From nobody Sun Feb 8 18:09:16 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 17F7627462; Wed, 22 Oct 2025 19:47:53 +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=1761162474; cv=none; b=YXiQCsEcKT1AtG1uslFXzdx1kpQJZSo3hUKU3oE4Ez3+4rcAyFPBy5dV6I/o21fPH5tiCGJawANu6lSCjfQF5EbF1U/Qrd7JpRqDCHZ1W4MBFQ+MhtJs8xvj91mvfztVn5js8UZoCDclmy8SNw5geA1H1L21DeG//e76xzVFg/Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761162474; c=relaxed/simple; bh=xQ+BUaYA9+sDnux4cMTAPJKVbRgpy1rp0kViDSJoH8s=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=nb5dyLNWebvABFzEOyYKeNGaxfg9vcwWGsil8t98qFKUE4+dAmAI/sdJQDTlij5/4FW2IxnabhyXXNmT+YVSkXR7JgaJxCshEkaFzqUMq+WiJOQKKiporEiW2rHM0OvSJFLezPfMJEqwIMNIoHJKWtH/eaou8VbKx+iBGBdO1/4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=K7c1txuq; 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="K7c1txuq" Received: by smtp.kernel.org (Postfix) with ESMTPS id 9F5B6C4CEE7; Wed, 22 Oct 2025 19:47:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761162473; bh=xQ+BUaYA9+sDnux4cMTAPJKVbRgpy1rp0kViDSJoH8s=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=K7c1txuqtbkR1DnEtuYETX6ACY9vTrTWm2YK8IpicehjnG9TSkhWwZoyP194FCRL2 YraqTo3X5fOFqIkpVSJeIP2xY+8gqn81YFBJ2pYWufMEmsIVzFrf91340J6GuXR8Nx y0rY+n/oQInJCCkTzV5CQjmSypmkBia7DLl+679k5UA4fiD2aXwgmS1m2l77pd36T2 vRwirkzLJJwPKbmaL2H1F+KhGKj/Y/+XwoQCSvzbsfz9G+pVykvU7LGfgC7zIEF7mP RXtjrkIpUISDW2D6cqTtsyUk2RnGDPpA4QaIuNIWHPCoualj3nSwmaVzy0jsjY/DF9 Rs6hls4GQ1n1Q== 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 8E1B3CCD1AB; Wed, 22 Oct 2025 19:47:53 +0000 (UTC) From: Dimitri Fedrau via B4 Relay Date: Wed, 22 Oct 2025 21:47:47 +0200 Subject: [PATCH 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: <20251022-gpio-charger-timer-v1-1-b557409400f2@liebherr.com> References: <20251022-gpio-charger-timer-v1-0-b557409400f2@liebherr.com> In-Reply-To: <20251022-gpio-charger-timer-v1-0-b557409400f2@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 X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1761162472; l=1423; i=dimitri.fedrau@liebherr.com; s=20241202; h=from:subject:message-id; bh=ajr1Bhnew2d+8SEwahiJrcr8lGScQzBku79JG1XD9nE=; b=EbKil6gHNtCPvQq7QlU/s/o4Q/ljGbZTtEI51tMdUowtCJReRu89E9V2OiOkZWmaR+01fU767 fTQj21i8v7gCBIhSQBI0kC/yzJE8aQ3bGQRSfr2vMEWCTeEZU5i2FKn 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. Signed-off-by: Dimitri Fedrau Acked-by: Conor Dooley --- 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 18:09:16 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 17FDE229B38; Wed, 22 Oct 2025 19:47:53 +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=1761162474; cv=none; b=EqRtR4eIDNe0c5PGabhB4xtQTWxa/KZQCEhHfoWdistKLP1576c+19epJ3HEi4GUnsOVkJhC8q+ds8VPQ2cl1slVy1oh0lU+h9HP77DnFOQEIvKo/QFuwdYClh6Y2ji4BBecCVgu9fBu/sv427RSBHU4ZL/0VU0kNWo9Mbl0EXc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761162474; 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=fsQMTMyyc5B/d7Ho52KC6LKbDGMik33QJKy8MT7jH7TxtPjRhz/xTkro8LphHUDYS3QnA+tNvn1fsDAH90K6XAxOIjzgsw2ppI33ETceXXYPP8mDvvoVvq2ptWLki+0jO/iwdzTqO1nohhNFjuTPXUcn+DUnqM4Uh6fQv5vKnvc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UB9v311P; 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="UB9v311P" Received: by smtp.kernel.org (Postfix) with ESMTPS id B069AC4CEFD; Wed, 22 Oct 2025 19:47:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761162473; bh=TMB/vzDd+LTd/lCIfQUrdA02dtsXU52MRguMhkvQVb8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=UB9v311PtmZ8PnnRfw/io6cgniNpJxDv/YprnnB2BwtlwPXX3TlMCSrxDSamfR6cw YCTqkEdYHuBOLVqQtB+YO0DSIm3uOrLH2iJSx4nz+1rNgfrjWtr81Opa0HD/c/ZMXk rH2GJm+MctyBJfVvyhoveOUH1/GPI3EoKn9k28XvejSAtOt6UEV8olKyTH4vh1Vmlf QQqF7codQelr3AK17hZSXNCnqFHGfRZhKZ9vXHX6fLYweFr7hHVnfGxRi6gQ+cokgK 4lDdznv1b76jNvwuJvyFtqo8Oli6bVO6/hKTvi3xJZUNM6COT7IE/smAirZWsOhNyh vRLmKhVbc1pYA== 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 9EB25CCF9E2; Wed, 22 Oct 2025 19:47:53 +0000 (UTC) From: Dimitri Fedrau via B4 Relay Date: Wed, 22 Oct 2025 21:47:48 +0200 Subject: [PATCH 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: <20251022-gpio-charger-timer-v1-2-b557409400f2@liebherr.com> References: <20251022-gpio-charger-timer-v1-0-b557409400f2@liebherr.com> In-Reply-To: <20251022-gpio-charger-timer-v1-0-b557409400f2@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 X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1761162472; l=3484; i=dimitri.fedrau@liebherr.com; s=20241202; h=from:subject:message-id; bh=p7cAOt/Kei0dwrov23S0iQygvZlwNI2XjIcLZTRyKRk=; b=VtUneGRFdgJjNlcSNgZ3ZTbrQI719MPCVYdI2APLJ8I8sP9jzrOg30kIpZiu5jYAmtRfXtPLt 1F5WZKPNtyvDaVCKeZ3PDOUlT7XZqb98OCgrPpXizmH/QaQUuC1hfC1 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