Re: [PATCH] arm64: dts: qcom: sdm845-oneplus: fix fuel gauge compatible

[Konrad Dybcio]

On 8/27/26 1:38 AM, Rinat Muhamedgaliev wrote:
> The fuel gauge at I2C address 0x55 on OnePlus 6T (fajita) reports
> DeviceType 0x0541, identifying it as a TI bq27541 rather than bq27411.
> 
> Binding it as bq27411 selects the wrong register map and produces
> invalid voltage, state-of-charge, and temperature readings. Use the
> bq27541 compatible and rename the shared label along with its fajita
> and enchilada consumers.
> 
> Tested on OnePlus 6T (fajita): queried DeviceType directly over I2C,
> built the DTB, booted it once with fastboot boot, then installed a
> locally built postmarketOS kernel package. Before the change, readings
> included about 65 V, over 10000% SOC, and -273.1 C. Afterward, the
> bq27xxx driver bound as ti,bq27541 and reported 3.835 V, 42% SOC, and
> 33.3 C.
> 
> Fixes: 12dfb002ca01 ("arm64: dts: qcom: sdm845-oneplus-*: add fuel gauge")
> Closes: https://gitlab.com/sdm845-mainline/linux/-/issues/36
> Link: https://gitlab.com/sdm845-mainline/linux/-/merge_requests/148

If I'm reading that thread right, this IC is on the battery itself (?)
and it seems to differ across different units / suppliers, would that
be a good interpretation?

Konrad