ARM: dts: rockchip: add focaltech touchscreen to rk3188-bqedison2qc

The Edison tablet uses a Focaltech touchscreen, with one speciality
that the touchscreen resolution doesn't match the display resolution
(1024x768 vs. 1280x600) which userspace will have to compensate for.
Signed-off-by: Heiko Stuebner <heiko.stuebner@bq.com>

arch/arm/boot/dts/rk3188-bqedison2qc.dts

@@ -408,6 +408,21 @@ bq24196: charger@6b {
 &i2c2 {
 	clock-frequency = <400000>;
 	status = "okay";
+
+	ft5606: touchscreen@3e {
+		compatible = "edt,edt-ft5506";
+		reg = <0x3e>;
+		interrupt-parent = <&gpio1>;
+		interrupts = <RK_PB7 IRQ_TYPE_EDGE_FALLING>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&tp_int &tp_rst>;
+		reset-gpios = <&gpio0 RK_PB6 GPIO_ACTIVE_LOW>;
+		touchscreen-inverted-y;
+		/* hw ts resolution does not match display */
+		touchscreen-size-y = <1024>;
+		touchscreen-size-x = <768>;
+		touchscreen-swapped-x-y;
+	};
 };
 
 &i2c3 {