Alternative binding proposal for tda998x audio (Was: Re: [PATCH RFC v5 4/8] drm/i2c: tda998x: Add support of a DT graph of ports)

[Mark Brown]

On Tue, Mar 01, 2016 at 05:16:30PM +0100, Jean-Francois Moine wrote:

> As told many times, the simple card is a pure Linux specific entity.
> It does not describe any hardware. It should not appear in a DT, or,

The physical integration of audio systems is meaningful hardware that
physically exists and matters to software.  I am completely fed up of 
having to go through this, I'm fairly sure I've been through it with you
before.

> if it does, its compatible should be "linux, simple-audio-card".

Documentation/SubmittingPatches.

> Then, how can the other OSs know the links between the audio
> devices and the audio encoders/connectors?

Documentation/devicetree/bindings/sound/simple-card.txt

> On the other way, the audio graph does not impose any particular
> software design. It just describes the links between the different
> hardware components and each OS is free to implement its own layout.

So long as there is no effort on actually upstreaming a graph based card
that shows realistic signs of getting merged in a useful form it doesn't
meaningfully exist.  Right now nobody is even trying to do that.

If you are concerned about simple-card being too Linux specific then by
all means add board specific bindings, preferably ones that can just be
added to simple-card as a compatible string.
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