[1/3][PATCH][upstream]Adding documentation for TDM

[David Laight]

> > For flexibility you need to allow for 8bit samples being converted
as:
> > 1) 8bit raw ulaw or alaw data (unchanged from line).
> > 2) 8bit raw data, bit reversed, any hdlc protocol
> >    is bit reversed from audio [1].
> > 3) 8bit audio, converted from alaw to ulaw
> > 4) 8bit audio, converted from ulaw to alaw
> > 5) 16bit linear converted to/from alaw or ulaw and on a per-timeslot
> > basis.
> I agree. That we only support very limited samples. But We can add
this
> in second step once the basic framework is in.
> Also right now the testing infrastructure we have, we won't be able to
> test all these scenarios.

You probably ought to make the application request a specific
format - and error the unsupported ones.
That would make it easier to add support for other formats
later.

I also suspect that this 'framework' isn't that general!
We (as a company) use the TDM interface blocks on the MSC8101
and MSC8013 Starecore DSPs as well as some bespoke FPGA logic
(which will do ulaw<->alaw convertion).
The 'framework' would almost certainly be inappropriate
for both out hardware and software.

	David