Kernel-4.18.0-80.el8_brcm,nsp-gpio

Broadcom Northstar plus (NSP) GPIO/PINCONF Controller

Required properties:

• compatible:
  Must be “brcm,nsp-gpio-a”

• reg:
  Should contain the register physical address and length for each of
  GPIO base, IO control registers

• #gpio-cells:
  Must be two. The first cell is the GPIO pin number (within the
  controller’s pin space) and the second cell is used for the following:
  bit[0]: polarity (0 for active high and 1 for active low)

• gpio-controller:
  Specifies that the node is a GPIO controller

• ngpios:
  Number of gpios supported (58x25 supports 32 and 58x23 supports 24)

Optional properties:

• interrupts:
  Interrupt ID

• interrupt-controller:
  Specifies that the node is an interrupt controller

• gpio-ranges:
  Specifies the mapping between gpio controller and pin-controllers pins.
  This requires 4 fields in cells defined as -

  1. Phandle of pin-controller.
  2. GPIO base pin offset.
     3 Pin-control base pin offset.
  3. number of gpio pins which are linearly mapped from pin base.

Supported generic PINCONF properties in child nodes:

• pins:
  The list of pins (within the controller’s own pin space) that properties
  in the node apply to. Pin names are “gpio-“

• bias-disable:
  Disable pin bias

• bias-pull-up:
  Enable internal pull up resistor

• bias-pull-down:
  Enable internal pull down resistor

• drive-strength:
  Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)

Example:

gpioa: gpio@18000020 {
    compatible = "brcm,nsp-gpio-a";
    reg = <0x18000020 0x100>,
          <0x1803f1c4 0x1c>;
    #gpio-cells = <2>;
    gpio-controller;
    ngpios = <32>;
    gpio-ranges = <&pinctrl 0 0 31>;
    interrupt-controller;
    interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;

    /* Hog a few default settings */
    pinctrl-names = "default";
    pinctrl-0 = <&led>;
    led: led {
        pins = "gpio-1";
        bias-pull-up;
    };

    pwr: pwr {
        gpio-hog;
        gpios = <3 1>;
        output-high;
    };
};