linux-kernel - Re: [PATCH 2/2] ARM: Dove: Add the audio device to the Cubox DT

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Date:	Sat, 31 Aug 2013 13:55:19 +0200
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Jason Cooper <jason@...edaemon.net>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: Dove: Add the audio device to the Cubox DT

On Sat, 31 Aug 2013 12:24:31 +0100
Russell King - ARM Linux <linux@....linux.org.uk> wrote:

> > According to the Dove specification, the audio controller works with
> > the samples rates 44.1, 48 and 96 kHz, so, I don't see the usage of the
> > external clock, except when using the two audio controllers with
> > different sample rates.
	[snip]
> > But, BTW, as the kirkwood-i2 driver is written, this last case does not
> > work: for 44.1, 48 and 96 kHz, the external clock is never used and
> > there is only one DCO.  
> 
> This doesn't make sense.  "this last case" - what "case" are you referring
> to?  "there is only one DCO" ?  Yes, there is only one DCO, what is its
> relevance to the statement you're making?  And yes, in mainline we
> currently use the DCO for the standard 44.1, 48 and 96kHz sample rates.
> That's fine.  Confused.

Sorry, it was clear in my head :)

The last case was "when using the two audio controllers with different
sample rates" (I should have added "in the set [44.1, 48, 96 kHz]").
Then, with or without the availability of external clocks, both
controllers will set the unique DCO to two different rates.

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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