Kernel-4.18.0-80.el8_gpio-axp209

AXP209 GPIO & pinctrl controller

This driver follows the usual GPIO bindings found in
Documentation/devicetree/bindings/gpio/gpio.txt

This driver follows the usual pinctrl bindings found in
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

This driver employs the per-pin muxing pattern.

Required properties:

• compatible: Should be one of:
  • “x-powers,axp209-gpio”
  • “x-powers,axp813-gpio”
• #gpio-cells: Should be two. The first cell is the pin number and the
  second is the GPIO flags.
• gpio-controller: Marks the device node as a GPIO controller.

This node must be a subnode of the axp20x PMIC, documented in
Documentation/devicetree/bindings/mfd/axp20x.txt

Example:

axp209: pmic@34 {
compatible = “x-powers,axp209”;
reg = <0x34>;
interrupt-parent = <&nmi_intc>;
interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
interrupt-controller;
#interrupt-cells = <1>;

axp_gpio: gpio {
    compatible = "x-powers,axp209-gpio";
    gpio-controller;
    #gpio-cells = <2>;
};

};

The GPIOs can be muxed to other functions and therefore, must be a subnode of
axp_gpio.

Example:

&axp_gpio {
gpio0_adc: gpio0-adc {
pins = “GPIO0”;
function = “adc”;
};
};

&example_node {
pinctrl-names = “default”;
pinctrl-0 = <&gpio0_adc>;
};

GPIOs and their functions

Each GPIO is independent from the other (i.e. GPIO0 in gpio_in function does
not force GPIO1 and GPIO2 to be in gpio_in function as well).

axp209

GPIO | Functions

GPIO0 | gpio_in, gpio_out, ldo, adc
GPIO1 | gpio_in, gpio_out, ldo, adc
GPIO2 | gpio_in, gpio_out

axp813

GPIO | Functions

GPIO0 | gpio_in, gpio_out, ldo, adc
GPIO1 | gpio_in, gpio_out, ldo