More Generic Audio Graph Sound Card idea

[Mark Brown]

On Fri, Aug 21, 2020 at 01:15:41PM +0900, Kuninori Morimoto wrote:

> I'm thinking below style as new audio-graph-card2.
> It is not tricky, thus connection judgement for normal vs DSP is easy.
> Then, code can be more readable (= no guaranty :P) ?

Having an audio-graph-card2 isn't ideal but may be required at least
during development :/  Ideally we'd be able to have the new driver parse
both binding formats (or rather, have the new binding format be new use
cases for the same binding format) and only use -card2 while it's in
development.

>   | Front End PCMs    |  SoC DSP  | Back End DAIs | Audio devices |
>   
>                       *************
>   PCM0 <------------> *           * <----DAI0-----> Codec Headset
>                       *           *
>   PCM1 <------------> *           * <----DAI1-----> Codec Speakers
>                       *   DSP     *
>   PCM2 <------------> *           * <----DAI2-----> MODEM
>                       *           *
>   PCM3 <------------> *           * <----DAI3-----> BT
>                       *           *
>                       *           * <----DAI4-----> DMIC
>                       *           *
>                       *           * <----DAI5-----> FM
>                       *************

I think your plan with this explicit representation of the DSP is where
we want to get to, the issue is mapping this onto DPCM as it currently
stands.  The binding you proposed underneath looked sensible on first
readthrough.
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