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Palmas GPIO controller bindings

Required properties:
- compatible:
  - "ti,palams-gpio" for palma series of the GPIO controller
  - "ti,tps80036-gpio" for Palma series device TPS80036.
  - "ti,tps65913-gpio" for palma series device TPS65913.
  - "ti,tps65914-gpio" for palma series device TPS65914.
- #gpio-cells : Should be two.
  - first cell is the gpio pin number
  - second cell is used to specify the gpio polarity:
      0 = active high
      1 = active low
- gpio-controller : Marks the device node as a GPIO controller.

Note: This gpio node will be sub node of palmas node.

Example:
	palmas: tps65913@58 {
		:::::::::::
		palmas_gpio: palmas_gpio {
			compatible = "ti,palmas-gpio";
			gpio-controller;
			#gpio-cells = <2>;
		};
		:::::::::::
	};

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