| From d410e5478c622c01fcf31427533df5f433df9146 Mon Sep 17 00:00:00 2001 |
| From: John Crispin <blogic@openwrt.org> |
| Date: Sun, 28 Jul 2013 19:45:30 +0200 |
| Subject: [PATCH 26/53] DT: Add documentation for gpio-ralink |
| |
| Describe gpio-ralink binding. |
| |
| Signed-off-by: John Crispin <blogic@openwrt.org> |
| Cc: linux-mips@linux-mips.org |
| Cc: devicetree@vger.kernel.org |
| Cc: linux-gpio@vger.kernel.org |
| --- |
| .../devicetree/bindings/gpio/gpio-ralink.txt | 40 ++++++++++++++++++++ |
| 1 file changed, 40 insertions(+) |
| create mode 100644 Documentation/devicetree/bindings/gpio/gpio-ralink.txt |
| |
| --- /dev/null |
| +++ b/Documentation/devicetree/bindings/gpio/gpio-ralink.txt |
| @@ -0,0 +1,40 @@ |
| +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 |
| +- ralink,num-gpios : 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 ] |
| + |
| +Optional properties: |
| +- ralink,gpio-base : Specify the GPIO chips base number |
| + |
| +Example: |
| + |
| + gpio0: gpio@600 { |
| + compatible = "ralink,rt5350-gpio", "ralink,rt2880-gpio"; |
| + |
| + #gpio-cells = <2>; |
| + gpio-controller; |
| + |
| + reg = <0x600 0x34>; |
| + |
| + interrupt-parent = <&intc>; |
| + interrupts = <6>; |
| + |
| + ralink,gpio-base = <0>; |
| + ralink,num-gpios = <24>; |
| + ralink,register-map = [ 00 04 08 0c |
| + 20 24 28 2c |
| + 30 34 ]; |
| + |
| + }; |