arch/arm/boot/dts/overlays/goodix-overlay.dts


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// Device tree overlay for I2C connected Goodix gt9271 multiple touch controller
/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2835";

	fragment@0 {
		target = <&gpio>;
		__overlay__ {
			goodix_pins: goodix_pins {
				brcm,pins = <4 17>; // interrupt and reset
				brcm,function = <0 0>; // in
				brcm,pull = <2 2>; // pull-up
			};
		};
	};

	fragment@1 {
		target = <&i2c1>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			gt9271: gt9271@14 {
				compatible = "goodix,gt9271";
				reg = <0x14>;
				pinctrl-names = "default";
				pinctrl-0 = <&goodix_pins>;
				interrupt-parent = <&gpio>;
				interrupts = <4 2>; // high-to-low edge triggered
				irq-gpios = <&gpio 4 0>; // Pin7 on GPIO header
				reset-gpios = <&gpio 17 0>; // Pin11 on GPIO header
			};
		};
	};

	__overrides__ {
		interrupt = <&goodix_pins>,"brcm,pins:0",
			<&gt9271>,"interrupts:0",
			<&gt9271>,"irq-gpios:4";
		reset = <&goodix_pins>,"brcm,pins:4",
			<&gt9271>,"reset-gpios:4";
	};
};