[PATCH v3 0/2] ASoC: codecs: Add Everest ES7202 support

[Jun Yan <jerrysteve1101@gmail.com>]

This series adds support for the Everest ES7202, a 2-channel PDM
analog-to-digital converter controlled over I2C.  Patch 1 adds the DT
bindings and patch 2 the ASoC codec driver.

The driver is based on the Rockchip BSP driver, reworked for mainline to
use regmap and devm_ helpers, probe the device ID, and report the actual
per-step PGA gain.

Changes in v3:
- Add SND_SOC_ES7202 to SND_SOC_ALL_CODECS, convert the copyright block
  to C++ comments and drop two unneeded includes.
- Turn the volatile check into a switch: the ID registers are now cached
  after the first read and marked read-only via writeable_reg, so a
  regcache sync never writes them back; ES7202_RESET stays volatile.
- Set use_single_read/use_single_write so a regcache sync cannot become a
  multi-register write.
- Use devm_regulator_get() instead of devm_regulator_get_optional().

Changes in v2:
- Drop the hard-coded 30.75 dB PGA gain from the power-up sequence; the
  PGA keeps its power-on default and the capture volume controls apply
  the requested gain.
- Keep the PDM outputs muted until a capture stream starts, instead of
  unmuting at the end of the init sequence.
- Re-run the power-up sequence on resume before syncing the regmap cache.
- Handle the regulator_get_voltage() error return as an int.
- Drop the unnecessary of_match_ptr().
- Fix the copyright header.

Link to v2: https://lore.kernel.org/linux-sound/20261021124552.767218-1-jerrysteve1101@gmail.com
Link to v1: https://lore.kernel.org/linux-sound/20261020143135.623897-1-jerrysteve1101@gmail.com

Jun Yan (2):
  dt-bindings: sound: add Everest ES7202
  ASoC: codecs: add support for Everest ES7202 PDM ADC

 .../bindings/sound/everest,es7202.yaml        |  56 +++
 sound/soc/codecs/Kconfig                      |  11 +
 sound/soc/codecs/Makefile                     |   2 +
 sound/soc/codecs/es7202.c                     | 373 ++++++++++++++++++
 sound/soc/codecs/es7202.h                     | 131 ++++++
 5 files changed, 573 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/everest,es7202.yaml
 create mode 100644 sound/soc/codecs/es7202.c
 create mode 100644 sound/soc/codecs/es7202.h

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2.56.0