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

   1 Xilinx Zynq GPIO controller Device Tree Bindings
   2 -------------------------------------------
   3
   4 Required properties:
   5 - #gpio-cells           : Should be two
   6                           - First cell is the GPIO line number
   7                           - Second cell is used to specify optional
   8                             parameters (unused)
   9 - compatible            : Should be "xlnx,zynq-gpio-1.0" or "xlnx,zynqmp-gpio-1.0"
  10 - clocks                : Clock specifier (see clock bindings for details)
  11 - gpio-controller       : Marks the device node as a GPIO controller.
  12 - interrupts            : Interrupt specifier (see interrupt bindings for
  13                           details)
  14 - interrupt-parent      : Must be core interrupt controller
  15 - interrupt-controller  : Marks the device node as an interrupt controller.
  16 - #interrupt-cells      : Should be 2.  The first cell is the GPIO number.
  17                           The second cell bits[3:0] is used to specify trigger type and level flags:
  18                               1 = low-to-high edge triggered.
  19                               2 = high-to-low edge triggered.
  20                               4 = active high level-sensitive.
  21                               8 = active low level-sensitive.
  22 - reg                   : Address and length of the register set for the device
  23
  24 Example:
  25         gpio@e000a000 {
  26                 #gpio-cells = <2>;
  27                 compatible = "xlnx,zynq-gpio-1.0";
  28                 clocks = <&clkc 42>;
  29                 gpio-controller;
  30                 interrupt-parent = <&intc>;
  31                 interrupts = <0 20 4>;
  32                 interrupt-controller;
  33                 #interrupt-cells = <2>;
  34                 reg = <0xe000a000 0x1000>;
  35         };