Commit 640f592e authored by Phil Elwell's avatar Phil Elwell
Browse files

overlays: Add mcp342x overlay 

Support the MCP342x family of ADCs from Microchip.

See: https://github.com/raspberrypi/linux/issues/2819



Signed-off-by: default avatarPhil Elwell <phil@raspberrypi.org>
parent a9e96b88

arch/arm/boot/dts/overlays/Makefile

+1 −0
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@@ -79,6 +79,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ 
	mcp2515-can1.dtbo \

	mcp3008.dtbo \

	mcp3202.dtbo \

	mcp342x.dtbo \

	media-center.dtbo \

	midi-uart0.dtbo \

	midi-uart1.dtbo \

arch/arm/boot/dts/overlays/README

+16 −0
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@@ -1267,6 +1267,22 @@ Params: spi<n>-<m>-present boolean, configure device at spi<n>, cs<m> 
        spi<n>-<m>-speed        integer, set the spi bus speed for this device





Name:   mcp342x

Info:   Overlay for activation of Microchip MCP3421-3428 ADCs over I2C

Load:   dtoverlay=mcp342x,<param>=<val>

Params: addr                    I2C bus address of device, for devices with

                                addresses that are configurable, e.g. by

                                hardware links (default=0x68)

        mcp3421                 The device is an MCP3421

        mcp3422                 The device is an MCP3422

        mcp3423                 The device is an MCP3423

        mcp3424                 The device is an MCP3424

        mcp3425                 The device is an MCP3425

        mcp3426                 The device is an MCP3426

        mcp3427                 The device is an MCP3427

        mcp3428                 The device is an MCP3428





Name:   media-center

Info:   Media Center HAT - 2.83" Touch Display + extras by Pi Supply

Load:   dtoverlay=media-center,<param>=<val>

arch/arm/boot/dts/overlays/mcp342x-overlay.dts

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// Overlay for MCP3421-8 ADCs from Microchip Semiconductor



/dts-v1/;

/plugin/;



/ {

	compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";



	fragment@0 {

		target = <&i2c1>;

		__overlay__ {

			#address-cells = <1>;

			#size-cells = <0>;



			status = "okay";



			mcp342x: mcp@68 {

				reg = <0x68>;



				status = "okay";

			};

		};

	};



	fragment@1 {

		target = <&mcp342x>;

		__dormant__ {

			compatible = "microchip,mcp3421";

		};

	};



	fragment@2 {

		target = <&mcp342x>;

		__dormant__ {

			compatible = "microchip,mcp3422";

		};

	};



	fragment@3 {

		target = <&mcp342x>;

		__dormant__ {

			compatible = "microchip,mcp3423";

		};

	};



	fragment@4 {

		target = <&mcp342x>;

		__dormant__ {

			compatible = "microchip,mcp3424";

		};

	};



	fragment@5 {

		target = <&mcp342x>;

		__dormant__ {

			compatible = "microchip,mcp3425";

		};

	};



	fragment@6 {

		target = <&mcp342x>;

		__dormant__ {

			compatible = "microchip,mcp3426";

		};

	};



	fragment@7 {

		target = <&mcp342x>;

		__dormant__ {

			compatible = "microchip,mcp3427";

		};

	};



	fragment@8 {

		target = <&mcp342x>;

		__dormant__ {

			compatible = "microchip,mcp3428";

		};

	};



	__overrides__ {

		addr = <&mcp342x>,"reg:0";

		mcp3421 = <0>,"=1";

		mcp3422 = <0>,"=2";

		mcp3423 = <0>,"=3";

		mcp3424 = <0>,"=4";

		mcp3425 = <0>,"=5";

		mcp3426 = <0>,"=6";

		mcp3427 = <0>,"=7";

		mcp3428 = <0>,"=8";

	};

};