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

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Message-ID: <CAA+D8ANFmegm2CgOs8u5+FCrR0gGyA_tQHcPCrh3Sikcm_g47Q@mail.gmail.com>
Date:   Sat, 8 May 2021 19:14:33 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, alsa-devel@...a-project.org,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Mark Brown <broonie@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ASoC: dt-bindings: imx-akcodec: Add binding doc for
 akcodec machine driver

Hi

On Tue, May 4, 2021 at 1:01 AM Rob Herring <robh@...nel.org> wrote:
>
> 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'.

Ok, let's treat it as '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?

I will try to remove the codecs type from the compatible string and check
the codec type in driver.

>
> > +
> > +  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.

ok, will use sound-dai.

>
> > +
> > +  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.

ok,  can be removed in the next version.

>
> > +
> > +  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.

Ok, I will use the common one in the next version.

>
> > +
> > +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
> >