arm64: dts: qcom: sm8450-nagara: Add Samsung touchscreen

Add device node and required pinctrl settings (as well as a fixup for
an existing one, whoops!) to support the Samsung Electronics
touchscreen on Nagara devices.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221114095654.34561-4-konrad.dybcio@linaro.org

arch/arm64/boot/dts/qcom/sm8450-sony-xperia-nagara.dtsi

@@ -435,7 +435,22 @@ &gpi_dma2 {
 	status = "okay";
 };
 
-/* I2C4 is used, it hosts a Samsung touchscreen, but GPI DMA is broken.. */
+&i2c4 {
+	clock-frequency = <400000>;
+	status = "okay";
+
+	touchscreen@48 {
+		compatible = "samsung,s6sy761";
+		reg = <0x48>;
+		interrupt-parent = <&tlmm>;
+		interrupts = <21 0x2008>;
+		vdd-supply = <&pm8350c_l2>;
+		avdd-supply = <&pm8350c_l3>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&ts_reset_default &ts_int_default>;
+	};
+};
 
 &i2c5 {
 	clock-frequency = <400000>;
@@ -566,8 +581,16 @@ &spi10 {
 &tlmm {
 	gpio-reserved-ranges = <28 4>;
 
+	ts_reset_default: ts-reset-default-state {
+		pins = "gpio20";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-disable;
+		output-high;
+	};
+
 	ts_int_default: ts-int-default-state {
-		pins = "gpio23";
+		pins = "gpio21";
 		function = "gpio";
 		drive-strength = <2>;
 		bias-disable;