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 to declare if the GPIO
9  is active high or low. See gpio.txt.
10- gpio-controller: Marks the device node as a GPIO controller.
11- interrupt-controller: Marks the device node as an interrupt controller.
12- #interrupt-cells: Should be two. The first cell is the pin number and the
13  second cell is used to specify irq type flags, see the two cell description
14  in interrupt-controller/interrupts.txt for details.
15
16optional properties:
17- #gpio-lines: Number of gpio if absent 32.
18
19
20Example:
21	pioA: gpio@fffff200 {
22		compatible = "atmel,at91rm9200-gpio";
23		reg = <0xfffff200 0x100>;
24		interrupts = <2 4>;
25		#gpio-cells = <2>;
26		gpio-controller;
27		#gpio-lines = <19>;
28		interrupt-controller;
29		#interrupt-cells = <2>;
30	};
31
32