linux-arkmicro/linux/Documentation/devicetree/bindings/gpio/gpio_oxnas.txt

* Oxford Semiconductor OXNAS SoC GPIO Controller

Please refer to gpio.txt for generic information regarding GPIO bindings.

Required properties:
 - compatible: "oxsemi,ox810se-gpio" or "oxsemi,ox820-gpio"
 - reg: Base address and length for the device.
 - interrupts: The port interrupt shared by all pins.
 - gpio-controller: Marks the port as GPIO controller.
 - #gpio-cells: Two. The first cell is the pin number and
   the second cell is used to specify the gpio polarity as defined in
   defined in <dt-bindings/gpio/gpio.h>:
      0 = GPIO_ACTIVE_HIGH
      1 = GPIO_ACTIVE_LOW
 - interrupt-controller: Marks the device node as an interrupt controller.
 - #interrupt-cells: Two. The first cell is the GPIO number and second cell
   is used to specify the trigger type as defined in
   <dt-bindings/interrupt-controller/irq.h>:
      IRQ_TYPE_EDGE_RISING
      IRQ_TYPE_EDGE_FALLING
      IRQ_TYPE_EDGE_BOTH
 - gpio-ranges: Interaction with the PINCTRL subsystem, it also specifies the
   gpio base and count, should be in the format of numeric-gpio-range as
   specified in the gpio.txt file.

Example:

gpio0: gpio@0 {
	compatible = "oxsemi,ox810se-gpio";
	reg = <0x000000 0x100000>;
	interrupts = <21>;
	#gpio-cells = <2>;
	gpio-controller;
	interrupt-controller;
	#interrupt-cells = <2>;
	gpio-ranges = <&pinctrl 0 0 32>;
};

keys {
	...

	button-esc {
		label = "ESC";
		linux,code = <1>;
		gpios = <&gpio0 12 0>;
	};
};