linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: msm8939-asus-z00t: add battery

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Message-ID: <c44faf76-852c-4bec-8e8d-6ea7d79ab48a@oss.qualcomm.com>
Date: Mon, 17 Nov 2025 13:30:16 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Erikas Bitovtas <xerikasxx@...il.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH 1/2] arm64: dts: qcom: msm8939-asus-z00t: add battery

On 11/15/25 1:26 PM, Erikas Bitovtas wrote:
> This device tracks remaining battery capacity percentage using voltage
> mode BMS. This commit enables the pm8916_bms node and adds a battery
> node to track its capacity. Battery properties were taken from the
> downstream code and from the information printed on the battery itself.
> 
> Signed-off-by: Erikas Bitovtas <xerikasxx@...il.com>
> ---
>  arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
> index ebb548e62e02..b58f0a04abfd 100644
> --- a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
> +++ b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
> @@ -20,6 +20,25 @@ aliases {
>  		serial0 = &blsp_uart2;
>  	};
>  
> +	battery: battery {
> +		compatible = "simple-battery";
> +		device-chemistry = "lithium-ion-polymer";
> +		voltage-min-design-microvolt = <3400000>;
> +		voltage-max-design-microvolt = <4400000>;
> +		energy-full-design-microwatt-hours = <11500000>;
> +		charge-full-design-microamp-hours = <3000000>;
> +
> +		ocv-capacity-celsius = <25>;
> +		ocv-capacity-table-0 = <4372000 100>, <4306000 95>, <4247000 90>,
> +			<4190000 85>, <4134000 80>, <4081000 75>, <4030000 70>,
> +			<3984000 65>, <3930000 60>, <3884000 55>, <3850000 50>,
> +			<3826000 45>, <3804000 40>, <3786000 35>, <3770000 30>,
> +			<3753000 25>, <3734000 20>, <3712000 16>, <3693000 13>,
> +			<3686000 11>, <3684000 10>, <3682000 9>, <3680000 8>,
> +			<3676000 7>, <3668000 6>, <3643000 5>, <3600000 4>,
> +			<3542000 3>, <3462000 2>, <3340000 1>, <3000000 0>;

I found a dts for this phone and it seems like there's 3 kinds of
batteries which quite obviously have disjoin characteristics

https://github.com/Asus-MSM8916/android_kernel_asus_msm8916/blob/10.x/arch/arm/boot/dts/qcom/ASUS_ZE550KL_1936167_3000mAh_3p4COV_VBMS_Final.dtsi

https://github.com/Asus-MSM8916/android_kernel_asus_msm8916/blob/10.x/arch/arm/boot/dts/qcom/ASUS_ZE550KL_1949572_3000mAh_3p4COV_VBMS_Final.dtsi

https://github.com/Asus-MSM8916/android_kernel_asus_msm8916/blob/10.x/arch/arm/boot/dts/qcom/ASUS_ZE550KL_2024958_3000mAh_120mAcc_3p4COV_VBMS_Final.dtsi

I don't think we have a mechanism to handle that in the kernel just yet..
At least documenting which one you based this data on would be nice..

Konrad