Documentation/devicetree/bindings/gpio/gpio_nvidia.txt

   1 NVIDIA Tegra GPIO controller
   2
   3 Required properties:
   4 - compatible : "nvidia,tegra<chip>-gpio"
   5 - reg : Physical base address and length of the controller's registers.
   6 - interrupts : The interrupt outputs from the controller. For Tegra20,
   7   there should be 7 interrupts specified, and for Tegra30, there should
   8   be 8 interrupts specified.
   9 - #gpio-cells : Should be two. The first cell is the pin number and the
  10   second cell is used to specify optional parameters:
  11   - bit 0 specifies polarity (0 for normal, 1 for inverted)
  12 - gpio-controller : Marks the device node as a GPIO controller.
  13 - #interrupt-cells : Should be 2.
  14   The first cell is the GPIO number.
  15   The second cell is used to specify flags:
  16     bits[3:0] trigger type and level flags:
  17       1 = low-to-high edge triggered.
  18       2 = high-to-low edge triggered.
  19       4 = active high level-sensitive.
  20       8 = active low level-sensitive.
  21       Valid combinations are 1, 2, 3, 4, 8.
  22 - interrupt-controller : Marks the device node as an interrupt controller.
  23
  24 Example:
  25
  26 gpio: gpio@6000d000 {
  27         compatible = "nvidia,tegra20-gpio";
  28         reg = < 0x6000d000 0x1000 >;
  29         interrupts = < 0 32 0x04
  30                        0 33 0x04
  31                        0 34 0x04
  32                        0 35 0x04
  33                        0 55 0x04
  34                        0 87 0x04
  35                        0 89 0x04 >;
  36         #gpio-cells = <2>;
  37         gpio-controller;
  38         #interrupt-cells = <2>;
  39         interrupt-controller;
  40 };