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From: Nicolin Chen <Guangyu.Chen@freescale.com>
Subject: Re: [PATCH] ASoC: cs42888: Add codec driver support
Date: Tue, 25 Feb 2014 11:46:36 +0800
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To: Mark Brown <broonie@kernel.org>
Cc: "mark.rutland@arm.com" <mark.rutland@arm.com>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, "Austin,
 Brian" <Brian.Austin@cirrus.com>, "pawel.moll@arm.com" <pawel.moll@arm.com>, "ijc+devicetree@hellion.org.uk" <ijc+devicetree@hellion.org.uk>, "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>, Liam Girdwood <lgirdwood@gmail.com>, "Handrigan,
 Paul" <Paul.Handrigan@cirrus.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "robh+dt@kernel.org" <robh+dt@kernel.org>, "rob@landley.net" <rob@landley.net>, "galak@codeaurora.org" <galak@codeaurora.org>, "grant.likely@linaro.org" <grant.likely@linaro.org>, "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>
List-Id: devicetree@vger.kernel.org

On Tue, Feb 25, 2014 at 12:39:29PM +0900, Mark Brown wrote:
> On Tue, Feb 25, 2014 at 11:13:14AM +0800, Nicolin Chen wrote:
> > On Tue, Feb 25, 2014 at 12:09:47PM +0900, Mark Brown wrote:
> 
> > > We should be able to arrange to have the ESAI be a clock provider
> > > shouldn't we?  If the clocks need to interface to other things (and they
> > > do) then we should be able to use the standard interface we have to
> > > clocks.
> 
> > Excuse me, I think I just don't get the approach how to use clock API to
> > standardize the MCLK derived from ESAI IP: it's surely not a fixed-clock
> > so we couldn't register in DT and it's not SoC internal clock which means
> > we couldn't register it in the SoC clock driver either.
> 
> > Could you please shed me some light on it?
> 
> So register it from the ESAI driver then.

Then I think I need to find a way to pass the clock to CODEC driver...

Anyway, I'll try it first. Thank you.