller;
19	};
20
21