[RFC PATCH v2 0/5] Apple Macs machine/platform ASoC driver

[Martin Povišer]

Hi all,

This is again RFC with a machine-level ASoC driver for recent Apple Macs
with the M1 line of chips. This time I attached the platform driver too
for good measure. What I am interested in the most is checking the overall
approach, especially on two points (both in some ways already discussed
in previous RFC [0]):

 - The way the platform/machine driver handles the fact that multiple I2S
   ports (now backend DAIs) can be driven by/connected to the same SERDES
   unit (now in effect a frontend DAI). After previous discussion I have
   transitioned to DPCM to model this. I took the opportunity of dynamic
   backend/frontend routing to support speakers/headphones runtime
   switching. More on this in comments at top of the machine and platform
   driver.

 - The way the machine driver deactivates some of the controls where
   suitable, and limits volume on others. I added a new ASoC card method
   to that end.

Kind regards,
Martin

[0] https://lore.kernel.org/linux-devicetree/20220331000449.41062-1-povik+lin@xxxxxxxxxxx/

Martin Povišer (5):
  dt-bindings: sound: Add Apple MCA I2S transceiver
  dt-bindings: sound: Add Apple Macs sound peripherals
  ASoC: apple: Add MCA platform driver for Apple SoCs
  ASoC: Introduce 'fixup_controls' card method
  ASoC: apple: Add macaudio machine driver

 .../bindings/sound/apple,macaudio.yaml        |  157 +++
 .../devicetree/bindings/sound/apple,mca.yaml  |  102 ++
 include/sound/soc-card.h                      |    1 +
 include/sound/soc.h                           |    1 +
 sound/soc/Kconfig                             |    1 +
 sound/soc/Makefile                            |    1 +
 sound/soc/apple/Kconfig                       |   25 +
 sound/soc/apple/Makefile                      |    5 +
 sound/soc/apple/macaudio.c                    | 1004 +++++++++++++++
 sound/soc/apple/mca.c                         | 1122 +++++++++++++++++
 sound/soc/soc-card.c                          |    6 +
 sound/soc/soc-core.c                          |    1 +
 12 files changed, 2426 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/apple,macaudio.yaml
 create mode 100644 Documentation/devicetree/bindings/sound/apple,mca.yaml
 create mode 100644 sound/soc/apple/Kconfig
 create mode 100644 sound/soc/apple/Makefile
 create mode 100644 sound/soc/apple/macaudio.c
 create mode 100644 sound/soc/apple/mca.c

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2.33.0