[PATCH] ASoC: simple-card: Add dummy dai support simple sound card

[Mark Brown]

On Fri, Feb 26, 2021 at 02:05:29PM +0800, Shengjiu Wang wrote:
> On Thu, Feb 25, 2021 at 9:17 PM Mark Brown <broonie at kernel.org> wrote:
> > On Thu, Feb 25, 2021 at 08:08:32PM +0800, Shengjiu Wang wrote:

> > > If sound card doesn't need specific codec device, just
> > > dummy codec is enough, then we can link the dummy component
> > > directly.

> > This is a big red flag - what circumstances are these?  If it's a simple
> > CODEC with no control then the general approach is to provide a driver
> > which announces the capabilities of the CODEC and can be bound to as
> > normal, the dummy component should never actively be used.

> For the DMIC, SPDIF, HDMI ARC device or other
> similar device that there is no codec connected,  then dummy codec is
> just used for registering the sound card.

There are logical CODECs there, and we already have devices set up for
those (like dmic.c for example).  All the above cases have at least
some constraints from the spec for the interface.
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