linux-kernel - Re: [PATCH 13/18] ARM: ux500: Add ux500 PCM to DB8500 Device Tree

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Message-ID: <20120730134054.GC4468@opensource.wolfsonmicro.com>
Date:	Mon, 30 Jul 2012 14:40:54 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	STEricsson_nomadik_linux@...t.st.com, linus.walleij@...ricsson.com,
	arnd@...db.de, olalilja@...oo.se, ola.o.lilja@...ricsson.com,
	alsa-devel@...a-project.org, lrg@...com
Subject: Re: [PATCH 13/18] ARM: ux500: Add ux500 PCM to DB8500 Device Tree

On Mon, Jul 30, 2012 at 08:32:43AM +0100, Lee Jones wrote:
> On 29/07/12 21:50, Mark Brown wrote:
> >On Fri, Jul 27, 2012 at 01:45:57PM +0100, Lee Jones wrote:

> >>+		pcm: ux500-pcm {
> >>+			compatible = "stericsson,ux500-pcm";
> >>+		};
> >>+

> >One of two things is wrong here.  Either you've not provided any
> >information about the hardware so the driver won't be able to work out
> >what to talk to or you've not provided any data so you're registering a
> >purely virtual Linux-internal device via the device tree.

> >Once more, the idea here is to describe the hardware not to dump Linux's
> >internal data structures into the device tree.

> We use it register the driver for probe()ing. In the same way we do
> for the PMU and Regulators. All three of which actually belong to a
> different hardware block. Do you know of a better way to register
> those devices?

You've not identified which of the two cases above we're in...  assuming
it's a virtal device look at how the DT bindings for the other platforms
are doing things.
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