linux-kernel - Re: [PATCH 1/3] ASoC: simple-card-utils: Fix device module clock

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Date:   Fri, 12 Mar 2021 11:35:44 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Michael Walle <michael@...le.cc>
Cc:     Sameer Pujar <spujar@...dia.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, jonathanh@...dia.com,
        kuninori.morimoto.gx@...esas.com, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, robh@...nel.org, sharadg@...dia.com,
        thierry.reding@...il.com
Subject: Re: [PATCH 1/3] ASoC: simple-card-utils: Fix device module clock

On Thu, Mar 11, 2021 at 11:11:15PM +0100, Michael Walle wrote:
> Am 2021-03-11 17:15, schrieb Mark Brown:

> > The trick is figuring out if it's best to vary the input clock
> > or to use the FLL to adapt a fixed input clock,

> For simple-audio-card you can set the "clock" property if you want
> that clock to be changed/enabled/disabled. But that doesn't seem to
> be the way to go, at least it was NAKed by Rob for the audio-graph-card.
> I don't see a way to figure out if MCLK should be controlled by
> simple-*-card without adding further properties to the device tree.

If the card has a clock API clock as sysclk then set_sysclk(() should
be configuring that clock.

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