[alsa-devel] ASoC: new ac97 bus and codec clock

[Mark Brown]

On Wed, Jun 20, 2018 at 11:16:15AM -0600, Rob Herring wrote:

> Does AC97 specify a common programming model? That's were a common
> compatible is used (though experience has proven things like
> "generic-ehci" are don't work).

Yes, there is a standard register interface which all AC'97 CODECs
implemented and which does work effectively for drivers that only use
that.  Devices can offer extensions which do need specific drivers, and
there are ID registers which can be used to enumerate.  However one of
the things that some of the devices targetted at embedded systems do is
offer non-standard clocking features that need some configuration during
initialization (and may need to work with input clocks too) which
complicates things, especially in the context of DT.
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