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
12optional properties:
13- #gpio-lines: Number of gpio if absent 32.
14
15
16Example:
17	pioA: gpio@fffff200 {
18		compatible = "atmel,at91rm9200-gpio";
19		reg = <0xfffff200 0x100>;
20		interrupts = <2 4>;
21		#gpio-cells = <2>;
22		gpio-controller;
23		#gpio-lines = <19>;
24	};
25
26