Some of the chargers for lithium-ion batteries use a trickle-charging as
a first charging phase for very empty batteries, to "wake-up" the battery.
Trickle-charging is a low current, constant current phase. After the
voltage of the very empty battery has reached an upper limit for
trickle charging, the pre-charge phase is started with a higher current.

Allow defining the upper limit for trickle charging voltage, after which
the charging should be changed to the pre-charging.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
---
 Documentation/devicetree/bindings/power/supply/battery.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/supply/battery.yaml b/Documentation/devicetree/bindings/power/supply/battery.yaml
index 491488e7b970..66bed24b3dee 100644
--- a/Documentation/devicetree/bindings/power/supply/battery.yaml
+++ b/Documentation/devicetree/bindings/power/supply/battery.yaml
@@ -66,6 +66,9 @@ properties:
   trickle-charge-current-microamp:
     description: current for trickle-charge phase
 
+  tricklecharge-upper-limit-microvolt:
+    description: limit when to change to precharge from trickle charge
+
   precharge-current-microamp:
     description: current for pre-charge phase
 
-- 
2.51.0

On Tue, Oct 7, 2025 at 10:33 AM Matti Vaittinen
<mazziesaccount@gmail.com> wrote:

> Some of the chargers for lithium-ion batteries use a trickle-charging as
> a first charging phase for very empty batteries, to "wake-up" the battery.
> Trickle-charging is a low current, constant current phase. After the
> voltage of the very empty battery has reached an upper limit for
> trickle charging, the pre-charge phase is started with a higher current.
>
> Allow defining the upper limit for trickle charging voltage, after which
> the charging should be changed to the pre-charging.
>
> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>

This is good stuff.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij