1* Freescale i.MX/MXC GPIO controller
2
3Required properties:
4- compatible : Should be "fsl,<soc>-gpio"
5- reg : Address and length of the register set for the device
6- interrupts : Should be the port interrupt shared by all 32 pins, if
7  one number.  If two numbers, the first one is the interrupt shared
8  by low 16 pins and the second one is for high 16 pins.
9- gpio-controller : Marks the device node as a gpio controller.
10- #gpio-cells : Should be two.  The first cell is the pin number and
11  the second cell is used to specify the gpio polarity:
12      0 = active high
13      1 = active low
14- interrupt-controller: Marks the device node as an interrupt controller.
15- #interrupt-cells : Should be 2.  The first cell is the GPIO number.
16  The second cell bits[3:0] is used to specify trigger type and level flags:
17      1 = low-to-high edge triggered.
18      2 = high-to-low edge triggered.
19      4 = active high level-sensitive.
20      8 = active low level-sensitive.
21
22Example:
23
24gpio0: gpio@73f84000 {
25	compatible = "fsl,imx51-gpio", "fsl,imx35-gpio";
26	reg = <0x73f84000 0x4000>;
27	interrupts = <50 51>;
28	gpio-controller;
29	#gpio-cells = <2>;
30	interrupt-controller;
31	#interrupt-cells = <2>;
32};
33