linux-kernel - Re: [PATCH v4 1/1] ASoc: kirkwood: add DT support to the mvebu audio subsystem

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Message-ID: <20130810111231.GR6427@sirena.org.uk>
Date:	Sat, 10 Aug 2013 12:12:31 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jean-Francois Moine <moinejf@...e.fr>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Rob Herring <rob.herring@...xeda.com>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/1] ASoc: kirkwood: add DT support to the mvebu audio
 subsystem

On Sat, Aug 10, 2013 at 10:31:37AM +0100, Russell King - ARM Linux wrote:

> Right, so what you're proposing is to come up with a DT description for
> the existing stuff, and then have to change (or at the very least augment)
> that description later when the DPCM stuff goes in.

> What should be done is to sort out DPCM, get that working and then sort out
> the DT side of it, so that everyone gets only one transition to DT, not a
> transition to a half-baked stop-gap DT and then have to go through another
> round of DT changes.  "Because we can" is not a good enough reason not to
> get this sorted properly.

Since we know what the hardware physically looks like we should be able
to write a DT binding which can be stable for both before and after the
DPCM transition.  The bindings would have to be truly awful to require a
rewrite here and as with all the DMA wrapper drivers if parts of DPCM
that don't reflect actual hardware are appearing in the DT we're doing
something wrong.

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