* FocalTech FT6236 I2C touchscreen controller

Required properties:
 - compatible		  : "focaltech,ft6236"
 - reg			  : I2C slave address of the chip (0x38)
 - interrupt-parent	  : a phandle pointing to the interrupt controller
			    serving the interrupt for this chip
 - interrupts		  : interrupt specification for the touch controller
			    interrupt
 - reset-gpios		  : GPIO specification for the RSTN input
 - touchscreen-size-x	  : horizontal resolution of touchscreen (in pixels)
 - touchscreen-size-y	  : vertical resolution of touchscreen (in pixels)

Optional properties:
 - touchscreen-fuzz-x	  : horizontal noise value of the absolute input
			    device (in pixels)
 - touchscreen-fuzz-y	  : vertical noise value of the absolute input
			    device (in pixels)
 - touchscreen-inverted-x : X axis is inverted (boolean)
 - touchscreen-inverted-y : Y axis is inverted (boolean)
 - touchscreen-swapped-x-y: X and Y axis are swapped (boolean)
			    Swapping is done after inverting the axis

Example:

	ft6x06@38 {
		compatible = "focaltech,ft6236";
		reg = <0x38>;
		interrupt-parent = <&gpio>;
		interrupts = <23 2>;
		touchscreen-size-x = <320>;
		touchscreen-size-y = <480>;
		touchscreen-inverted-x;
		touchscreen-swapped-x-y;
	};