arm64: dts: qcom: msm8916-samsung-serranove: Add touch screen

Like msm8916-samsung-a3u-eur, the S4 Mini VE uses a Zinitix BT541
touch screen. Add it together with the necessary fixed-regulator
to the device tree.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211004201921.18526-3-stephan@gerhold.net

arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts

@@ -78,6 +78,19 @@ hall-sensor {
 		};
 	};
 
+	reg_vdd_tsp: regulator-vdd-tsp {
+		compatible = "regulator-fixed";
+		regulator-name = "vdd_tsp";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+
+		gpio = <&msmgpio 73 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&tsp_en_default>;
+	};
+
 	i2c-muic {
 		compatible = "i2c-gpio";
 		sda-gpios = <&msmgpio 105 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
@@ -102,6 +115,27 @@ muic: extcon@14 {
 	};
 };
 
+&blsp_i2c5 {
+	status = "okay";
+
+	touchscreen@20 {
+		compatible = "zinitix,bt541";
+		reg = <0x20>;
+
+		interrupt-parent = <&msmgpio>;
+		interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
+
+		touchscreen-size-x = <540>;
+		touchscreen-size-y = <960>;
+
+		vdd-supply = <&reg_vdd_tsp>;
+		vddo-supply = <&pm8916_l6>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&tsp_irq_default>;
+	};
+};
+
 &blsp1_uart2 {
 	status = "okay";
 };
@@ -298,4 +332,20 @@ muic_irq_default: muic-irq-default {
 		drive-strength = <2>;
 		bias-disable;
 	};
+
+	tsp_en_default: tsp-en-default {
+		pins = "gpio73";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+	};
+
+	tsp_irq_default: tsp-irq-default {
+		pins = "gpio13";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+	};
 };