[alsa-devel] [PATCH 07/22] ASoC: Ux500: Initialise PCM from MSP probe rather than as a device

Mark Brown broonie at opensource.wolfsonmicro.com
Thu Aug 23 16:37:57 CEST 2012

On Thu, Aug 23, 2012 at 02:26:19PM +0100, Lee Jones wrote:

> > I think Ola is suggesting probing the DMA driver from the machine which
> > will also work though I'm not 100% sure if I'm parsing the above
> > correctly.  The issue in DT terms is that if the DMA controller is
> > shared with a bunch of other IPs then it should have one node shared
> > between them all and not a bunch of shim nodes inserted in the middle
> > which only exists due to the way Linux instantiates stuff.

> When you say 'machine', do you mean from arch/<arch>/mach-*? If so, I'm
> keen for that not to happen.

No, sound/soc/ux500/snowball.c or whatever.  At least that's my guess.

> > They instantiate the PCM driver dynamically from the DAI when it's
> > probed which is pretty much what you're patch is doing.

> So they do it in the same why I have with this patch? Do you know why
> Ola might think this is a bad idea?

I'm not 100% sure, I'm guessing it might be down to the fact that you
end up with multiple PCM drivers.  We could avoid that with refcounting
but nobody's really worried about it.
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