target/linux/ramips/patches-4.3/0026-DT-Add-documentation-for-gpio-ralink.patch

   1 From d410e5478c622c01fcf31427533df5f433df9146 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sun, 28 Jul 2013 19:45:30 +0200
   4 Subject: [PATCH 26/53] DT: Add documentation for gpio-ralink
   5
   6 Describe gpio-ralink binding.
   7
   8 Signed-off-by: John Crispin <blogic@openwrt.org>
   9 Cc: linux-mips@linux-mips.org
  10 Cc: devicetree@vger.kernel.org
  11 Cc: linux-gpio@vger.kernel.org
  12 ---
  13  .../devicetree/bindings/gpio/gpio-ralink.txt       |   40 ++++++++++++++++++++
  14  1 file changed, 40 insertions(+)
  15  create mode 100644 Documentation/devicetree/bindings/gpio/gpio-ralink.txt
  16
  17 diff --git a/Documentation/devicetree/bindings/gpio/gpio-ralink.txt b/Documentation/devicetree/bindings/gpio/gpio-ralink.txt
  18 new file mode 100644
  19 index 0000000..b4acf02
  20 --- /dev/null
  21 +++ b/Documentation/devicetree/bindings/gpio/gpio-ralink.txt
  22 @@ -0,0 +1,40 @@
  23 +Ralink SoC GPIO controller bindings
  24 +
  25 +Required properties:
  26 +- compatible:
  27 +  - "ralink,rt2880-gpio" for Ralink controllers
  28 +- #gpio-cells : Should be two.
  29 +  - first cell is the pin number
  30 +  - second cell is used to specify optional parameters (unused)
  31 +- gpio-controller : Marks the device node as a GPIO controller
  32 +- reg : Physical base address and length of the controller's registers
  33 +- interrupt-parent: phandle to the INTC device node
  34 +- interrupts : Specify the INTC interrupt number
  35 +- ralink,num-gpios : Specify the number of GPIOs
  36 +- ralink,register-map : The register layout depends on the GPIO bank and actual
  37 +               SoC type. Register offsets need to be in this order.
  38 +               [ INT, EDGE, RENA, FENA, DATA, DIR, POL, SET, RESET, TOGGLE ]
  39 +
  40 +Optional properties:
  41 +- ralink,gpio-base : Specify the GPIO chips base number
  42 +
  43 +Example:
  44 +
  45 +       gpio0: gpio@600 {
  46 +               compatible = "ralink,rt5350-gpio", "ralink,rt2880-gpio";
  47 +
  48 +               #gpio-cells = <2>;
  49 +               gpio-controller;
  50 +
  51 +               reg = <0x600 0x34>;
  52 +
  53 +               interrupt-parent = <&intc>;
  54 +               interrupts = <6>;
  55 +
  56 +               ralink,gpio-base = <0>;
  57 +               ralink,num-gpios = <24>;
  58 +               ralink,register-map = [ 00 04 08 0c
  59 +                               20 24 28 2c
  60 +                               30 34 ];
  61 +
  62 +       };
  63 --
  64 1.7.10.4
  65