[alsa-devel] About the platform_name field in snd_soc_dai_link

Sascha Hauer s.hauer at pengutronix.de
Tue Aug 10 15:38:18 CEST 2010


I'm wondering what exactly a snd_soc_platform is. Apparently the
snd_pcm_ops/pcm_new/pcm_free are specific to a platform. For my
understanding these operations are more specific to a cpu_dai. Looking
at the tree it seems that each cpu_dai has exactly one possible
platform, which seems logical to me because the cpu_dai knows how to
transfer the data.

My problem on i.MX is that I currently have two possible cpu dais
(imx-ssi.[01]) and each can be configured to use dma or fiq depending
on the dma capabilities. So the cpu_dai knows which pcm_ops we have
to use, but currently it's the soc glue code which has to decide in
platform_name. Am I understanding something wrong here?


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