linux-kernel - Re: [PATCH v2 2/2] power: supply: gpio-charger: add support for fast-charge timer

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Message-ID: <20260204124416.GA3066@legfed1>
Date: Wed, 4 Feb 2026 13:44:16 +0100
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: dimitri.fedrau@...bherr.com, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] power: supply: gpio-charger: add support for
 fast-charge timer

Am Fri, Jan 30, 2026 at 11:19:44PM +0100 schrieb Sebastian Reichel:
> Hi,
> 
> On Fri, Jan 09, 2026 at 07:41:20PM +0100, Dimitri Fedrau via B4 Relay wrote:
> > From: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > 
> > On some devices like TIs BQ24081 battery charger it is possible to activate
> > or deactivate a fast-charge timer that provides a backup safety for charge
> > termination. In case of the BQ24081 it is a fixed 7-hour timer. Add support
> > for enabling/disabling the fast-charge timer via GPIO.
> > 
> > Signed-off-by: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > ---
> 
> The documentation is missing _a lot of information_. What happens
> when the fast-charge timer is disabled? What happens when it is
> enabled and times out? What do you expect users to do with this
> control knob?
>

Yes, you are right. Will add the missing information for the BQ24081.
When the timer is enabled and 7-hours are passed the device will enter
state "Timer fault" where charging is disabled and cannot be enabled
without powering the device down and up again.

Disabling the timer will just deactive the mechanism above but charging
is not affected by it.

It's just a safety feature that can be turned on/off.

Will add this information, am I missing anything else ?

Best regards,
Dimitri Fedrau

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