arm64: dts: qcom: msm8916-huawei-g7: Add touchscreen

The Huawei Ascend G7 has a Synaptics "C199HW-006" touchscreen,
supplied by pm8916_l17 and pm8916_l16. Add it to the device tree
and reduce the maximum allowed voltage for pm8916_l16 to 1.8V since
we really should not use more for an I/O supply.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20210514104328.18756-2-stephan@gerhold.netSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/msm8916-huawei-g7.dts

@@ -6,6 +6,7 @@
 #include "msm8916-pm8916.dtsi"
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/leds/common.h>
 
 /*
@@ -84,6 +85,38 @@ usb_id: usb-id {
 	};
 };
 
+&blsp_i2c5 {
+	status = "okay";
+
+	rmi4@70 {
+		compatible = "syna,rmi4-i2c";
+		reg = <0x70>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		interrupt-parent = <&msmgpio>;
+		interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
+
+		vdd-supply = <&pm8916_l17>;
+		vio-supply = <&pm8916_l16>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&ts_irq_default>;
+
+		syna,startup-delay-ms = <100>;
+
+		rmi4-f01@1 {
+			reg = <0x1>;
+			syna,nosleep-mode = <1>; /* Allow sleeping */
+		};
+
+		rmi4-f11@11 {
+			reg = <0x11>;
+			syna,sensor-type = <1>; /* Touchscreen */
+		};
+	};
+};
+
 &blsp1_uart2 {
 	status = "okay";
 };
@@ -230,7 +263,7 @@ l15 {
 
 	l16 {
 		regulator-min-microvolt = <1800000>;
-		regulator-max-microvolt = <3300000>;
+		regulator-max-microvolt = <1800000>;
 	};
 
 	l17 {
@@ -269,6 +302,14 @@ sdhc2_cd_default: sdhc2-cd-default {
 		bias-disable;
 	};
 
+	ts_irq_default: ts-irq-default {
+		pins = "gpio13";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+	};
+
 	usb_id_default: usb-id-default {
 		pins = "gpio117";
 		function = "gpio";