[alsa-devel] How to select input from muxer in front of SSI on i.MX6

[Mark Brown]

On Wed, Oct 08, 2014 at 05:24:49PM +0200, Jean-Michel Hautbois wrote:
> 2014-09-24 10:21 GMT+02:00 Mark Brown <broonie at kernel.org>:

> > No, that's really not what DPCM is all about...  if this is a physically
> > separate device that's not got direct memory access it's probably more
> > appropriate to represent as a CODEC.  I was CCed in part way so don't
> > entirely know.

> OK, sorry for my late answer, but I was on a lot of things at the same time :/.
> Well, here is a tentative to explain what I want to do :
> http://paste.kde.org/pwijzty2p
> The objective is to develop the "Mux I²S" part, as this is in fact a
> FPGA with I²C registers which tell which input should go on which
> output.

OK, this probably does fit best with DPCM at this point of view as it is
such a simple straight through connection.  At least it's probably the
lowest impedence way of doing things right now, it's not really what we
want to do longer term though.

> I am reading Alsa docs, in order to fully understand what should be
> done, but it seems that this is nothing more than a simple codec with
> no effect on audio parameters... It should be visible in alsa mixer
> though, in order to drive the inputs from user space easily.

Even a dumb CODEC at least has the effect of limitng the configurations
that can be used.
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