linux-kernel - Re: [PATCH v2 2/3] ASoC: dt-bindings: Add sample format conversion

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Date:   Tue, 2 Aug 2022 08:50:08 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sameer Pujar <spujar@...dia.com>
Cc:     broonie@...nel.org, lgirdwood@...il.com,
        krzysztof.kozlowski+dt@...aro.org, perex@...ex.cz, tiwai@...e.com,
        kuninori.morimoto.gx@...esas.com, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] ASoC: dt-bindings: Add sample format conversion

On Mon, Aug 01, 2022 at 09:37:31PM +0530, Sameer Pujar wrote:
> Presently "convert-channels" and "convert-rate" DT bindings are available
> for channel and rate fixups respectively.
> 
> Similarly add "convert-sample-format" binding to fixup DAI sample format
> as well. This is added to simple-card and audio-graph based sound cards.

Do you have users for both cases?

> 
> Signed-off-by: Sameer Pujar <spujar@...dia.com>
> Cc: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> ---
>  Documentation/devicetree/bindings/sound/audio-graph-port.yaml |  4 ++++
>  Documentation/devicetree/bindings/sound/audio-graph.yaml      |  2 ++
>  Documentation/devicetree/bindings/sound/dai-params.yaml       | 10 ++++++++++
>  Documentation/devicetree/bindings/sound/simple-card.yaml      |  4 ++++
>  4 files changed, 20 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml
> index 30a644d9..8e64192 100644
> --- a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml
> +++ b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml
> @@ -22,6 +22,8 @@ properties:
>      $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-rate"
>    convert-channels:
>      $ref: "/schemas/sound/dai-params.yaml#/properties/dai-channels"
> +  convert-sample-format:
> +    $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-format"
>  
>  patternProperties:
>    "^endpoint(@[0-9a-f]+)?":
> @@ -67,6 +69,8 @@ patternProperties:
>          $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-rate"
>        convert-channels:
>          $ref: "/schemas/sound/dai-params.yaml#/properties/dai-channels"
> +      convert-sample-format:
> +        $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-format"
>  
>        dai-tdm-slot-width-map:
>          description: Mapping of sample widths to slot widths. For hardware
> diff --git a/Documentation/devicetree/bindings/sound/audio-graph.yaml b/Documentation/devicetree/bindings/sound/audio-graph.yaml
> index a9cd52e..93ddd55 100644
> --- a/Documentation/devicetree/bindings/sound/audio-graph.yaml
> +++ b/Documentation/devicetree/bindings/sound/audio-graph.yaml
> @@ -30,6 +30,8 @@ properties:
>      $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-rate"
>    convert-channels:
>      $ref: "/schemas/sound/dai-params.yaml#/properties/dai-channels"
> +  convert-sample-format:
> +    $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-format"

Can someone explain why we need these properties defined in 3 different 
locations? That's not a great pattern to continue.

>  
>    pa-gpios:
>      maxItems: 1
> diff --git a/Documentation/devicetree/bindings/sound/dai-params.yaml b/Documentation/devicetree/bindings/sound/dai-params.yaml
> index aae60cb..933957d 100644
> --- a/Documentation/devicetree/bindings/sound/dai-params.yaml
> +++ b/Documentation/devicetree/bindings/sound/dai-params.yaml
> @@ -19,6 +19,16 @@ properties:
>      minimum: 1
>      maximum: 32
>  
> +  dai-sample-format:
> +    description: Audio sample format used by DAI
> +    $ref: /schemas/types.yaml#/definitions/string
> +    enum:
> +      - s8
> +      - s16_le
> +      - s24_le
> +      - s24_3le
> +      - s32_le
> +
>    dai-sample-rate:
>      description: Audio sample rate used by DAI
>      $ref: /schemas/types.yaml#/definitions/uint32
> diff --git a/Documentation/devicetree/bindings/sound/simple-card.yaml b/Documentation/devicetree/bindings/sound/simple-card.yaml
> index ab03a2b..ec21190 100644
> --- a/Documentation/devicetree/bindings/sound/simple-card.yaml
> +++ b/Documentation/devicetree/bindings/sound/simple-card.yaml
> @@ -183,6 +183,8 @@ properties:
>      $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-rate"
>    simple-audio-card,convert-channels:
>      $ref: "/schemas/sound/dai-params.yaml#/properties/dai-channels"
> +  simple-audio-card,convert-sample-format:

Don't add more properties with 'simple-audio-card,' prefix. That's not a 
pattern we want to be consistent with...

> +    $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-format"
>    simple-audio-card,prefix:
>      $ref: "#/definitions/prefix"
>    simple-audio-card,pin-switches:
> @@ -226,6 +228,8 @@ patternProperties:
>          $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-rate"
>        convert-channels:
>          $ref: "/schemas/sound/dai-params.yaml#/properties/dai-channels"
> +      convert-sample-format:
> +        $ref: "/schemas/sound/dai-params.yaml#/properties/dai-sample-format"
>        prefix:
>          $ref: "#/definitions/prefix"
>        pin-switches:
> -- 
> 2.7.4
> 
>