Kernel-4.18.0-80.el8_brcm,iproc-gpio

Broadcom iProc GPIO/PINCONF Controller

Required properties:

• compatible:
  “brcm,iproc-gpio” for the generic iProc based GPIO controller IP that
  supports full-featured pinctrl and GPIO functions used in various iProc
  based SoCs

  May contain an SoC-specific compatibility string to accommodate any
  SoC-specific features

  “brcm,cygnus-ccm-gpio”, “brcm,cygnus-asiu-gpio”, or
  “brcm,cygnus-crmu-gpio” for Cygnus SoCs

  “brcm,iproc-nsp-gpio” for the iProc NSP SoC that has drive strength support
  disabled

  “brcm,iproc-stingray-gpio” for the iProc Stingray SoC that has the general
  pinctrl support completely disabled in this IP block. In Stingray, a
  different IP block is used to handle pinctrl related functions

• reg:
  Define the base and range of the I/O address space that contains SoC
  GPIO/PINCONF controller registers

• ngpios:
  Total number of in-use slots in GPIO controller

• #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

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:
gpio_ccm: gpio@1800a000 {
compatible = “brcm,cygnus-ccm-gpio”;
reg = <0x1800a000 0x50>,
<0x0301d164 0x20>;
ngpios = <24>;
#gpio-cells = <2>;
gpio-controller;
interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
interrupt-controller;

    touch_pins: touch_pins {
        pwr: pwr {
            pins = "gpio-0";
            drive-strength = <16>;
        };

        event: event {
            pins = "gpio-1";
            bias-pull-up;
        };
    };
};

gpio_asiu: gpio@180a5000 {
    compatible = "brcm,cygnus-asiu-gpio";
    reg = <0x180a5000 0x668>;
    ngpios = <146>;
    #gpio-cells = <2>;
    gpio-controller;
    interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
    interrupt-controller;
    gpio-ranges = <&pinctrl 0 42 1>,
            <&pinctrl 1 44 3>;
};

/*
 * Touchscreen that uses the CCM GPIO 0 and 1
 */
tsc {
    ...
    ...
    gpio-pwr = <&gpio_ccm 0 0>;
    gpio-event = <&gpio_ccm 1 0>;
};

/* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */
bluetooth {
    ...
    ...
    bcm,rfkill-bank-sel = <&gpio_asiu 5 1>
}