linux-kernel - Re: [PATCH v2 1/3] dt-bindings: mfd: mediatek: mt6397: Add #sound-dai-cells property

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Message-ID: <a9512a7d-1e8e-414a-9c92-b0a4e1af3617@kernel.org>
Date: Fri, 6 Jun 2025 10:27:24 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Cc: Julien Massot <julien.massot@...labora.com>, kernel@...labora.com,
 Sen Chu <sen.chu@...iatek.com>, Sean Wang <sean.wang@...iatek.com>,
 Macpaul Lin <macpaul.lin@...iatek.com>, Lee Jones <lee@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Hui Liu <hui.liu@...iatek.com>, Yong Wu <yong.wu@...iatek.com>,
 Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, Tinghan Shen
 <tinghan.shen@...iatek.com>, linux-pm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 iommu@...ts.linux.dev
Subject: Re: [PATCH v2 1/3] dt-bindings: mfd: mediatek: mt6397: Add
 #sound-dai-cells property

On 29/05/2025 17:53, Nícolas F. R. A. Prado wrote:
> On Thu, May 22, 2025 at 09:52:07AM +0200, Krzysztof Kozlowski wrote:
>> On Wed, May 14, 2025 at 10:19:56AM GMT, Julien Massot wrote:
>>> The 'mt6359.dtsi' file already uses the '#sound-dai-cells' property.
>>> Add the corresponding property to the binding to fix the following
>>> dtb-check error:
>>>
>>> mediatek/mt8395-radxa-nio-12l.dtb: pmic: '#sound-dai-cells', 'mt6359rtc' do not match any of the regexes: 'pinctrl-[0-9]+'
>>> from schema $id: http://devicetree.org/schemas/mfd/mediatek,mt6397.yaml#
>>
>> If this is a random drive-by, would be fine, but if that's your platform
>> which you should know, then I expect this to be a real reason instead
>> something which can easily be rejected with: what if DTS is wrong?
>>
>> I could not find the ASoC driver for that compatible and quick glance to
>> MFD shown me no usage of dai cells, so you need proper explanation here.
>>
>> Especially, that there is a subnode audio-codec, so adding dai cells to
>> the parent node feels just wrong. One is wrong - either subnode or
>> parent is a codec.
> 
> The driver is sound/soc/codecs/mt6359.c, which defines 2 DAIs. It's currently
> probed by the MFD through the driver name, hence the parent MFD device is the

It does not matter whether MFD or simple bus instantiates a device. Really.

> one used to register the audio component.

I see codecs/mt6359.c registering the component, not the parent MFD
device. This change does not look right but maybe the binding needs
fixes as well.

Best regards,
Krzysztof