* Elan eKTF2127 I2C touchscreen controller

Required properties:
 - compatible		  : "elan,ektf2127" or "elan,ektf2132"
 - reg			  : I2C slave address of the chip (0x40)
 - interrupts		  : interrupt specification for the ektf2127 interrupt
 - power-gpios		  : GPIO specification for the pin connected to the
			    ektf2127's wake input. This needs to be driven high
			    to take ektf2127 out of it's low power state

For additional optional properties see: touchscreen.txt

Example:

i2c@00000000 {
	ektf2127: touchscreen@15 {
		compatible = "elan,ektf2127";
		reg = <0x15>;
		interrupt-parent = <&pio>;
		interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>
		power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
		touchscreen-inverted-x;
		touchscreen-swapped-x-y;
	};
};