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

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Date:   Fri, 28 Jul 2023 14:26:47 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Maso Huang <maso.huang@...iatek.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Trevor Wu <trevor.wu@...iatek.com>,
        Arnd Bergmann <arnd@...db.de>,
        Mars Chen <chenxiangrui@...qin.corp-partner.google.com>,
        Allen-KH Cheng <allen-kh.cheng@...iatek.com>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 6/6] ASoC: dt-bindings: mediatek,mt7986-afe: add audio
 afe document

On Fri, Jul 28, 2023 at 02:51:26PM +0200, Krzysztof Kozlowski wrote:
> On 28/07/2023 11:08, Maso Huang wrote:

> > +  - assigned-clocks
> > +  - assigned-clock-parents

> You should constrain your clocks per variants. I doubt that they are
> really so flexible/optional on each SoC... or maybe missing clocks are
> result of unimplemented parts in the driver? But then this should not
> really affect bindings. Bindings still should require such clocks. Your
> DTS can always provide a <0>, if needed.

Depending on what the clocks are some of them might genuinely be
optional, it's fairly common for audio devices to have multiple clock
inputs and be able to select between them depending on system
requirements or to have bidirectional clock pins which may be either a
provider or consumer depending on system configuration.  No idea how
that applies with this specific device.

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