linux-kernel - Re: [PATCH v6 02/13] ASoC: dt-bindings: simple-card: Add additional-devs subnode

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Date:   Tue, 27 Jun 2023 09:53:18 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Herve Codina <herve.codina@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
CC:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        Wojciech Ziemba <wojciech.ziemba@...el.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v6 02/13] ASoC: dt-bindings: simple-card: Add
 additional-devs subnode



Le 23/06/2023 à 10:58, Herve Codina a écrit :
> 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@...tlin.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Reviewed-by: Christophe Leroy <christophe.leroy@©sgroup.eu>

> ---
>   .../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
>   # --------------------