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

[Sameer Pujar]

On 6/30/2020 9:02 PM, Mark Brown wrote:
> On Tue, Jun 30, 2020 at 06:23:49PM +0530, Sameer Pujar wrote:
>> On 6/30/2020 4:31 PM, Mark Brown wrote:
>>> 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?
>> [0] https://lkml.org/lkml/2020/4/30/519
> It's the more modern thing which covers everything simple-card does and
> more, I'd expect new development to go into that rather than
> simple-card.

Hi Mark & Kuninori,

For the HW I am using, there are no fixed endpoints and I am not sure if 
it is allowed to have empty endpoints in audio-graph-card. 
Crossbar/router provides the flexibility to connect the components in 
any required order. Patch [05/23] exposes required graph and MUX 
controls for the flexible configurations. Mostly, in DT, I am trying to 
model the component itself and finally router can help me specify the 
audio path to interconnect various components. Hence I was trying to 
understand if it is really necessary to represent the links using 
audio-graph-card. Kindly help me understand what more it offers. If 
simple-card works fine, are we allowed to use it?

Thank you,
Sameer.