Add support for the TI BQ25792 battery charger

This adds support for the TI BQ25792 battery charger, which is similar in
overall logic to the BQ25703A, but has a different register layout and
slightly different lower-level programming logic.

The series is organized as follows:
- Patch 1 adds the new variant to the existing DT binding, including the
  changes in electrical characteristics
- Patches 2-4 are minor cleanups to the existing BQ25703A OTG regulator
  driver, slimming down the code and making it more reusable for the new
  BQ25792 variant
- Patch 5 is a logical fix to the BQ25703A clamping logic for VSYSMIN
  (this is a standalone fix which can be applied independently and may be
  backported to stable)
- Patches 6-8 are slight refactoring of the existing BQ25703A charger
  driver to make it more reusable for the new BQ25792 variant
- Patch 9 adds platform data to distinguish between the two variants in
  the parent MFD driver, and binds it to the new compatible string
- Patches 10-11 add variant-specific code to support the new BQ25792
  variant in the regulator part and the charger part respectively,
  selected by the platform data added in patch 9

Signed-off-by: Alexey Charkov <alchark@flipper.net>
---
Changes in v6:
- Changed -EINVAL to -ENODEV for non-match cases in the MFD driver, to stay
  in line with what other drivers do in similar situations (Lee Jones)
- Link to v5: https://lore.kernel.org/r/20260324-bq25792-v5-0-0a2eb58cf...

Changes in v5:
- Added non-OF match data and switched to i2c_get_match_data() to support
  non-OF platforms (Lee Jones)
- Shifted the types in the enum to start at 1 to avoid confusion with
  zero-initialized data and non-match cases (Lee Jones)
- Reinstated the const qualifier on the MFD cell array (Lee Jones)
- Link to v4: https://lore.kernel.org/r/20260311-bq25792-v4-0-7213415d9...

Changes in v4:
- Avoid additional data structures and pass 'type' within the existing
  struct bq257xx_device instead (Lee Jones)
- Move comments for new struct fields to the patches where those fields
  are added (Sebastian Reichel)
- Collect tags from Sebastian Reichel (thanks!)
- Link to v3: https://lore.kernel.org/r/20260310-bq25792-v3-0-02f8e232d...

Changes in v3:
- Move MFD cell definitions back out of the probe function (Lee Jones)
- Collect tags from Mark Brown, Krzysztof Kozlowski and Chris Morgan (thanks!)
- Enable ship FET functionality at init for BQ25792
- Link to v2: https://lore.kernel.org/r/20260306-bq25792-v2-0-6595249d6...

Changes in v2:
- Fix an error in DT schema (thanks Rob's bot)
- Ensure the broadest constraints for all variants remain in the common
  part of the schema, per writing-schema doc (thanks Krzysztof)
- Link to v1: https://lore.kernel.org/r/20260303-bq25792-v1-0-e6e5e0033...

---
Alexey Charkov (11):
      dt-bindings: mfd: ti,bq25703a: Expand to include BQ25792
      regulator: bq257xx: Remove reference to the parent MFD's dev
      regulator: bq257xx: Drop the regulator_dev from the driver data
      regulator: bq257xx: Make OTG enable GPIO really optional
      power: supply: bq257xx: Fix VSYSMIN clamping logic
      power: supply: bq257xx: Make the default current limit a per-chip attribute
      power: supply: bq257xx: Consistently use indirect get/set helpers
      power: supply: bq257xx: Add fields for 'charging' and 'overvoltage' states
      mfd: bq257xx: Add BQ25792 support
      regulator: bq257xx: Add support for BQ25792
      power: supply: bq257xx: Add support for BQ25792

 .../devicetree/bindings/mfd/ti,bq25703a.yaml       |  73 ++-
 drivers/mfd/bq257xx.c                              |  54 ++-
 drivers/power/supply/bq257xx_charger.c             | 534 ++++++++++++++++++++-
 drivers/regulator/bq257xx-regulator.c              | 121 ++++-
 include/linux/mfd/bq257xx.h                        | 412 ++++++++++++++++
 5 files changed, 1156 insertions(+), 38 deletions(-)
---
base-commit: 36ece9697e89016181e5ae87510e40fb31d86f2b
change-id: 20260303-bq25792-0132ac86846d

Best regards,
-- 
Alexey Charkov <alchark@flipper.net>