Re: [PATCH v5 02/13] ASoC: dt-bindings: simple-card: Add additional-devs subnode

[Jonathan Cameron <jic23@kernel.org>]

On Thu, 15 Jun 2023 17:26:20 +0200
Herve Codina <herve.codina@bootlin.com> wrote:

> The additional-devs subnode allows to declared some virtual devices
> as sound card children.
> These virtual devices can then be used by the sound card and so be
> present in the audio path.
> 
> The first virtual device supported is the audio IIO auxiliary device
> in order to support an IIO device as an audio auxiliary device.
> 
> Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Looks fine to me, but given it's not an area I know that much about
(other than the iio consumer bits) take that with a pinch of salt.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  .../bindings/sound/simple-card.yaml           | 53 +++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/simple-card.yaml b/Documentation/devicetree/bindings/sound/simple-card.yaml
> index b05e05c81cc4..59ac2d1d1ccf 100644
> --- a/Documentation/devicetree/bindings/sound/simple-card.yaml
> +++ b/Documentation/devicetree/bindings/sound/simple-card.yaml
> @@ -148,6 +148,15 @@ definitions:
>      required:
>        - sound-dai
>  
> +  additional-devs:
> +    type: object
> +    description:
> +      Additional devices used by the simple audio card.
> +    patternProperties:
> +      '^iio-aux(-.+)?$':
> +        type: object
> +        $ref: audio-iio-aux.yaml#
> +
>  properties:
>    compatible:
>      contains:
> @@ -187,6 +196,8 @@ properties:
>      $ref: "#/definitions/mclk-fs"
>    simple-audio-card,aux-devs:
>      $ref: "#/definitions/aux-devs"
> +  simple-audio-card,additional-devs:
> +    $ref: "#/definitions/additional-devs"
>    simple-audio-card,convert-rate:
>      $ref: "#/definitions/convert-rate"
>    simple-audio-card,convert-channels:
> @@ -359,6 +370,48 @@ examples:
>          };
>      };
>  
> +# --------------------
> +# route audio to/from a codec through an amplifier
> +# designed with a potentiometer driven by IIO:
> +# --------------------
> +  - |
> +    sound {
> +        compatible = "simple-audio-card";
> +
> +        simple-audio-card,aux-devs = <&amp_in>, <&amp_out>;
> +        simple-audio-card,routing =
> +            "CODEC LEFTIN", "AMP_IN LEFT OUT",
> +            "CODEC RIGHTIN", "AMP_IN RIGHT OUT",
> +            "AMP_OUT LEFT IN", "CODEC LEFTOUT",
> +            "AMP_OUT RIGHT IN", "CODEC RIGHTOUT";
> +
> +        simple-audio-card,additional-devs {
> +            amp_out: iio-aux-out {
> +                compatible = "audio-iio-aux";
> +                io-channels = <&pot_out 0>, <&pot_out 1>;
> +                io-channel-names = "LEFT", "RIGHT";
> +                snd-control-invert-range = <1 1>;
> +                sound-name-prefix = "AMP_OUT";
> +            };
> +
> +            amp_in: iio_aux-in {
> +                compatible = "audio-iio-aux";
> +                io-channels = <&pot_in 0>, <&pot_in 1>;
> +                io-channel-names = "LEFT", "RIGHT";
> +                sound-name-prefix = "AMP_IN";
> +            };
> +        };
> +
> +        simple-audio-card,cpu {
> +            sound-dai = <&cpu>;
> +        };
> +
> +        simple-audio-card,codec {
> +            sound-dai = <&codec>;
> +            clocks = <&clocks>;
> +        };
> +    };
> +
>  # --------------------
>  # Sampling Rate Conversion
>  # --------------------