linux-kernel - Re: [v7 2/4] ASoC: mediatek: mt8192: refactor for I2S3 DAI link of speaker

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Date:   Wed, 30 Mar 2022 15:24:11 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jiaxin Yu <jiaxin.yu@...iatek.com>
Cc:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>, robh+dt@...nel.org, tzungbi@...gle.com,
        angelogioacchino.delregno@...labora.com, aaronyu@...gle.com,
        matthias.bgg@...il.com, trevor.wu@...iatek.com, linmq006@...il.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Tzung-Bi Shih <tzungbi@...nel.org>
Subject: Re: [v7 2/4] ASoC: mediatek: mt8192: refactor for I2S3 DAI link of
 speaker

On Wed, Mar 30, 2022 at 10:06:24PM +0800, Jiaxin Yu wrote:
> On Wed, 2022-03-30 at 13:30 +0100, Mark Brown wrote:

> > Making a previously optional property required means that systems
> > that
> > previously worked may stop working unless they update their DT, DTs
> > may
> > be distributed separately to the kernel and perhaps even baked into
> > firmware or similar.

> Thank you for your detailed answer. I should keep the driver's behavior
> consistent with the description of dt-bindings. The "mediatek,hdmi-
> codec" needs to be set as the required property. Is my understanding
> right?

The binding document and code should match so if one is changed the
other needs to be changed too.

In theory we should never change a previously optional property to
required which would mean that the code should be updated to reflect the
binding document, however sometimes the DT isn't actually used as a
stable intereface by anything for a given property or device type so we
can get away with changing things.

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