Signed-off-by: Peter Rosin <peda@xxxxxxxxxx> --- .../devicetree/bindings/iio/dac/dpot-dac.txt | 41 ++++++++++++++++++++++ MAINTAINERS | 6 ++++ 2 files changed, 47 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/dpot-dac.txt diff --git a/Documentation/devicetree/bindings/iio/dac/dpot-dac.txt b/Documentation/devicetree/bindings/iio/dac/dpot-dac.txt new file mode 100644 index 000000000000..4fd5d63cc2d6 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/dpot-dac.txt @@ -0,0 +1,41 @@ +Bindings for DAC emulation using a digital potentiometer + +It is assumed the 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 = <®_3v3>; + io-channels = <&dpot 0>; + io-channel-names = "dpot"; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 1cd38a7e0064..c68b72088945 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6111,6 +6111,12 @@ L: linux-media@xxxxxxxxxxxxxxx S: Maintained F: drivers/media/rc/iguanair.c +IIO DIGITAL POTENTIOMETER DAC +M: Peter Rosin <peda@xxxxxxxxxx> +L: linux-iio@xxxxxxxxxxxxxxx +S: Maintained +F: Documentation/devicetree/bindings/iio/dac/dpot-dac.txt + IIO SUBSYSTEM AND DRIVERS M: Jonathan Cameron <jic23@xxxxxxxxxx> R: Hartmut Knaack <knaack.h@xxxxxx> -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html