arm64: dts: mediatek: mt6795-xperia-m5: Add Synaptics RMI4 Touchscreen

Add the RMI4 Touchscreen on I2C2 and its pin definitions.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230327083647.22017-14-angelogioacchino.delregno@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Author: AngeloGioacchino Del Regno

arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts

@@ -71,6 +71,28 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c2_pins>;
 	status = "okay";
+
+	touchscreen@20 {
+		compatible = "syna,rmi4-i2c";
+		reg = <0x20>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts-extended = <&pio 6 IRQ_TYPE_EDGE_FALLING>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&ts_pins>;
+		syna,startup-delay-ms = <160>;
+		syna,reset-delay-ms = <90>;
+
+		rmi4-f01@1 {
+			reg = <0x1>;
+			syna,nosleep-mode = <1>;
+		};
+
+		rmi4-f12@12 {
+			reg = <0x12>;
+			syna,sensor-type = <1>;
+		};
+	};
 };
 
 &i2c3 {
@@ -80,6 +102,19 @@
 };
 
 &pio {
+	ts_pins: touchscreen-pins {
+		pins-irq {
+			pinmux = <PINMUX_GPIO6__FUNC_GPIO6>;
+			bias-pull-up;
+			input-enable;
+		};
+
+		pins-rst {
+			pinmux = <PINMUX_GPIO102__FUNC_GPIO102>;
+			output-high;
+		};
+	};
+
 	i2c0_pins: i2c0-pins {
 		pins-bus {
 			pinmux = <PINMUX_GPIO45__FUNC_SDA0>,