Documentation/devicetree/bindings/gpio/gpio-omap.txt

   1 OMAP GPIO controller bindings
   2
   3 Required properties:
   4 - compatible:
   5   - "ti,omap2-gpio" for OMAP2 controllers
   6   - "ti,omap3-gpio" for OMAP3 controllers
   7   - "ti,omap4-gpio" for OMAP4 controllers
   8 - gpio-controller : Marks the device node as a GPIO controller.
   9 - #gpio-cells : Should be two.
  10   - first cell is the pin number
  11   - second cell is used to specify optional parameters (unused)
  12 - interrupt-controller: Mark the device node as an interrupt 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
  22 OMAP specific properties:
  23 - ti,hwmods:            Name of the hwmod associated to the GPIO:
  24                         "gpio<X>", <X> being the 1-based instance number
  25                         from the HW spec.
  26 - ti,gpio-always-on:    Indicates if a GPIO bank is always powered and
  27                         so will never lose its logic state.
  28
  29
  30 Example:
  31
  32 gpio4: gpio4 {
  33     compatible = "ti,omap4-gpio";
  34     ti,hwmods = "gpio4";
  35     gpio-controller;
  36     #gpio-cells = <2>;
  37     interrupt-controller;
  38     #interrupt-cells = <2>;
  39 };