[PATCH RFC v4 0/6] ASoC: Add Multi CPU DAI support

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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.

[1]: https://www.spinics.net/lists/alsa-devel/msg71369.html

changes in v4:
 - fix "rtd->num_codecs > 1" error in ASoC: Add Multi CPU DAI support
 - split "ASoC: pcm: check if cpu DAI support the given stream" from
   "ASoC: Add multiple CPU DAI support for PCM ops"
 - add helper "ASoC: Add dapm_add_valid_dai_widget helper" for
   "ASoC: Add multiple CPU DAI support in DAPM" 

Bard Liao (2):
  ASoC: return error if the function is not support multi cpu yet.
  ASoC: pcm: check if cpu DAI support the given stream

Shreyas NC (4):
  ASoC: Add initial support for multiple CPU DAIs
  ASoC: Add multiple CPU DAI support for PCM ops
  ASoC: Add dapm_add_valid_dai_widget helper
  ASoC: Add multiple CPU DAI support in DAPM

 include/sound/soc.h                   |  15 +
 sound/soc/soc-compress.c              |   5 +-
 sound/soc/soc-core.c                  | 205 +++++-----
 sound/soc/soc-dapm.c                  | 133 ++++---
 sound/soc/soc-generic-dmaengine-pcm.c |  18 +
 sound/soc/soc-pcm.c                   | 554 ++++++++++++++++++--------
 6 files changed, 615 insertions(+), 315 deletions(-)

-- 
2.17.1

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