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twl4030 GPIO controller bindings

Required properties:
- compatible:
  - "ti,twl4030-gpio" for twl4030 GPIO controller
- #gpio-cells : Should be two.
  - first cell is the pin number
  - second cell is used to specify optional parameters (unused)
- gpio-controller : Marks the device node as a GPIO controller.
- #interrupt-cells : Should be 2.
- interrupt-controller: Mark the device node as an interrupt controller
  The first cell is the GPIO number.
  The second cell is not used.

Example:

twl_gpio: gpio {
    compatible = "ti,twl4030-gpio";
    #gpio-cells = <2>;
    gpio-controller;
    #interrupt-cells = <2>;
    interrupt-controller;
};
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