Add regulator support for the four ES8316 power domains so
board descriptions can model and control the codec supplies.

The binding patch documents AVDD, CPVDD, DVDD and PVDD as optional
supplies to preserve compatibility with existing device-tree descriptions.
The driver patch requests and enables them before clocking or accessing the
codec, and unwinds them on failure and removal.

The supplies remain enabled over system suspend because the existing
suspend and resume callbacks do not handle a complete power loss.
Powering the codec down would require separate reset and
reinitialization support.

The missing supply model was identified while reviewing the RubikPi 3
audio support:
https://lore.kernel.org/linux-arm-msm/c293d9c7-bdb7-4303-80c8-404228c434d7@oss.qualcomm.com/

Signed-off-by: Hongyang Zhao <hongyang.zhao@thundersoft.com>
---
Hongyang Zhao (2):
      ASoC: dt-bindings: es8316: Add regulator supplies
      ASoC: codecs: es8316: Add regulator support

 .../devicetree/bindings/sound/everest,es8316.yaml  | 16 ++++++++++
 sound/soc/codecs/es8316.c                          | 35 ++++++++++++++++++++--
 2 files changed, 49 insertions(+), 2 deletions(-)
---
base-commit: b4515cf4156356e8f4fe6e0fdc17f59adab9772f
change-id: 20260723-es8316-regulator-next-20260722-7d96badfd4da

Best regards,
-- 
Hongyang Zhao <hongyang.zhao@thundersoft.com>