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SubjectRe: Re: [PATCH v4 12/23] ASoC: simple-card: Support DPCM DAI link with multiple Codecs

On 6/30/2020 4:31 PM, Mark Brown wrote:
> On Tue, Jun 30, 2020 at 01:22:29PM +0530, Sameer Pujar wrote:
>> Yes there are complex use cases, but if we look at the amount of changes
>> required in simple-card driver that is not too much. Existing binding for
>> simple-card driver would still work fine for our cases. Yes there are some
>> deviations and we don't want to break existing users, that is why a *new*
>> compatible was introduced and specific items can be pushed under it.
>> Majority of the simple-card driver is getting re-used here. We just need to
>> make sure it does not affect anyone else.
> Why simple-card and not audio-graph-card?

Frankly speaking I have not used audio-graph-card before. I had a brief
look at the related binding. It seems it can use similar DT properties
that simple-card uses, although the binding style appears to be
different. However I am not sure if it offers better solutions to the
problems I am facing. For example, the ability to connect or form a
chain of components to realize more complicated use cases with DPCM,
some of which were discussed in [0]. Can you please help me understand
why it could be preferred?


>>> Using fe/be instead of cpu/codec is easy to understand.
>> I guess you are referring to DT binding part. The parsing code specifically
>> looks for "codec" sub node and thus present conventions had to be used.
> Remember that this stuff gets fixed into the ABI so we'd have to live
> with this for ever.

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