Custom Device Tree Overlay for MCP23017 via i2c-ao

Software
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2

Here is another example that I have found which is similar:

/dts-v1/;
/plugin/;

/ {
	compatible = "libretech,cc", "amlogic,s905x", "amlogic,meson-gxl";

	fragment@0 {
		target = <&i2c0>;
		__overlay__ {
			status = "okay";
		};
	};

	fragment@1 {
		target = <&gpio>;
		__overlay__ {
			mcp23017_pins: mcp23017_pins {
				brcm,pins = <4>;
				brcm,function = <0>;
			};
		};
	};

	fragment@2 {
		target = <&i2c0>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;

			mcp23017: mcp@20 {
				compatible = "microchip,mcp23017";
				reg = <0x20>;
				gpio-controller;
				#gpio-cells = <2>;
				#interrupt-cells=<2>;
				interrupt-parent = <&gpio>;
				interrupts = <4 2>;
				interrupt-controller;
				microchip,irq-mirror;
			};
		};
	};
	
	__overrides__ {
		gpiopin = <&mcp23017_pins>,"brcm,pins:0",
				<&mcp23017>,"interrupts:0";
		addr = <&mcp23017>,"reg:0";
	};
};