linux-kernel - Re: [PATCH v3 02/16] dt-bindings: battery: Clarify trickle-charge

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Message-ID: <CACRpkdbP-GZXtj_-AuZ=q8zUKwt0qWQ1L6v7WsoQ50JwTs6JUA@mail.gmail.com>
Date: Tue, 11 Nov 2025 00:04:09 +0100
From: Linus Walleij <linus.walleij@...aro.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>, 
	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 v3 02/16] dt-bindings: battery: Clarify trickle-charge

On Wed, Nov 5, 2025 at 8:36 AM Matti Vaittinen
<matti.vaittinen@...ux.dev> wrote:

> From: Matti Vaittinen <mazziesaccount@...il.com>
>
> The term 'trickle-charging' is used to describe a very slow charging
> phase, where electrons "trickle-in" the battery.
>
> There are two different use-cases for this type of charging. At least
> some Li-Ion batteries can benefit from very slow, constant current,
> pre-pre phase 'trickle-charging', if a battery is very empty.
>
> Some other batteries use top-off phase 'trickle-charging', which is
> different from the above case.
>
> The battery bindings use the term 'trickle-charge' without specifying
> which of the use-cases properties are addressing. This has already
> caused some confusion.
>
> Clarify that the 'trickle-charge-current-microamp' refers to the first
> one, the "pre-pre" -charging use-case.
>
> Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij