From: John Crispin Date: Sun, 28 Jul 2013 19:45:30 +0200 Subject: [PATCH 1/2] DT: Add documentation for gpio-ralink Describe gpio-ralink binding. Signed-off-by: John Crispin --- .../devicetree/bindings/gpio/gpio-ralink.txt | 42 +++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-ralink.txt --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-ralink.txt @@ -0,0 +1,42 @@ +Ralink SoC GPIO controller bindings + +Required properties: +- compatible: + - "ralink,rt2880-gpio" for Ralink controllers +- #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 : Physical base address and length of the controller's registers +- interrupt-parent: phandle to the INTC device node +- interrupts : Specify the INTC interrupt number +- ngpios : Specify the number of GPIOs +- ralink,register-map : The register layout depends on the GPIO bank and actual + SoC type. Register offsets need to be in this order. + [ INT, EDGE, RENA, FENA, DATA, DIR, POL, SET, RESET, TOGGLE ] +- interrupt-controller : marks this as an interrupt controller +- #interrupt-cells : a standard two-cell interrupt flag, see + interrupt-controller/interrupts.txt + +Example: + + gpio0: gpio@600 { + compatible = "ralink,rt2880-gpio"; + + #gpio-cells = <2>; + gpio-controller; + + reg = <0x600 0x34>; + + interrupt-controller; + #interrupt-cells = <2>; + + interrupt-parent = <&intc>; + interrupts = <6>; + + ngpios = <24>; + ralink,register-map = [ 00 04 08 0c + 20 24 28 2c + 30 34 ]; + + };