[alsa-devel] [PATCH RFC v2 0/4] ASoC: Add Multi CPU DAI support

[Pierre-Louis Bossart]

On 1/14/20 11:51 AM, Bard liao wrote:
> As discussed in [1], ASoC core supports multi codec DAIs
> on a DAI link. However it does not do so for CPU DAIs.
> 
> So, add support for multi CPU DAIs on a DAI Link by adding
> multi CPU DAI in Card instantiation, suspend and resume
> functions, PCM ops, stream handling functions and DAPM.

Maybe a tangential question, but I am a bit confused on the code cleanups.

After this series of patches is applied, we have this in soc.h:

	struct snd_soc_dai *codec_dai;
	struct snd_soc_dai *cpu_dai;

	struct snd_soc_dai **codec_dais;
	unsigned int num_codecs;

	struct snd_soc_dai **cpu_dais;
	unsigned int num_cpus;

What is the intent behind keeping the two fields codec_dai and cpu_dai?

Shouldn't we use the multi-dai structures in all cases, possible 
degraded to a single element rather than maintaining what looks like 
duplicate ways of accessing the same element?

If removing these fields across all drivers is just too invasive for 
now, shouldn't we start defining access macros so that those fields can 
be deprecated and removed at a later time, platform-by-platform?

Thanks
-Pierre