[PATCH v2 0/4] ASoC: cdns: Add Cadence I2S-SC and I2S-MC controller support

[joakim.zhang@cixtech.com]

From: Joakim Zhang <joakim.zhang@cixtech.com>

This series adds support for the Cadence I2S-SC and I2S-MC controllers
integrated in the CIX SKY1 audio subsystem, together with their DT
bindings.

I2S-SC provides full-duplex stereo playback and capture in standard
I2S, left/right-justified and DSP modes, along with TDM operation
supporting up to 16 slots. I2S-MC provides multi-channel playback and
capture through a configurable set of its 8 data pins, described by
cix,pin-out-num, cix,pin-rx-mask and cix,pin-tx-mask, and exposes a
transmit DAI and a receive DAI.

Both drivers register the dmaengine PCM helper, select the audio
reference clock parent for the 8 kHz or 11.025 kHz sample rate family
and keep the minimum functional-clock to bit-clock ratio required for
safe clock domain crossing.

Changes in v2:
- Move the IRQ request after the clocks are enabled and the reset is
  released, so the handler never runs against unclocked hardware.
- Disable the IRQ before switching the regcache to cache-only mode on
  suspend, and re-enable it only after the cache is synced on resume;
  check the status read in the ISR (both drivers).
- Replace the manual runtime PM bookkeeping with devm_pm_runtime_enable()
  and drop the remove() callbacks (both drivers).
- Switch to RUNTIME_PM_OPS()/SYSTEM_SLEEP_PM_OPS() wrapped in pm_ptr()
  and drop the __maybe_unused annotations (both drivers).
- Serialize the shared transceiver clock state in prepare() against the
  trigger() state machine with the existing spinlock (I2S-SC).
- Disable clocks in the reverse order of enablement (both drivers).
- Sort the cdns/ entry into the vendor list in sound/soc/Makefile and
  switch sound/soc/cdns/Makefile to the '-y' object syntax.
- Clean up the includes and initializer style (both drivers).
- Add a NULL check for the match data in probe (both drivers).
- Factor the MC transmitter and receiver configuration into a shared
  helper.
- Drop the compatible string from the DMAC stub node in the binding
  examples.

Signed-off-by: Joakim Zhang <joakim.zhang@cixtech.com>

Joakim Zhang (4):
  ASoC: dt-bindings: Add Cadence I2S-SC controller
  ASoC: cdns: Add Cadence I2S-SC controller driver
  ASoC: dt-bindings: Add Cadence I2S-MC controller
  ASoC: cdns: Add Cadence I2S-MC controller driver

 .../bindings/sound/cix,sky1-i2s-mc.yaml       |  123 ++
 .../bindings/sound/cix,sky1-i2s-sc.yaml       |   93 ++
 sound/soc/Kconfig                             |    1 +
 sound/soc/Makefile                            |    1 +
 sound/soc/cdns/Kconfig                        |   21 +
 sound/soc/cdns/Makefile                       |    7 +
 sound/soc/cdns/cdns-i2s-mc.c                  | 1121 ++++++++++++++++
 sound/soc/cdns/cdns-i2s-sc.c                  | 1160 +++++++++++++++++
 8 files changed, 2527 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/cix,sky1-i2s-mc.yaml
 create mode 100644 Documentation/devicetree/bindings/sound/cix,sky1-i2s-sc.yaml
 create mode 100644 sound/soc/cdns/Kconfig
 create mode 100644 sound/soc/cdns/Makefile
 create mode 100644 sound/soc/cdns/cdns-i2s-mc.c
 create mode 100644 sound/soc/cdns/cdns-i2s-sc.c

-- 
2.50.1