Documentation/devicetree/bindings/gpio/ibm,ppc4xx-gpio.txt

   1 * IBM/AMCC/APM GPIO Controller for PowerPC 4XX series and compatible SoCs
   2
   3 All GPIOs are pin-shared with other functions. DCRs control whether a
   4 particular pin that has GPIO capabilities acts as a GPIO or is used for
   5 another purpose. GPIO outputs are separately programmable to emulate
   6 an open-drain driver.
   7
   8 Required properties:
   9         - compatible: must be "ibm,ppc4xx-gpio"
  10         - reg: address and length of the register set for the device
  11         - #gpio-cells: must be set to 2. The first cell is the pin number
  12                 and the second cell is used to specify the gpio polarity:
  13                 0 = active high
  14                 1 = active low
  15         - gpio-controller: marks the device node as a gpio controller.
  16
  17 Example:
  18
  19 GPIO0: gpio@ef600b00 {
  20         compatible = "ibm,ppc4xx-gpio";
  21         reg = <0xef600b00 0x00000048>;
  22         #gpio-cells = <2>;
  23         gpio-controller;
  24 };