xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/gpio/intel,ixp4xx-gpio.txt

Intel IXP4xx XScale Networking Processors GPIO

This GPIO controller is found in the Intel IXP4xx processors.
It supports 16 GPIO lines.

The interrupt portions of the GPIO controller is hierarchical:
the synchronous edge detector is part of the GPIO block, but the
actual enabling/disabling of the interrupt line is done in the
main IXP4xx interrupt controller which has a 1:1 mapping for
the first 12 GPIO lines to 12 system interrupts.

The remaining 4 GPIO lines can not be used for receiving
interrupts.

The interrupt parent of this GPIO controller must be the
IXP4xx interrupt controller.

Required properties:

- compatible : Should be
  "intel,ixp4xx-gpio"
- reg : Should contain registers location and length
- gpio-controller : marks this as a GPIO controller
- #gpio-cells : Should be 2, see gpio/gpio.txt
- interrupt-controller : marks this as an interrupt controller
- #interrupt-cells : a standard two-cell interrupt, see
  interrupt-controller/interrupts.txt

Example:

gpio0: gpio@c8004000 {
	compatible = "intel,ixp4xx-gpio";
	reg = <0xc8004000 0x1000>;
	gpio-controller;
	#gpio-cells = <2>;
	interrupt-controller;
	#interrupt-cells = <2>;
};