Re: [alsa-devel] [PATCH v4] ASoC: add imx-sgtl5000 machine driver working with fsl_ssi

[Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>]

On Wed, Mar 14, 2012 at 06:02:44PM -0500, Timur Tabi wrote:
> Sascha Hauer wrote:
> > What are the next steps here? Now we have fsl_ssi.c and imx-ssi.c, one
> > for dt bindings and the other one for platform bindings and also AC97
> > support. They should probably get merged some day which might be a bit
> > difficult since currently I don't see the platform users moving over
> > to devicetree and the seem to be no AC97 users in powerpc.
> 
> I don't have any problem with adding AC97 support to fsl_ssi.c, assuming
> it's not a huge mess.  I don't know enough about AC97 to know how easy
> that is, though.

>From the hardware side it's basically calling setup_channel_to_ac97()
and providing AC97 register read/write functions. One ugly detail is
that we need a bus reset function. This basically means putting the
pins in gpio mode and issuing the reset manually. The SSI unit does
not provide a way to reset the bus.
I don't know how this AC97 stuff integrates into the devicetree. Anyway,
that's a topic for future discussions and shouldn't block the current
patches. I just want to make sure that the original imx-ssi driver is
not removed as long as the fsl_ssi driver does not have AC97 support.

Sascha

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