From af2b04d19242686a2c30e526c9b7a9e9c57bbce9 Mon Sep 17 00:00:00 2001 From: Sergio Paracuellos Date: Thu, 5 Jul 2018 15:43:11 +0200 Subject: gpio: mt7621: Add DT bindings Add a devicetree binding documentation for the mt7621 gpio. Signed-off-by: Sergio Paracuellos Reviewed-by: NeilBrown Reviewed-by: Rob Herring Signed-off-by: Linus Walleij --- .../bindings/gpio/mediatek,mt7621-gpio.txt | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt (limited to 'Documentation/devicetree/bindings/gpio') diff --git a/Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt b/Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt new file mode 100644 index 000000000000..ba455589f869 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt @@ -0,0 +1,35 @@ +Mediatek MT7621 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. Also the GPIO controller can receive +interrupts on any of the GPIOs, either edge or level. It then interrupts the CPU +using GIC INT12. + +Required properties for the top level node: +- #gpio-cells : Should be two. The first cell is the GPIO pin number and the + second cell specifies GPIO flags, as defined in . + Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported. +- #interrupt-cells : Specifies the number of cells needed to encode an + interrupt. Should be 2. The first cell defines the interrupt number, + the second encodes the triger flags encoded as described in + Documentation/devicetree/bindings/interrupt-controller/interrupts.txt +- compatible: + - "mediatek,mt7621-gpio" for Mediatek controllers +- reg : Physical base address and length of the controller's registers +- interrupt-parent : phandle of the parent interrupt controller. +- interrupts : Interrupt specifier for the controllers interrupt. +- interrupt-controller : Mark the device node as an interrupt controller. +- gpio-controller : Marks the device node as a GPIO controller. + +Example: + gpio@600 { + #gpio-cells = <2>; + #interrupt-cells = <2>; + compatible = "mediatek,mt7621-gpio"; + gpio-controller; + interrupt-controller; + reg = <0x600 0x100>; + interrupt-parent = <&gic>; + interrupts = ; + }; -- cgit v1.2.3-59-g8ed1b