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

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

[Rinat Muhamedgaliev]

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
Signed-off-by: Rinat Muhamedgaliev <rinat.muhamedgaliev@gmail.com>
---
 arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi   | 4 ++--
 arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts | 2 +-
 arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts    | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
index 948a0dd18..0c6203fa8 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
@@ -790,8 +790,8 @@ &i2c10 {
 	status = "okay";
 	clock-frequency = <100000>;
 
-	bq27441_fg: bq27441-battery@55 {
-		compatible = "ti,bq27411";
+	bq27541_fg: bq27541-battery@55 {
+		compatible = "ti,bq27541";
 		status = "okay";
 		reg = <0x55>;
 	};
diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts b/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts
index 5f01115e2..21ebd3f67 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts
@@ -44,7 +44,7 @@ main_cam_ois: main-cam-ois-regulator {
 	};
 };
 
-&bq27441_fg {
+&bq27541_fg {
 	monitored-battery = <&battery>;
 };
 
diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts b/arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts
index 7ffcad24d..d640b38b5 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts
@@ -67,7 +67,7 @@ tfa9894_codec: tfa9894@34 {
 
 };
 
-&bq27441_fg {
+&bq27541_fg {
 	monitored-battery = <&battery>;
 };
 
-- 
2.55.0

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

[Krzysztof Kozlowski]

On 27/08/2026 01:38, 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

This is fine.

> Link: https://gitlab.com/sdm845-mainline/linux/-/merge_requests/148

But link seems irrelevant here. We do not reference downstream PRs in
upstream commits, because it should go the other way.

Please drop it.


> Signed-off-by: Rinat Muhamedgaliev <rinat.muhamedgaliev@gmail.com>
> ---
>  arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi   | 4 ++--
>  arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts | 2 +-
>  arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts    | 2 +-
>  3 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
> index 948a0dd18..0c6203fa8 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
> @@ -790,8 +790,8 @@ &i2c10 {
>  	status = "okay";
>  	clock-frequency = <100000>;
>  
> -	bq27441_fg: bq27441-battery@55 {
> -		compatible = "ti,bq27411";
> +	bq27541_fg: bq27541-battery@55 {

If renaming it, then node name should be fuel-gauge@.


Best regards,
Krzysztof

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