Kernel-3.10.0-957.el7_cavium-octeon-gpio

• General Purpose Input Output (GPIO) bus.

Properties:

• compatible: “cavium,octeon-3860-gpio”

  Compatibility with all cn3XXX, cn5XXX and cn6XXX SOCs.

• reg: The base address of the GPIO unit’s register bank.

• gpio-controller: This is a GPIO controller.

• #gpio-cells: Must be <2>. The first cell is the GPIO pin.

• interrupt-controller: The GPIO controller is also an interrupt
  controller, many of its pins may be configured as an interrupt
  source.

• #interrupt-cells: Must be <2>. The first cell is the GPIO pin
  connected to the interrupt source. The second cell is the interrupt
  triggering protocol and may have one of four values:
  1 - edge triggered on the rising edge.
  2 - edge triggered on the falling edge
  4 - level triggered active high.
  8 - level triggered active low.

• interrupts: Interrupt routing for each pin.

Example:

gpio-controller@1070000000800 {
    #gpio-cells = <2>;
    compatible = "cavium,octeon-3860-gpio";
    reg = <0x10700 0x00000800 0x0 0x100>;
    gpio-controller;
    /* Interrupts are specified by two parts:
     * 1) GPIO pin number (0..15)
     * 2) Triggering (1 - edge rising
     *          2 - edge falling
     *          4 - level active high
     *          8 - level active low)
     */
    interrupt-controller;
    #interrupt-cells = <2>;
    /* The GPIO pin connect to 16 consecutive CUI bits */
    interrupts = <0 16>, <0 17>, <0 18>, <0 19>,
             <0 20>, <0 21>, <0 22>, <0 23>,
             <0 24>, <0 25>, <0 26>, <0 27>,
             <0 28>, <0 29>, <0 30>, <0 31>;
};