1NXP LPC32xx SoC GPIO controller
2
3Required properties:
4- compatible: must be "nxp,lpc3220-gpio"
5- reg: Physical base address and length of the controller's registers.
6- gpio-controller: Marks the device node as a GPIO controller.
7- #gpio-cells: Should be 3:
8   1) bank:
9      0: GPIO P0
10      1: GPIO P1
11      2: GPIO P2
12      3: GPIO P3
13      4: GPI P3
14      5: GPO P3
15   2) pin number
16   3) optional parameters:
17      - bit 0 specifies polarity (0 for normal, 1 for inverted)
18- reg: Index of the GPIO group
19
20Example:
21
22	gpio: gpio@40028000 {
23		compatible = "nxp,lpc3220-gpio";
24		reg = <0x40028000 0x1000>;
25		gpio-controller;
26		#gpio-cells = <3>; /* bank, pin, flags */
27	};
28
29	leds {
30		compatible = "gpio-leds";
31
32		led0 {
33			gpios = <&gpio 5 1 1>; /* GPO_P3 1, active low */
34			linux,default-trigger = "heartbeat";
35			default-state = "off";
36		};
37
38		led1 {
39			gpios = <&gpio 5 14 1>; /* GPO_P3 14, active low */
40			linux,default-trigger = "timer";
41			default-state = "off";
42		};
43	};
44