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dt-bindings: iio: document dpot-dac bindings

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Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Peter Rosin 2016-11-08 12:58:55 +01:00 committed by Jonathan Cameron
parent ff6bd170c0
commit ed13134ba8
2 changed files with 47 additions and 0 deletions
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41
Documentation/devicetree/bindings/iio/dac/dpot-dac.txt Normal file
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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";
};

6
MAINTAINERS
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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>