Hi there, With a multi-codec setup, what's the 'correct' way to tell one codec to be master (i.e. send bit/word clock) and all the others to be slave?

For example, I've got 8 stereo codecs (4x aic34), labeled, say aic_a, aic_b, aic_c, aic_d, aic_e, aic_f, aic_g, aic_h, and I want

aic_a: SND_SOC_DAIFMT_CBM_CFM | SND_SOC_DAIFMT_DSP_A

and all others to see SND_SOC_DAIFMT_CBS_CFS | SND_SOC_DAIFMT_DSP_A

Is there an elegant way to do that?

I see in soc-core.c:snd_soc_runtime_set_dai_fmt(rtd, dai_fmt) that it sets all codecs to the same format, then flips the polarity for the CPU.

It seems this is not really correct behavior in multicodec mode when the codec is master, right? Should there be some way to mark one of the many possibilities as the master?

My current thinking is to not set snd_soc_dai_link.dai_fmt to prevent snd_soc_runtime_set_dai_fmt from doing the wrong thing, then call each individual snd_soc_dai_set_fmt from the init function.

Thanks, --Caleb