Hi Shengju,

  Can DPCM support such a pipeline?
  FE ->  (FE/BE) ->BE
  which means I want to connect several cpu-dai together:
  CPU-DAI1  -> CPU-DAI2 -> CPU-DAI3 -> CPU-DAI4 -> Codec

  Could you please recommend what I can do?  Thanks for you help!

AFAIK, DPCM currently does not support such a pipeline. I am trying to address similar requirement in series [0]. Some of the related discussion you can find in [1].

[0] https://lkml.org/lkml/2020/8/5/42 [1] https://lkml.org/lkml/2020/4/30/519

Thanks, Sameer.