ASoC dailink capture/playback flags

[Mark Brown]

On Tue, May 19, 2020 at 09:25:31PM -0500, Pierre-Louis Bossart wrote:

> So here are the questions:

> - when using DPCM, is there an expectation to use dpcm_ flags only?

> - should we instead use playback/capture_only when only one of the two dpcm_
> flags is set?

> - should we flags errors if we ever encounter cases with e.g. dpcm_playback
> = true and capture_only = true?

TBH I'm not convinced DPCM is well enough tied together to have clear
answers on this.  I don't really know what those DPCM level flags are
doing.

> - do we actually need two sets of definitions? There are very few users of
> the .playback_only and .capture_only flags and only a single place where
> it's checked in soc-pcm.c

We could probably do a driver only thing for the i.MX stuff if we had
to.
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