NXP LPC32xx SoC GPIO controller
|
|
Required properties:
|
- compatible: must be "nxp,lpc3220-gpio"
|
- reg: Physical base address and length of the controller's registers.
|
- gpio-controller: Marks the device node as a GPIO controller.
|
- #gpio-cells: Should be 3:
|
1) bank:
|
0: GPIO P0
|
1: GPIO P1
|
2: GPIO P2
|
3: GPIO P3
|
4: GPI P3
|
5: GPO P3
|
2) pin number
|
3) optional parameters:
|
- bit 0 specifies polarity (0 for normal, 1 for inverted)
|
- reg: Index of the GPIO group
|
|
Example:
|
|
gpio: gpio@40028000 {
|
compatible = "nxp,lpc3220-gpio";
|
reg = <0x40028000 0x1000>;
|
gpio-controller;
|
#gpio-cells = <3>; /* bank, pin, flags */
|
};
|
|
leds {
|
compatible = "gpio-leds";
|
|
led0 {
|
gpios = <&gpio 5 1 1>; /* GPO_P3 1, active low */
|
linux,default-trigger = "heartbeat";
|
default-state = "off";
|
};
|
|
led1 {
|
gpios = <&gpio 5 14 1>; /* GPO_P3 14, active low */
|
linux,default-trigger = "timer";
|
default-state = "off";
|
};
|
};
|
