Documentation/devicetree/bindings/gpio/wd,mbl-gpio.txt

   1 Bindings for the Western Digital's MyBook Live memory-mapped GPIO controllers.
   2
   3 The Western Digital MyBook Live has two memory-mapped GPIO controllers.
   4 Both GPIO controller only have a single 8-bit data register, where GPIO
   5 state can be read and/or written.
   6
   7 Required properties:
   8         - compatible: should be "wd,mbl-gpio"
   9         - reg-names: must contain
  10                 "dat" - data register
  11         - reg: address + size pairs describing the GPIO register sets;
  12                 order must correspond with the order of entries in reg-names
  13         - #gpio-cells: must be set to 2. The first cell is the pin number and
  14                         the second cell is used to specify the gpio polarity:
  15                         0 = active high
  16                         1 = active low
  17         - gpio-controller: Marks the device node as a gpio controller.
  18
  19 Optional properties:
  20         - no-output: GPIOs are read-only.
  21
  22 Examples:
  23         gpio0: gpio0@e0000000 {
  24                 compatible = "wd,mbl-gpio";
  25                 reg-names = "dat";
  26                 reg = <0xe0000000 0x1>;
  27                 #gpio-cells = <2>;
  28                 gpio-controller;
  29         };
  30
  31         gpio1: gpio1@e0100000 {
  32                 compatible = "wd,mbl-gpio";
  33                 reg-names = "dat";
  34                 reg = <0xe0100000 0x1>;
  35                 #gpio-cells = <2>;
  36                 gpio-controller;
  37                 no-output;
  38         };