Kernel-4.18.0-80.el8_gpio-zynq

Xilinx Zynq GPIO controller Device Tree Bindings

Required properties:

  • #gpio-cells : Should be two
            - First cell is the GPIO line number
            - Second cell is used to specify optional
              parameters (unused)
    
  • compatible : Should be “xlnx,zynq-gpio-1.0” or “xlnx,zynqmp-gpio-1.0”
  • clocks : Clock specifier (see clock bindings for details)
  • gpio-controller : Marks the device node as a GPIO controller.
  • interrupts : Interrupt specifier (see interrupt bindings for
            details)
    
  • interrupt-parent : Must be core interrupt controller
  • interrupt-controller : Marks the device node as an interrupt controller.
  • #interrupt-cells : Should be 2. The first cell is the GPIO number.
            The second cell bits[3:0] is used to specify trigger type and level flags:
                1 = low-to-high edge triggered.
                2 = high-to-low edge triggered.
                4 = active high level-sensitive.
                8 = active low level-sensitive.
    
  • reg : Address and length of the register set for the device

Example:
gpio@e000a000 {
#gpio-cells = <2>;
compatible = “xlnx,zynq-gpio-1.0”;
clocks = <&clkc 42>;
gpio-controller;
interrupt-parent = <&intc>;
interrupts = <0 20 4>;
interrupt-controller;
#interrupt-cells = <2>;
reg = <0xe000a000 0x1000>;
};