mcp23017-overlay.dts

// Definitions for MCP23017 Gpio Extender from Microchip Semiconductor

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2835";

	fragment@0 {
		target = <&i2c1>;
		__overlay__ {
			status = "okay";
		};
	};

	fragment@1 {
		target = <&gpio>;
		__overlay__ {
			mcp23017_pins: mcp23017_pins@20 {
				brcm,pins = <4>;
				brcm,function = <0>;
			};
		};
	};

	fragment@2 {
		target = <&i2c1>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;

			mcp23017: mcp@20 {
				compatible = "microchip,mcp23017";
				reg = <0x20>;
				gpio-controller;
				#gpio-cells = <2>;

				status = "okay";
			};
		};
	};

	fragment@3 {
		target = <&mcp23017>;
		__dormant__ {
			compatible = "microchip,mcp23008";
		};
	};

	fragment@4 {
		target = <&mcp23017>;
		mcp23017_irq: __overlay__ {
			#interrupt-cells=<2>;
			interrupt-parent = <&gpio>;
			interrupts = <4 2>;
			interrupt-controller;
			microchip,irq-mirror;
		};
	};

	__overrides__ {
		gpiopin = <&mcp23017_pins>,"brcm,pins:0",
				<&mcp23017_irq>,"interrupts:0";
		addr = <&mcp23017>,"reg:0", <&mcp23017_pins>,"reg:0";
		mcp23008 = <0>,"=3";
		noints = <0>,"!1!4";
	};
};