Kernel-3.10.0-957.el7_gpio_lpc32xx

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";
    };
};