linux-kernel - Re: [PATCH v2 02/15] dt-bindings: Add trickle-charge upper limit

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Message-ID: <CACRpkdZcszMZEU2Wzx8kaoR46ytziqtedmCrsjEL3QOrDtDgzg@mail.gmail.com>
Date: Wed, 29 Oct 2025 14:26:08 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Matti Vaittinen <mazziesaccount@...il.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, 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>, Andreas Kemnade <andreas@...nade.info>, 
	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
Subject: Re: [PATCH v2 02/15] dt-bindings: Add trickle-charge upper limit

On Wed, Oct 29, 2025 at 7:22 AM Matti Vaittinen
<mazziesaccount@...il.com> wrote:

> > But I believe this is wrong. Trickle charging does not switch to
> > anything more, there is no fast charging after trickle. You have some
> > sort of pre-pre-charging, which is just pre-charging.
>
> There is trickle, pre and fast-charge phases. Furthermore, the
> fast-charge is further divided to CC and CV. Finally, if my memory
> serves me well, Linus W did explain me that some chargers use
> 'trickle-charging' as a _last_ charging phase for a full battery. Thus
> the term 'trickle-charging' is slightly confusing - but it is already
> used by the existing bindings...
>
> https://lore.kernel.org/all/20211116001755.2132036-1-linus.walleij@linaro.org/

I think we need to refer to a textbook or IEEE articles to get this
terminology right.

As you say it appears "trickle-charging" is ambiguous.

Maybe what Krzysztof suggest to use: "pre-pre-charging" or
"empty-battery-charging" or something like this is needed.

But we really need a trustworthy academic source here.

Yours,
Linus Walleij