linux-kernel - Re: [alsa-devel] [PATCH v3] ARM: kirkwood: extend the kirkwood i2s driver for DT usage

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Message-ID: <20130723132016.GC9858@sirena.org.uk>
Date:	Tue, 23 Jul 2013 14:20:16 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Jean-Francois Moine <moinejf@...e.fr>, alsa-devel@...a-project.org,
	Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org,
	Liam Girdwood <lgirdwood@...il.com>,
	Rob Herring <rob.herring@...xeda.com>,
	devicetree-discuss@...r.kernel.org,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [alsa-devel] [PATCH v3] ARM: kirkwood: extend the kirkwood i2s
 driver for DT usage

On Tue, Jul 23, 2013 at 02:59:06PM +0200, Sebastian Hesselbarth wrote:
> On 07/23/13 14:34, Mark Brown wrote:

> >As others have pointed out if you need to change the clock get code
> >there's something wrong here, DT should be handled transparently by the
> >clock API.

> IMHO the reason why of_clk_get() was/is mis-used in that way is mostly
> compatibility with legacy platform_data based setup.

I'm sorry, but this doesn't make a great deal of sense to me.  Can you
be more specific?

> As Sascha Hauer pointed out, clocks should be distinguished by names
> (clock-names property) instead of position and then use
> devm_clk_get(&pdev->dev, "internal") and
> devm_clk_get(&pdev->dev, "external") respectively.

> This will possibly also require to update platform_data and legacy
> users of kirkwood-i2s or have different setup functions for non-DT
> and DT.

Why would this be required?  The driver is already asking for multiple
clocks...

> Also, while ASoC API separates the audio-controller into cpu-side
> and codec-side parts, the DT should not. IIRC and as Russell repeated

You mean DAI and DMA here?  I already commented on that in my review of
the DMA binding.

> again, we mentioned to merge kirkwood-i2s.c and kirkwood-dma.c into
> a single file, didn't we?

That's been discussed several times but nobody's actually done it.

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