ARM: dts: stm32: add touchscreen on stm32f746-disco board

The patch adds support for touchscreen on the stm32f746-disco board.
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/st/stm32f746-disco.dts

@@ -43,8 +43,9 @@
 /dts-v1/;
 #include "stm32f746.dtsi"
 #include "stm32f746-pinctrl.dtsi"
-#include <dt-bindings/input/input.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/interrupt-controller/irq.h>
 
 / {
 	model = "STMicroelectronics STM32F746-DISCO board";
@@ -99,6 +100,22 @@ &i2c1 {
 	status = "okay";
 };
 
+&i2c3 {
+	pinctrl-0 = <&i2c3_pins_a>;
+	pinctrl-names = "default";
+	clock-frequency = <400000>;
+	status = "okay";
+
+	touchscreen@38 {
+		compatible = "edt,edt-ft5306";
+		reg = <0x38>;
+		interrupt-parent = <&gpioi>;
+		interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
+		touchscreen-size-x = <480>;
+		touchscreen-size-y = <272>;
+	};
+};
+
 &sdio1 {
 	status = "okay";
 	vmmc-supply = <&mmc_vcard>;