ARM: dts: stm32: enable stmpe811 on stm32429-disco board

Enable the stmpe811 touch screen on stm32429-disco board.
Signed-off-by: dillon min <dillon.minfei@gmail.com>
Reviewed-by: Philippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32f429-disco.dts

@@ -110,6 +110,51 @@ &crc {
 	status = "okay";
 };
 
+&i2c3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c3_pins>;
+	clock-frequency = <100000>;
+	status = "okay";
+
+	stmpe811@41 {
+		compatible = "st,stmpe811";
+		reg = <0x41>;
+		interrupts = <15 IRQ_TYPE_EDGE_FALLING>;
+		interrupt-parent = <&gpioa>;
+		/* 3.25 MHz ADC clock speed */
+		st,adc-freq = <1>;
+		/* 12-bit ADC */
+		st,mod-12b = <1>;
+		/* internal ADC reference */
+		st,ref-sel = <0>;
+		/* ADC converstion time: 80 clocks */
+		st,sample-time = <4>;
+
+		stmpe_touchscreen {
+			compatible = "st,stmpe-ts";
+			/* 8 sample average control */
+			st,ave-ctrl = <3>;
+			/* 7 length fractional part in z */
+			st,fraction-z = <7>;
+			/*
+			 * 50 mA typical 80 mA max touchscreen drivers
+			 * current limit value
+			 */
+			st,i-drive = <1>;
+			/* 1 ms panel driver settling time */
+			st,settling = <3>;
+			/* 5 ms touch detect interrupt delay */
+			st,touch-det-delay = <5>;
+		};
+
+		stmpe_adc {
+			compatible = "st,stmpe-adc";
+			/* forbid to use ADC channels 3-0 (touch) */
+			st,norequest-mask = <0x0F>;
+		};
+	};
+};
+
 &ltdc {
 	status = "okay";
 	pinctrl-0 = <&ltdc_pins_b>;