On 23/10/16 23:39, Peter Rosin wrote:
> Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
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 = <®_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-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>
>
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