[PATCH v6] bq27xxx: support interchangeable OnePlus 6/6T fuel gauges

[Rinat Muhamedgaliev via B4 Relay]

OnePlus 6 and 6T replacement battery packs can contain either a bq27411 or a
bq27541 fuel gauge. The latter requires a different register map and produces
invalid battery readings when interpreted as a bq27411.

The I2C driver reads DeviceType while probing either of those compatible
devices and selects the matching profile.

The bq27541 path was tested on a OnePlus 6T with DeviceType 0x0541. It
reported 4.338 V, 100% capacity, 27.8 C, and Full/Good battery status.
Testing on an OnePlus 6 or 6T whose fuel gauge reports DeviceType 0x0421
(bq27411) would be appreciated.

Changes in v6:
- Compare the detected model with the compatible-selected model.
- Support both BQ27411-to-BQ27541 and BQ27541-to-BQ27411 detection.
- Document the pair of models checked at probe time.
- Link to v5: https://patch.msgid.link/20261018-master-v5-0-0be16441cdd1@xxxxxxxxx

Changes in v5:
- Report detected and expected DeviceType values instead of hard-coding chip names.
- Describe an unknown DeviceType as unrecognized.
- Link to v4: https://patch.msgid.link/20260928-master-v4-1-052c73ec1767@xxxxxxxxx

Changes in v4:
- Drop the generic compatible and binding update.
- Keep the established OnePlus DTS unchanged.
- Detect bq27541 from DeviceType in the bq27411 probe path.
- Send as a new thread.

---
Rinat Muhamedgaliev (1):
      power: supply: bq27xxx: detect bq27541 behind bq27411 compatible

 drivers/power/supply/bq27xxx_battery_i2c.c | 57 ++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
---
base-commit: 830b3c68c1fb1e9176028d02ef86f3cf76aa2476
change-id: 20260927-master-bd0afd9696ef

Best regards,
--  
Rinat Muhamedgaliev <rinat.muhamedgaliev@xxxxxxxxx>