[PATCH] arm64: dts: mt8365-evk: Add goodix touchscreen support

[Louis-Alexis Eyraud]

The Mediatek Genio 350-EVK board has on the DSI0 connector a StarTek
KD070FHFID015 display panel that uses a Goodix GT9271 I2C capacitive
touch controller.

The mt8365-evk devicetree already have the display panel support but
lacks the touchscreen support, so add it.

Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud at collabora.com>
---
Tested on a Mediatek Genio 350-EVK board with a kernel
based on linux-next (tag: next-20250514).
---
 arch/arm64/boot/dts/mediatek/mt8365-evk.dts | 40 +++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8365-evk.dts b/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
index 1f8584bd66c33744c3a2f29ae9bb19c934588ce0..ea75f87acf746d61a982dadf0d96cff9076c06a6 100644
--- a/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
@@ -69,6 +69,21 @@ memory at 40000000 {
 		reg = <0 0x40000000 0 0xc0000000>;
 	};
 
+	reg_vsys: regulator-vsys {
+		compatible = "regulator-fixed";
+		regulator-name = "vsys";
+		regulator-always-on;
+		regulator-boot-on;
+	};
+
+	touch0_fixed_3v3: regulator-5 {
+		compatible = "regulator-fixed";
+		regulator-name = "vio33_tp";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&reg_vsys>;
+	};
+
 	usb_otg_vbus: regulator-0 {
 		compatible = "regulator-fixed";
 		regulator-name = "otg_vbus";
@@ -324,6 +339,18 @@ hdmi_connector_out: endpoint at 0 {
 			};
 		};
 	};
+
+	touchscreen at 5d {
+		compatible = "goodix,gt9271";
+		reg = <0x5d>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&touch_pins>;
+		interrupts-extended = <&pio 78 IRQ_TYPE_EDGE_FALLING>;
+		irq-gpios = <&pio 78 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&pio 79 GPIO_ACTIVE_LOW>;
+		AVDD28-supply = <&touch0_fixed_3v3>;
+		VDDIO-supply = <&mt6357_vrf12_reg>;
+	};
 };
 
 &mmc0 {
@@ -650,6 +677,19 @@ cmd-dat-pins {
 		};
 	};
 
+	touch_pins: touch-pins {
+		ctp-int1-pins {
+			pinmux = <MT8365_PIN_78_CMHSYNC__FUNC_GPIO78>;
+			input-enable;
+			bias-disable;
+		};
+
+		rst-pins {
+			pinmux = <MT8365_PIN_79_CMVSYNC__FUNC_GPIO79>;
+			output-low;
+		};
+	};
+
 	uart0_pins: uart0-pins {
 		pins {
 			pinmux = <MT8365_PIN_35_URXD0__FUNC_URXD0>,

---
base-commit: ccb396cc1664a9a367831fb43de67776547354f4
change-id: 20250513-mt8365-evk-enable-touchscreen-a2652cfdf85e

Best regards,
-- 
Louis-Alexis Eyraud <louisalexis.eyraud at collabora.com>