Kernel-4.18.0-80.el8_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";
    };
};