From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Shujath Mohd <shujath@outlook.in>, linux-arm-msm@vger.kernel.org
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org,
krzk+dt@kernel.org, conor+dt@kernel.org
Subject: Re: [PATCH v2] arm64: dts: qcom: sdm845-sony-tama: Add battery properties
Date: Wed, 9 Sep 2026 11:39:03 +0200 [thread overview]
Message-ID: <77f0e1f7-ed6e-430c-812e-4eb316373937@oss.qualcomm.com> (raw)
In-Reply-To: <PUZPR01MB51418AF84C1FC5F640144D57C3B22@PUZPR01MB5141.apcprd01.prod.exchangelabs.com>
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@outlook.in>
> ---
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
next prev parent reply other threads:[~2026-09-09 9:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-07 16:03 Shujath Mohd
2026-09-08 7:19 ` Abel Vesa
2026-09-08 7:56 ` Shujath Mohd
2026-09-09 9:23 ` Konrad Dybcio
2026-09-09 9:39 ` Konrad Dybcio [this message]
2026-09-10 4:36 ` [PATCH v3] " Shujath Mohd
2026-10-15 12:14 ` Konrad Dybcio
2026-11-08 20:21 ` Bjorn Andersson
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