From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Rinat Muhamedgaliev <rinat.muhamedgaliev@gmail.com>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>
Cc: Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Caleb Connolly <caleb@connolly.tech>,
Frederic Laing <dev@fredfunk.tech>
Subject: Re: [PATCH] arm64: dts: qcom: sdm845-oneplus: fix fuel gauge compatible
Date: Fri, 28 Aug 2026 12:05:42 +0200 [thread overview]
Message-ID: <60faed5e-8a19-4eea-8272-145aca3db2d9@oss.qualcomm.com> (raw)
In-Reply-To: <20260826233818.124278-1-rinat.muhamedgaliev@gmail.com>
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
prev parent reply other threads:[~2026-08-28 10:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-26 23:38 [PATCH] arm64: dts: qcom: sdm845-oneplus: fix fuel gauge compatible Rinat Muhamedgaliev
2026-08-27 21:43 ` Krzysztof Kozlowski
2026-08-28 10:05 ` Konrad Dybcio [this message]
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