[PATCH v5] bq27xxx: support interchangeable OnePlus 6/6T fuel gauges

[Rinat Muhamedgaliev]

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.

v4 drops the proposed generic DT compatible and DTS changes. The I2C driver
instead reads DeviceType while probing the existing bq27411 compatible, and
selects the bq27541 profile if the device reports 0x0541.

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 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 | 39 ++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
---
base-commit: 830b3c68c1fb1e9176028d02ef86f3cf76aa2476
change-id: 20260927-master-bd0afd9696ef

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