[alsa-devel] [RFC] ASoC: Current state of Dynamic PCM API

Sebastian Hesselbarth sebastian.hesselbarth at gmail.com
Thu Apr 18 14:07:07 CEST 2013


I am rewriting Marvell Kirkwood ASoC driver to also support Dove and
reflect the audio controller's capabilities. The audio controller can
have one DMA stream for playback and capture respectively. While capture
source can be either I2S or SPDIF, playback can be on both interfaces

The setup I have in mind for a generic Kirkwood/Dove soundcard is:

(DMA)-->(CPU_DAI)--+<-->(I2S Codec)
                   +--->(SPDIF TX Codec)
                   +<---(SPDIF RX Codec)

I sent a mail on how to handle multiple codecs on a single cpu_dai
earlier, and Mark pointed me to Dynamic PCM API. Unfortunately,
current mainline ASoC has no driver using DPCM as an example and
integration of DPCM patches look kind-of incomplete to me.

Can any of you point me to patches, repositories, or documentation
about DPCM where I can start with?


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