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dt-bindings: battery: Clarify trickle-charge

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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@linaro.org>
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patch.msgid.link/e2794140343103245410c3301f8994e1babaeb96.1765804226.git.mazziesaccount@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Matti Vaittinen 2025-12-15 15:17:38 +02:00 committed by Lee Jones
parent 4d08b3634f
commit dc74d1107f
1 changed files with 6 additions and 1 deletions
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7
Documentation/devicetree/bindings/power/supply/battery.yaml
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@ -64,7 +64,12 @@ properties:
description: battery design capacity
trickle-charge-current-microamp:
description: current for trickle-charge phase
description: current for trickle-charge phase.
Please note that the trickle-charging here, refers "wake-up" or
"pre-pre" -charging, for very empty batteries. Similar term is also
used for "maintenance" or "top-off" -charging of batteries (like
NiMh bq24400) - that is different and not controlled by this
property.
precharge-current-microamp:
description: current for pre-charge phase