linux-kernel - Re: [PATCH v2 03/13] arm64: dts: qcom: sdm845-lg-judyln: Add battery and charger

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Message-ID: <aPnxgXU7VFCpvk2w@duo.ucw.cz>
Date: Thu, 23 Oct 2025 11:12:33 +0200
From: Pavel Machek <pavel@....cz>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Paul Sajna <sajattack@...tmarketos.org>,
	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>,
	David Heidelberg <david@...t.cz>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	phone-devel@...r.kernel.org,
	Amir Dahan <system64fumo@...tonmail.com>,
	Christopher Brown <crispybrown@...il.com>
Subject: Re: [PATCH v2 03/13] arm64: dts: qcom: sdm845-lg-judyln: Add battery
 and charger

On Wed 2025-09-17 15:47:47, Konrad Dybcio wrote:
> On 9/17/25 3:09 AM, Paul Sajna wrote:
> > From: Christopher Brown <crispybrown@...il.com>
> > 
> > Values based on lineageos kernel
> 
> A link for reference would be nice to see
> 
> > 
> > Signed-off-by: Christopher Brown <crispybrown@...il.com>
> > ---
> >  arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts b/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts
> > index 49225e4fa80e5f45a36964d5d733dc238e4413f8..be488891d0ab01c5bfd3762514fbf1c3bbf6845a 100644
> > --- a/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts
> > +++ b/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts
> > @@ -37,6 +37,14 @@ key-thinq {
> >  			interrupts = <89 IRQ_TYPE_LEVEL_LOW>;
> >  		};
> >  	};
> > +
> > +	battery: battery {
> > +		compatible = "simple-battery";
> > +
> > +		charge-full-design-microamp-hours = <3000000>;
> > +		voltage-min-design-microvolt = <3200000>;
> 
> 3.2 is rather low.. are you sure?

In flashlights (etc), Li-IONs are often pulled down to 3.00V. It does
not have any great advantage because it goes down from 3.3 to 3.0V
pretty quickly, but it is not completely insane.

Actually, under load, it may make sense: internal voltage will be
higher at that point.

Best regards,
								Pavel

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