More Generic Audio Graph Sound Card idea

[Mark Brown]

On Fri, Aug 21, 2020 at 01:58:15PM +0530, Sameer Pujar wrote:

> For example, SRC (sample rate converter) can change 'rate' info coming from
> hw_param(). Similarly 'mux/demux' can change channel info. Fixing one set of
> configuration in DT will limit the usage. If this is configurable from user
> space, then it would be lot more easier.

We shouldn't be fixing the configuration in DT unless it's fixed in the
hardware, in which case we should be able to figure this out through
constraints at runtime anyway and not need to expose anything to
userspace.  This covers an awful lot of SRC and other conversion use
cases, they're often there because there's some fixed DAI that means
there's only one possible setting on one side of the convertor.  A lot
of the other cases where there's more flexibility can probably be
handled in a similar fashion with something other than the SRC itself
being configured - normally the goal is to fix a link in a particular
configuration through software policy and we can work back to setting up
the SRC in the same way as if it was a hardware constraint.
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