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

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Date:   Fri, 12 Mar 2021 13:46:42 +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 Fri, Mar 12, 2021 at 01:30:02PM +0100, Michael Walle wrote:

> The card calls set_sysclk(), which eventually ends up in the codec.
> The codec therefore, could figure out if it needs to configure the
> clock or if it can use its internal FLL.
> Is that what you mean?

Yes.

> But the set_sysclk() of the codec isn't even called, because the
> card itself already tries to call clk_set_rate() on the Codec's MCLK,
> which returns with an error [0].

OK, so I think we need to push this down a level so that the clock
setting is implemented by the core/CODEC rather than by simple-card,
with the helpers being something the CODEC can opt out of.

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