linux-kernel - Re: [PATCH v6 04/17] dt-bindings: battery: Voltage drop properties

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Message-ID: <CAD++jL=2BdOuJ5+B0QEg8zuX+UGO=sRTrL7oOb0BkqBtfCGZgQ@mail.gmail.com>
Date: Mon, 1 Dec 2025 14:21:54 +0100
From: Linus Walleij <linusw@...nel.org>
To: Matti Vaittinen <mazziesaccount@...il.com>
Cc: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>, Lee Jones <lee@...nel.org>, 
	Pavel Machek <pavel@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Sebastian Reichel <sre@...nel.org>, Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, 
	Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, 
	Alexandre Belloni <alexandre.belloni@...tlin.com>, linux-leds@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, linux-clk@...r.kernel.org, 
	linux-gpio@...r.kernel.org, linux-rtc@...r.kernel.org, 
	Andreas Kemnade <andreas@...nade.info>
Subject: Re: [PATCH v6 04/17] dt-bindings: battery: Voltage drop properties

On Thu, Nov 27, 2025 at 12:18 PM Matti Vaittinen
<matti.vaittinen@...ux.dev> wrote:

> From: Matti Vaittinen <mazziesaccount@...il.com>
>
> ROHM has developed a so called "zero-correction" -algorithm to improve
> the fuel-gauging accuracy close to the point where battery is depleted.
> This relies on battery specific "VDR" (voltage drop rate) tables, which
> are measured from the battery, and which describe the voltage drop rate.
> More thorough explanation about the "zero correction" and "VDR"
> parameters is here:
> https://lore.kernel.org/all/676253b9-ff69-7891-1f26-a8b5bb5a421b@fi.rohmeurope.com/
>
> Document the VDR zero-correction specific battery properties used by the
> BD71815, BD71828, BD72720 and some other ROHM chargers. (Note, charger
> drivers aren't upstream yet).
>
> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
> Reviewed-by: Rob Herring (Arm) <robh@...nel.org>

I like this even more!
Reviewed-by: Linus Walleij <linusw@...nel.org>

Yours,
Linus Walleij