linux-kernel - Re: [PATCH] ARM: kirkwood: extend the kirkwood pcm/dma driver for DT usage

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Message-ID: <20130723132948.GF9858@sirena.org.uk>
Date:	Tue, 23 Jul 2013 14:29:48 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	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-discuss@...r.kernel.org
Subject: Re: [PATCH] ARM: kirkwood: extend the kirkwood pcm/dma driver for DT
 usage

On Tue, Jul 23, 2013 at 02:23:14PM +0100, Russell King - ARM Linux wrote:
> On Tue, Jul 23, 2013 at 01:57:56PM +0100, Mark Brown wrote:

> > This device has no registers or other hardware - this looks like a stub
> > device which shouldn't be visible in DT but should instead be created by
> > the I2S driver - look at how most of the other DT platforms using
> > dmaengine work.

> There is no separate DMA engine on this platform.  dmaengine is totally
> irrelevant to this hardware.

The pattern for instantiating a DMA controller that's integrated into
the DAI is the same as that where the DMA controller is a shared IP
accessed via dmaengine so it's still useful to look at these platforms
to see how to do the instnatiation.

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