From nobody Sun Feb 8 05:29:01 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 97252242D97; Fri, 9 Jan 2026 18:41:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767984086; cv=none; b=i1pR/s8frAd0oWiQUx0E+zWVQVNM7ch9+gFxa4WYYGQAHhEO8li2/s9qS57Le9M+GF4NjQ4ujyw3NwZvWS8nRzUwbajBSI7RELdJojKx0EDqUUw6osUUhEXXwthk3EDFgGabMV2RYuy/eYAYsvX7uisiGEIha+iQxXYzdgsGDs4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767984086; c=relaxed/simple; bh=+JkkifTOJxSCpXoV2BVeXaPAEiFajo9VzT3RGBLCJoY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=L/C6v/dg6wu/o9cUNNkqza5vopK0LRWke/AJ9ssP8blsWugdA9E5KBiiasDa7whQOJUIFRVNlObdm61TTDvbqVVZELbTZ7Fn+tgPFfXLw4nNMUUHMMn8MZDEEg6j4fIJObYuIytQERqKmA87PewMjIDDhn4nG7UxKJDG/qXDBLI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Agf9BaFn; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Agf9BaFn" Received: by smtp.kernel.org (Postfix) with ESMTPS id 482D9C19422; Fri, 9 Jan 2026 18:41:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767984086; bh=+JkkifTOJxSCpXoV2BVeXaPAEiFajo9VzT3RGBLCJoY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=Agf9BaFnZXdcg0wPOSSvOJYxffw+1s65w6yAEnJOVJE0TpTzsILdDZYrgzFVBDGAc TH99YCZAym34MDC8E70HqZAzxe91vn+jkR2xJrxFWJJOGkZRg/PKfhGJ4/Uf+evCEt eLINhzw/EgYyU3Oj7Lj5yPfrcyhuG48SB286KGOsqVOnOGh54dQNxHUYnHJY/9Bbmd WZgqxcMG3LsUhaDmBLHx/HPEcnd+mJ1+RZ9tc9AR7wkDCNw0Z2JCmK/4ppL4tOM8tH Z+xXh3B0IBJVRZf88ZUaWumET/oaP8MQQv96+S4iZPujh2b/6UcmCpCfa38cq1j1GA zqbxkHWVykqJQ== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3409BD26D94; Fri, 9 Jan 2026 18:41:26 +0000 (UTC) From: Dimitri Fedrau via B4 Relay Date: Fri, 09 Jan 2026 19:41:19 +0100 Subject: [PATCH v2 1/2] dt-bindings: power: supply: gpio-charger: add support for fast-charge timer Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260109-gpio-charger-timer-v2-1-63fd1ba75830@liebherr.com> References: <20260109-gpio-charger-timer-v2-0-63fd1ba75830@liebherr.com> In-Reply-To: <20260109-gpio-charger-timer-v2-0-63fd1ba75830@liebherr.com> To: Sebastian Reichel , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Dimitri Fedrau , Dimitri Fedrau , Sebastian Reichel , Conor Dooley X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1767984085; l=1476; i=dimitri.fedrau@liebherr.com; s=20241202; h=from:subject:message-id; bh=iQZT3H4QbthJR7XgNMzV+OsM4tGWzdI0GFJQLgU7bk0=; b=h2gn5xZzegIl21uvYWmVePlzgBTuKD2naV0Sr/uFrdXzN4B+309QaSQ889ueNXPoAGKHAyiBO IfKjd3NpF0iBHEQpmw9dPofr0c/+BYec4aytaD4xHd7SmqmQaXOig4X X-Developer-Key: i=dimitri.fedrau@liebherr.com; a=ed25519; pk=rT653x09JSQvotxIqQl4/XiI4AOiBZrdOGvxDUbb5m8= X-Endpoint-Received: by B4 Relay for dimitri.fedrau@liebherr.com/20241202 with auth_id=290 X-Original-From: Dimitri Fedrau Reply-To: dimitri.fedrau@liebherr.com From: Dimitri Fedrau 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 via GPIO. In case of the BQ24081 it is a fixed 7-hour timer. Acked-by: Conor Dooley Signed-off-by: Dimitri Fedrau --- Documentation/devicetree/bindings/power/supply/gpio-charger.yaml | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/power/supply/gpio-charger.ya= ml b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml index 25826bfc289c1c00c338fd0cee2ae6932529cfc3..0edacc104186497118d4ba41f80= 947009a9aacf6 100644 --- a/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml +++ b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml @@ -62,6 +62,10 @@ properties: description: Default charge current limit. Must be listed in charge-current-limit-mapping. =20 + fast-charge-timer-gpios: + maxItems: 1 + description: GPIO used for enabling/disabling the fast-charge timer + required: - compatible =20 @@ -97,4 +101,5 @@ examples: <700000 0x01>, // 700 mA =3D> GPIO A.= 12 high <0 0x02>; // 0 mA =3D> GPIO A.11 high charge-current-limit-default-microamp =3D <700000>; + fast-charge-timer-gpios =3D <&gpioA 13 GPIO_ACTIVE_LOW>; }; --=20 2.39.5 From nobody Sun Feb 8 05:29:01 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9738E28F935; Fri, 9 Jan 2026 18:41:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767984086; cv=none; b=HqoOJs6x21PjO95g7g5lfzMaTEd9hE0hE3QYmbd7D4+k96IeFFVa3O8kX7CidSI3hYqG8sk/daViNgJTjozgIggJBkGUZFUx6p3MXs25PthFXQpALOPbSUcFn8PQJDL8tjHDyQM5qeZ8SmkiV8onTuNzKGMZESI5s2sNKf4sqNk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767984086; c=relaxed/simple; bh=TMB/vzDd+LTd/lCIfQUrdA02dtsXU52MRguMhkvQVb8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ak9YqAIf15d/JRE6Zu1GtDCTHhqcZNSU6/dNY6o7crmNJOJ8alNKQyVuFccXH9xCl0wP+eY8kx9+FC7Ne+6AI7QkPhmZzXlMZwuPFw9CZ0S+pBc9e9JY2AjY9Kr7zjCOMDWDeLHAD3n/H88ame8NSeEKR++FOysWWsJwXmSJu8A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=O3536UNx; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="O3536UNx" Received: by smtp.kernel.org (Postfix) with ESMTPS id 56FE6C4CEF7; Fri, 9 Jan 2026 18:41:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767984086; bh=TMB/vzDd+LTd/lCIfQUrdA02dtsXU52MRguMhkvQVb8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=O3536UNxnd1jjpFdd1Htt0zkUCAlkHsuPGkYMCD1qVhlgwFyT6IevgaH77FMF1NlD DNRVU+u2IFH3jmlSV9jtQLVvOGUYLjFAeJvUc3yMchv08jCdLnJoJU5m/jESIHhDEz 6V3EZ/5t0wIFqgHS89KgR/86iuvT3UYfzJJepVxfngGFTzuDPBZHW9BTaDyJHxThGo bx2a4ySRxO+5vCHZJ2+qwXnQIsMJxnia9awMruMrArP6xTp4eptnRC1tbWrqdGGlWx sjQ1zBB/CMOWHSA9li+0VnBdOytYwGHtt/z1JlD6CWBDFQf3YafYjKHkMVVohPNnKq fPTapFwSAOMcg== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41C97D26D97; Fri, 9 Jan 2026 18:41:26 +0000 (UTC) From: Dimitri Fedrau via B4 Relay Date: Fri, 09 Jan 2026 19:41:20 +0100 Subject: [PATCH v2 2/2] power: supply: gpio-charger: add support for fast-charge timer Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260109-gpio-charger-timer-v2-2-63fd1ba75830@liebherr.com> References: <20260109-gpio-charger-timer-v2-0-63fd1ba75830@liebherr.com> In-Reply-To: <20260109-gpio-charger-timer-v2-0-63fd1ba75830@liebherr.com> To: Sebastian Reichel , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Dimitri Fedrau , Dimitri Fedrau , Sebastian Reichel X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1767984085; l=3484; i=dimitri.fedrau@liebherr.com; s=20241202; h=from:subject:message-id; bh=p7cAOt/Kei0dwrov23S0iQygvZlwNI2XjIcLZTRyKRk=; b=6dESZ3MWxnkh4h/fOAmaWDg0coGjFZxphczIfrWb1oJXbFV2NLon2cmhGbrnCYdc++rrW/cMm 9aXezOzC+hcBE82MF6bAuasro2NdqeqET3K2J9dlGSEuU4tkR93PKLC X-Developer-Key: i=dimitri.fedrau@liebherr.com; a=ed25519; pk=rT653x09JSQvotxIqQl4/XiI4AOiBZrdOGvxDUbb5m8= X-Endpoint-Received: by B4 Relay for dimitri.fedrau@liebherr.com/20241202 with auth_id=290 X-Original-From: Dimitri Fedrau Reply-To: dimitri.fedrau@liebherr.com From: Dimitri Fedrau 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 --- .../ABI/testing/sysfs-class-power-gpio-charger | 10 ++++++ drivers/power/supply/gpio-charger.c | 39 ++++++++++++++++++= ++++ 2 files changed, 49 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-power-gpio-charger b/Doc= umentation/ABI/testing/sysfs-class-power-gpio-charger new file mode 100644 index 0000000000000000000000000000000000000000..95fb31ac4af3d5354bdc642c98b= aa7df267d150d --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-power-gpio-charger @@ -0,0 +1,10 @@ +What: /sys/class/power_supply//fast_charge_timer +Date: October 2025 +KernelVersion: 6.19.0 +Contact: Dimitri Fedrau +Description: + This entry enables or disables the timer in fast-charge mode. + + Access: Write + + Valid values: 0 (disabled) or 1 (enabled) diff --git a/drivers/power/supply/gpio-charger.c b/drivers/power/supply/gpi= o-charger.c index 2504190eba82e69b79382320e67de6b8f3dedc77..52997205879406fae600171b070= a0328657fa79b 100644 --- a/drivers/power/supply/gpio-charger.c +++ b/drivers/power/supply/gpio-charger.c @@ -32,6 +32,7 @@ struct gpio_charger { struct power_supply_desc charger_desc; struct gpio_desc *gpiod; struct gpio_desc *charge_status; + struct gpio_desc *timer; =20 struct gpio_descs *current_limit_gpios; struct gpio_mapping *current_limit_map; @@ -259,6 +260,36 @@ static int init_charge_current_limit(struct device *de= v, return 0; } =20 +static ssize_t fast_charge_timer_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct power_supply *psy =3D dev_get_drvdata(dev); + struct gpio_charger *gpio_charger =3D power_supply_get_drvdata(psy); + int ret; + bool en; + + if (kstrtobool(buf, &en)) + return -EINVAL; + + if (!gpio_charger->timer) + return -ENODEV; + + ret =3D gpiod_set_value_cansleep(gpio_charger->timer, en); + if (ret) + return ret; + + return count; +} + +static DEVICE_ATTR_WO(fast_charge_timer); + +static struct attribute *gpio_charger_attrs[] =3D { + &dev_attr_fast_charge_timer.attr, + NULL +}; +ATTRIBUTE_GROUPS(gpio_charger); + /* * The entries will be overwritten by driver's probe routine depending * on the available features. This list ensures, that the array is big @@ -308,6 +339,13 @@ static int gpio_charger_probe(struct platform_device *= pdev) num_props++; } =20 + gpio_charger->timer =3D devm_gpiod_get_optional(dev, "fast-charge-timer", + GPIOD_OUT_HIGH); + if (IS_ERR(gpio_charger->timer)) { + return dev_err_probe(dev, PTR_ERR(gpio_charger->timer), + "error getting fast-charge timer GPIO descriptor\n"); + } + charge_status =3D devm_gpiod_get_optional(dev, "charge-status", GPIOD_IN); if (IS_ERR(charge_status)) return PTR_ERR(charge_status); @@ -336,6 +374,7 @@ static int gpio_charger_probe(struct platform_device *p= dev) =20 psy_cfg.fwnode =3D dev_fwnode(dev); psy_cfg.drv_data =3D gpio_charger; + psy_cfg.attr_grp =3D gpio_charger_groups; =20 if (pdata) { charger_desc->name =3D pdata->name; --=20 2.39.5