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- From: John Crispin <[email protected]>
- 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 <[email protected]>
- ---
- .../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 ];
- +
- + };
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