[alsa-devel] simple-card: DAI link creation

[Daniel Baluta]

Hello Morimoto-san,

I want to know your opinion on enhancing simple-card in order to be
able to create
more flexible links.

So far, simple-card allows the following cases:

1) normal sound

all DAIs are detected as CPU - Codec (+optional platform).

2) DPCM sound

2a) all CPUs are detected CPU - <dummy_codec> [FE]
2b) all codecs are detected <dummy_cpu> - codec [BE]

I will need to have a third case where I need to create
a back end link like this:

link->cpus->of_node  = <&my_dai>;
link->codecs->of_node = <&my_codec>;
link->platforms->of_node = <&my_platform>;
link->no_pcm = 1;

Somehow, similar with qcom_snd_parse_of from
sound/soc/qcom/common.c.

Do you think it would be OK to create another file to handle this case
in sound/soc/generic?

Also, I would really like one day to really understand the role
of cpu/platform/codec for a FE/BE.

In the case of the FE:
- cpu dai
- platform
- codec, here it makes sense to be dummy codec.

In the case of BE:
- cpu_dai
- platform
- codec, here it make sense to be reference to a real codec

In the case of normal link:
- cpu_dai, here it makes sense is a physical DAI
- platform
- codec, here it makes sense it is a physical codec.

thanks,
Daniel.