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Draft: add the focaltech FTS touchscreen driver

Martin Kepplinger requested to merge martin.kepplinger/linux-next:fts_driver into next/byzantium

the commit messages should say it all, but to use the driver, we would now have to do:

		touchscreen@38 {
	-               compatible = "edt,edt-ft5506";
	+               compatible = "focaltech,fts";
			reg = <0x38>;
			pinctrl-names = "default";
			pinctrl-0 = <&pinctrl_touch>;
	@@ -1394,6 +1394,10 @@ touchscreen@38 {
			touchscreen-size-x = <720>;
			touchscreen-size-y = <1440>;
			vcc-supply = <&reg_lcd_1v8>;
	+               focaltech,irq-gpio = <&gpio1 27 GPIO_ACTIVE_HIGH>;
	+               focaltech,display-coords =  <0 0 720 1440>;
	+               focaltech,max-touch-number = <5>;
		};
	 };

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