linux-kernel - Re: [PATCH v3 5/6] ASoC: dt-bindings: mediatek,mt7986-wm8960: add mt7986-wm8960 document

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Date:   Mon, 31 Jul 2023 10:14:22 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Maso Huang (黃加竹) 
        <Maso.Huang@...iatek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "chenxiangrui@...qin.corp-partner.google.com" 
        <chenxiangrui@...qin.corp-partner.google.com>,
        Trevor Wu (吳文良) <Trevor.Wu@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "broonie@...nel.org" <broonie@...nel.org>,
        Allen-KH Cheng (程冠勲) 
        <Allen-KH.Cheng@...iatek.com>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "perex@...ex.cz" <perex@...ex.cz>, "arnd@...db.de" <arnd@...db.de>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: Re: [PATCH v3 5/6] ASoC: dt-bindings: mediatek,mt7986-wm8960: add
 mt7986-wm8960 document

On 31/07/2023 09:31, Maso Huang (黃加竹) wrote:
> On Fri, 2023-07-28 at 14:49 +0200, Krzysztof Kozlowski wrote:
>>  	 
>> External email : Please do not click links or open attachments until
>> you have verified the sender or the content.
>>  On 28/07/2023 11:08, Maso Huang wrote:
>>> Add document for mt7986 board with wm8960.
>>>
>>> Signed-off-by: Maso Huang <maso.huang@...iatek.com>
>>> ---
>>>  .../sound/mediatek,mt7986-wm8960.yaml         | 53
>> +++++++++++++++++++
>>>  1 file changed, 53 insertions(+)
>>>  create mode 100644
>> Documentation/devicetree/bindings/sound/mediatek,mt7986-wm8960.yaml
>>>
>>> diff --git
>> a/Documentation/devicetree/bindings/sound/mediatek,mt7986-wm8960.yaml 
>> b/Documentation/devicetree/bindings/sound/mediatek,mt7986-wm8960.yaml
>>> new file mode 100644
>>> index 000000000000..76394f7e5502
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/sound/mediatek,mt7986-
>> wm8960.yaml
>>> @@ -0,0 +1,53 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: 
>> http://devicetree.org/schemas/sound/mediatek,mt7986-wm8960.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: MediaTek MT7986 sound card with WM8960 codec
>>> +
>>> +maintainers:
>>> +  - Maso Huang <maso.huang@...iatek.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: mediatek,mt7986-wm8960-machine
>>> +
>>> +  mediatek,platform:
>>> +    $ref: /schemas/types.yaml#/definitions/phandle
>>> +    description: The phandle of MT7986 platform.
>>> +
>>> +  audio-routing:
>>> +    $ref: /schemas/types.yaml#/definitions/non-unique-string-array
>>> +    description:
>>> +      A list of the connections between audio components. Each
>> entry is a
>>> +      sink/source pair of strings. Valid names could be the input
>> or output
>>> +      widgets of audio components, power supplies, MicBias of
>> codec and the
>>> +      software switch.
>>> +
>>> +  mediatek,audio-codec:
>>> +    $ref: /schemas/types.yaml#/definitions/phandle
>>> +    description: The phandle of wm8960 codec.
>>> +
>>
>> How did you implement Rob's comment? Or did you just ignore it?
>>
>> Best regards,
>> Krzysztof
>>
> 
> Hi Krzysztof,
> 
> Sorry, I did not mean to ignore Rob's comment.
> I waited for some suggestion in mail below, but it seems Rob was a
> little busy.
> 
> https://lore.kernel.org/lkml/8c6316e79e40406e4d46709f602dcb14a4c00562.camel@mediatek.com/
> 
> After gentle ping last week and receiving your advice, I thought that
> means to send the v3 patch and might discuss dtbingding in v3 series.
> 
> So sorry for misunderstanding it, I'll check the details with Rob in v3
> series then refine it in v4.

The problem is that you did not reference in this patch any ongoing
discussion and further questions, so comment looks like addressed, while
it was not.

Rob said:
"in a common schema and reference them "
You said:
"common part yaml and reference to it"
so I think you both agreed on the same.

The advice would be to create common binding which is then referenced by
other and your bindings. However if you start doing it, you will notice
that it is impossible, because you have conflicting types for
"audio-codec", so you cannot have one definition.

This leads to the point - property is probably wrong and you need
dai-link with sound-dai property, just like most cards are doing.

Best regards,
Krzysztof