Commit af315a5b authored by Sergio Paracuellos's avatar Sergio Paracuellos Committed by Greg Kroah-Hartman
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staging: mt7621-gpio: dt-bindings: add documentation for mt7621-gpio 



This commit add missing dt bindings documentation for mt7621-gpio
driver. There is some missing stuff here about interrupts with is
not also being used in the mt7621.dtsi file. So just include in
staging a incomplete version before moving this to kernel's dt-bindings
place.

Signed-off-by: default avatarSergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: default avatarNeilBrown <neil@brown.name>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 55dee963

drivers/staging/mt7621-gpio/mediatek,mt7621-gpio.txt

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Mediatek SoC GPIO controller bindings



The IP core used inside these SoCs has 3 banks of 32 GPIOs each.

The registers of all the banks are interwoven inside one single IO range.

We load one GPIO controller instance per bank. To make this possible

we support 2 types of nodes. The parent node defines the memory I/O range and

has 3 children each describing a single bank.



Required properties for the top level node:

- compatible:

  - "mediatek,mt7621-gpio" for Mediatek controllers

- reg : Physical base address and length of the controller's registers



Required properties for the GPIO bank node:

- compatible:

  - "mediatek,mt7621-gpio-bank" for Mediatek banks

- #gpio-cells : Should be two.

  - first cell is the pin number

  - second cell is used to specify optional parameters (unused)

- gpio-controller : Marks the device node as a GPIO controller

- reg : The id of the bank that the node describes.



Example:

	gpio@600 {

		#address-cells = <1>;

		#size-cells = <0>;



		compatible = "mediatek,mt7621-gpio";

		reg = <0x600 0x100>;



		gpio0: bank@0 {

			reg = <0>;

			compatible = "mediatek,mt7621-gpio-bank";

			gpio-controller;

			#gpio-cells = <2>;

		};



		gpio1: bank@1 {

			reg = <1>;

			compatible = "mediatek,mt7621-gpio-bank";

			gpio-controller;

			#gpio-cells = <2>;

		};



		gpio2: bank@2 {

			reg = <2>;

			compatible = "mediatek,mt7621-gpio-bank";

			gpio-controller;

			#gpio-cells = <2>;

		};

	};