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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <734fbf254c64668856e987aafe9d7dfd3ec86941.camel@mediatek.com>
Date:   Wed, 30 Mar 2022 23:48:01 +0800
From:   Jiaxin Yu <jiaxin.yu@...iatek.com>
To:     Mark Brown <broonie@...nel.org>
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, 2022-03-30 at 15:24 +0100, Mark Brown wrote:
> 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.

"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."

Sorry, I don't understand the real idea of this description. Does it
mean that dt-bindings in this series don't need to be updated, but the
driver?