linux-kernel - [PATCH v3 03/16] dt-bindings: battery: Add trickle-charge upper limit

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Message-ID: <1babb4f8e9a1d21daab737e3427005852ec304fb.1762327887.git.mazziesaccount@gmail.com>
Date: Wed, 5 Nov 2025 09:36:31 +0200
From: Matti Vaittinen <matti.vaittinen@...ux.dev>
To: Matti Vaittinen <mazziesaccount@...il.com>,
	Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: 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>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	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: [PATCH v3 03/16] dt-bindings: battery: Add trickle-charge upper limit

From: Matti Vaittinen <mazziesaccount@...il.com>

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

---
Revision history:
 v2 => v3:
 - Clarify the 'trickle-charging' the property refers to is the
   "pre-pre" -phase charging.
 RFCv1 => v2:
 - No changes
---
 Documentation/devicetree/bindings/power/supply/battery.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/supply/battery.yaml b/Documentation/devicetree/bindings/power/supply/battery.yaml
index bfb7b716ae13..d1a2080557a0 100644
--- a/Documentation/devicetree/bindings/power/supply/battery.yaml
+++ b/Documentation/devicetree/bindings/power/supply/battery.yaml
@@ -71,6 +71,10 @@ properties:
       NiMh bq24400) - that is different and not controlled by this
       property.
 
+  tricklecharge-upper-limit-microvolt:
+    description: limit when to change to precharge from trickle charge
+      Trickle-charging here refers "wake-up" or "pre-pre" -charging.
+
   precharge-current-microamp:
     description: current for pre-charge phase
 
-- 
2.51.0


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