On 23/10/16 23:39, Peter Rosin wrote:
> Signed-off-by: Peter Rosin <p...@axentia.se>
I'm happy with this, but it's odd enough I'd like some devicetree maintainer
feedback ideally.

Thanks,

Jonathan
> ---
>  .../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..fdf47a01bfef
> --- /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 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";
> +     };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7c65585e1230..6218010128dc 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -6111,6 +6111,12 @@ L:     linux-me...@vger.kernel.org
>  S:   Maintained
>  F:   drivers/media/rc/iguanair.c
>  
> +IIO DIGITAL POTENTIOMETER DAC
> +M:   Peter Rosin <p...@axentia.se>
> +L:   linux-...@vger.kernel.org
> +S:   Maintained
> +F:   Documentation/devicetree/bindings/iio/dac/dpot-dac.txt
> +
>  IIO SUBSYSTEM AND DRIVERS
>  M:   Jonathan Cameron <ji...@kernel.org>
>  R:   Hartmut Knaack <knaac...@gmx.de>
> 

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