linux-kernel - Re: [PATCH 2/2] ASoC: dt-bindings: imx-akcodec: Add binding doc for akcodec machine driver

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Date:   Mon, 3 May 2021 12:00:30 -0500
From:   Rob Herring <robh@...nel.org>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, timur@...nel.org, nicoleotsuka@...il.com,
        Xiubo.Lee@...il.com, festevam@...il.com, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, linux-imx@....com,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] ASoC: dt-bindings: imx-akcodec: Add binding doc for
 akcodec machine driver

On Fri, Apr 23, 2021 at 01:51:47PM +0800, Shengjiu Wang wrote:
> Imx-akcodec is a new added machine driver for supporting
> ak4458/ak5558/ak5552/ak4497 codec on i.MX platforms.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
>  .../bindings/sound/imx-audio-akcodec.yaml     | 60 +++++++++++++++++++
>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/imx-audio-akcodec.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/imx-audio-akcodec.yaml b/Documentation/devicetree/bindings/sound/imx-audio-akcodec.yaml
> new file mode 100644
> index 000000000000..7419bf7224e9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/imx-audio-akcodec.yaml
> @@ -0,0 +1,60 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/imx-audio-akcodec.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP i.MX audio complex with AK4458/AK5558/AK5552/AK4497 codec

Looks like the existing fsl-asoc-card.txt? You should convert to schema 
and use that. Otherwise, my comments are based on this all being 'new'.

> +
> +maintainers:
> +  - Shengjiu Wang <shengjiu.wang@....com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - fsl,imx8mq-audio-ak4458
> +      - fsl,imx8mq-audio-ak4497
> +      - fsl,imx8mq-audio-ak5558
> +      - fsl,imx-audio-ak4497
> +      - fsl,imx-audio-ak4458
> +      - fsl,imx-audio-ak5558
> +      - fsl,imx-audio-ak5552

I continue to not understand why audio bindings need the codec(s) in the 
compatible strings. Can't you look up the codec thru the audio-codec 
property?

> +
> +  model:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    description: User specified audio sound card name
> +
> +  audio-cpu:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: The phandle of a CPU DAI controller
> +
> +  audio-codec:
> +    description: The phandle of Codec DAI controllers, there are two
> +                 controllers maximum.

We have the common 'sound-dai' property. See the simple-card.yaml 
binding. 

> +
> +  audio-asrc:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: The phandle of ASRC. It can be absent if there's no
> +                 need to add ASRC support via DPCM.

Needs a vendor prefix.

> +
> +  fsl,tdm:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      This is a boolean property. If present, the TDM mode is enabled.

But this one seems like something that could or should be common.

> +
> +required:
> +  - compatible
> +  - model
> +  - audio-cpu
> +  - audio-codec
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    sound-ak4458 {
> +        compatible = "fsl,imx-audio-ak4458";
> +        model = "ak4458-audio";
> +        audio-cpu = <&sai1>;
> +        audio-codec = <&ak4458_1>, <&ak4458_2>;
> +    };
> -- 
> 2.17.1
>