Re: [PATCH v2] arm64: dts: qcom: sdm845-sony-tama: Add battery properties

[Konrad Dybcio]

On 9/7/26 6:03 PM, Shujath Mohd wrote:
> Add simple-battery nodes describing the design capacity and voltage
> limits of the Xperia TAMA batteries.
> 
> The Xperia XZ2, XZ2 Compact, and XZ3 use 3.4 V as the drained
> battery voltage and 4.245 V as the fully charged voltage.
> 
> Signed-off-by: Shujath Mohd <shujath@xxxxxxxxxx>
> ---

In the downstream kernel, I see:

fg-gen3-batterydata-akari-byd-4250mv.dtsi
fg-gen3-batterydata-akari-byd-4300mv.dtsi
fg-gen3-batterydata-akari-byd-4340mv.dtsi
fg-gen3-batterydata-akari-byd-4380mv.dtsi

fg-gen3-batterydata-akari-tmm-4250mv.dtsi
fg-gen3-batterydata-akari-tmm-4300mv.dtsi
fg-gen3-batterydata-akari-tmm-4340mv.dtsi
fg-gen3-batterydata-akari-tmm-4380mv.dtsi

fg-gen3-batterydata-akatsuki-tmm-4250mv.dtsi
fg-gen3-batterydata-akatsuki-tmm-4300mv.dtsi
fg-gen3-batterydata-akatsuki-tmm-4340mv.dtsi
fg-gen3-batterydata-akatsuki-tmm-4380mv.dtsi

fg-gen3-batterydata-apollo-tmm-4250mv.dtsi
fg-gen3-batterydata-apollo-tmm-4300mv.dtsi
fg-gen3-batterydata-apollo-tmm-4340mv.dtsi
fg-gen3-batterydata-apollo-tmm-4380mv.dtsi

fg-gen3-batterydata-aurora-tmm-4250mv.dtsi
fg-gen3-batterydata-aurora-tmm-4300mv.dtsi
fg-gen3-batterydata-aurora-tmm-4340mv.dtsi
fg-gen3-batterydata-aurora-tmm-4380mv.dtsi

so XZ2 has 2 battery suppliers, while Premium/Compact and
XZ3 only have one. The -mv suffixes I deciphered to be tuned
settings for various aging levels.

The BYD vs TMM batteries on Akari have a different capacity,
and public spec sheets match neither :)

BYD says initial capacity = 3056000 uAh
TMM says initial capacity = 3217000 uAh

the spec sheet says 3180 mAh, so presumably the TMM one was
used in all models

The constant current charge threshold is set to 4370 on the
-4380mv bin and the DTs don't clearly specify a lower bound
(maybe in the qcom,fg-data blob?), but 3.4 sounds appropriate

Konrad