* Renesas R-Car GPIO Controller

Required Properties:

  - compatible: should contain one or more of the following:
    - "renesas,gpio-r8a7743": for R8A7743 (RZ/G1M) compatible GPIO controller.
    - "renesas,gpio-r8a7744": for R8A7744 (RZ/G1N) compatible GPIO controller.
    - "renesas,gpio-r8a7745": for R8A7745 (RZ/G1E) compatible GPIO controller.
    - "renesas,gpio-r8a77470": for R8A77470 (RZ/G1C) compatible GPIO controller.
    - "renesas,gpio-r8a774a1": for R8A774A1 (RZ/G2M) compatible GPIO controller.
    - "renesas,gpio-r8a7778": for R8A7778 (R-Car M1) compatible GPIO controller.
    - "renesas,gpio-r8a7779": for R8A7779 (R-Car H1) compatible GPIO controller.
    - "renesas,gpio-r8a7790": for R8A7790 (R-Car H2) compatible GPIO controller.
    - "renesas,gpio-r8a7791": for R8A7791 (R-Car M2-W) compatible GPIO controller.
    - "renesas,gpio-r8a7792": for R8A7792 (R-Car V2H) compatible GPIO controller.
    - "renesas,gpio-r8a7793": for R8A7793 (R-Car M2-N) compatible GPIO controller.
    - "renesas,gpio-r8a7794": for R8A7794 (R-Car E2) compatible GPIO controller.
    - "renesas,gpio-r8a7795": for R8A7795 (R-Car H3) compatible GPIO controller.
    - "renesas,gpio-r8a7796": for R8A7796 (R-Car M3-W) compatible GPIO controller.
    - "renesas,gpio-r8a77965": for R8A77965 (R-Car M3-N) compatible GPIO controller.
    - "renesas,gpio-r8a77970": for R8A77970 (R-Car V3M) compatible GPIO controller.
    - "renesas,gpio-r8a77980": for R8A77980 (R-Car V3H) compatible GPIO controller.
    - "renesas,gpio-r8a77990": for R8A77990 (R-Car E3) compatible GPIO controller.
    - "renesas,gpio-r8a77995": for R8A77995 (R-Car D3) compatible GPIO controller.
    - "renesas,rcar-gen1-gpio": for a generic R-Car Gen1 GPIO controller.
    - "renesas,rcar-gen2-gpio": for a generic R-Car Gen2 or RZ/G1 GPIO controller.
    - "renesas,rcar-gen3-gpio": for a generic R-Car Gen3 or RZ/G2 GPIO controller.
    - "renesas,gpio-rcar": deprecated.

    When compatible with the generic version nodes must list the
    SoC-specific version corresponding to the platform first followed by
    the generic version.

  - reg: Base address and length of each memory resource used by the GPIO
    controller hardware module.

  - interrupts: Interrupt specifier for the controllers interrupt.

  - gpio-controller: Marks the device node as a gpio controller.
  - #gpio-cells: Should be 2. The first cell is the GPIO number and the second
    cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>. Only the
    GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
  - gpio-ranges: See gpio.txt.

Optional properties:

  - clocks: Must contain a reference to the functional clock.  The property is
    mandatory if the hardware implements a controllable functional clock for
    the GPIO instance.

  - gpio-reserved-ranges: See gpio.txt.

Please refer to gpio.txt in this directory for the common GPIO bindings used by
client devices.

The GPIO controller also acts as an interrupt controller. It uses the default
two cells specifier as described in Documentation/devicetree/bindings/
interrupt-controller/interrupts.txt.

Example: R8A77470 (RZ/G1C) GPIO controller nodes

       gpio0: gpio@e6050000 {
                compatible = "renesas,gpio-r8a77470",
                             "renesas,rcar-gen2-gpio";
                reg = <0 0xe6050000 0 0x50>;
                interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
                #gpio-cells = <2>;
                gpio-controller;
                gpio-ranges = <&pfc 0 0 23>;
                #interrupt-cells = <2>;
                interrupt-controller;
                clocks = <&cpg CPG_MOD 912>;
                power-domains = <&sysc R8A77470_PD_ALWAYS_ON>;
                resets = <&cpg 912>;
        };
	...
       gpio3: gpio@e6053000 {
                compatible = "renesas,gpio-r8a77470",
                             "renesas,rcar-gen2-gpio";
                reg = <0 0xe6053000 0 0x50>;
                interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
                #gpio-cells = <2>;
                gpio-controller;
                gpio-ranges = <&pfc 0 96 30>;
                gpio-reserved-ranges = <17 10>;
                #interrupt-cells = <2>;
                interrupt-controller;
                clocks = <&cpg CPG_MOD 909>;
                power-domains = <&sysc R8A77470_PD_ALWAYS_ON>;
                resets = <&cpg 909>;
        };
