dt-bindings: iio: document dpot-dac bindings (ed13134b) · Commits · github.com / kvm-riscv / linux

Documentation/devicetree/bindings/iio/dac/dpot-dac.txt

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		Bindings for DAC emulation using a digital potentiometer

		It is assumed that the dpot is used as a voltage divider between the
		current dpot wiper setting and the maximum resistance of the dpot. The
		divided voltage is provided by a vref regulator.

		.------.
		.-----------. \| \|
		\| vref \|--' .---.
		\| regulator \|--. \| \|
		'-----------' \| \| d \|
		\| \| p \|
		\| \| o \| wiper
		\| \| t \|<---------+
		\| \| \|
		\| '---' dac output voltage
		\| \|
		'------+------------+

		Required properties:
		- compatible: Should be "dpot-dac"
		- vref-supply: The regulator supplying the voltage divider.
		- io-channels: Channel node of the dpot to be used for the voltage division.
		- io-channel-names: Should be "dpot".

		Example:

		&i2c {
		dpot: mcp4651-503@28 {
		compatible = "microchip,mcp4651-503";
		reg = <0x28>;
		#io-channel-cells = <1>;
		};
		};

		dac {
		compatible = "dpot-dac";
		vref-supply = <&reg_3v3>;
		io-channels = <&dpot 0>;
		io-channel-names = "dpot";
		};

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		@@ -6119,6 +6119,12 @@ L: linux-media@vger.kernel.org
		S: Maintained
		F: drivers/media/rc/iguanair.c

		IIO DIGITAL POTENTIOMETER DAC
		M: Peter Rosin <peda@axentia.se>
		L: linux-iio@vger.kernel.org
		S: Maintained
		F: Documentation/devicetree/bindings/iio/dac/dpot-dac.txt

		IIO SUBSYSTEM AND DRIVERS
		M: Jonathan Cameron <jic23@kernel.org>
		R: Hartmut Knaack <knaack.h@gmx.de>