From nobody Mon Mar 23 19:52:29 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 E0CE93BE626; Mon, 23 Mar 2026 16:04:16 +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=1774281857; cv=none; b=J+nEZnY5jCQGINerQLbbKUL7MYP6tEGOcr9MzmNM4aBWHYaderqnMSLEMp/XWklwgOAfHD2F163BLO3z6sNkigJzrS2ePKkxNZAu1huqnVKxY3+2KltLIezcrOQ/LF8BCKATgLy14AplXFBZp4nv8qmzYiipia4YOLwfkYlIkEs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774281857; c=relaxed/simple; bh=VHMopsrG6Xi22dXMAyiAPvlaIWJqNW9MggRaSuIfstI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=cg8/HWQnnw8G6PfioTc70PNcSLu3xVRmb0JH6RCerve0/hVR5VlOrJmv/KgdISCIjLQ5WqFk5/IKsIZGM5xzwBCM7eHxmWtcKOyLiwq95luTPzkGhnTPK89K4Mvloy3ntB7NpmWgnHvf7krtQtv9Z7GGNO845Zkz4IZQ5YqNm5c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KrF8fe1X; 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="KrF8fe1X" Received: by smtp.kernel.org (Postfix) with ESMTPS id 877DEC2BCB4; Mon, 23 Mar 2026 16:04:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774281856; bh=VHMopsrG6Xi22dXMAyiAPvlaIWJqNW9MggRaSuIfstI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=KrF8fe1XsxH7ARV7e521gkWrr1ji9P12SsvtABaLHNEN3Wf4AZjCQHRyh+5xdsuIl 31M2XmXgZGn2bZVVAekdjdtEF2H6Jacn40HS0MUbf3eNNQUblWPrNvS/kZwfRNTheL bpX6rlLMtN0MNvHj+/A7LbGml+MIyzEbyroD64QhU2KIbVxqnbdW1iR2/KGQbPjQhL xxK/PW1Gs06xcFT4N9MjkNV/NAhEDXr8fKG1INTN42hBWaLwbdNYj4B65foidd2wqo d7b6uOAQlHjz2MyeNFXQRnZJq3oW8Lyr4wwgkex+fWa5FvHmvMFtb+7EVUV0cz5Gdv HXh9DaWdbfygw== 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 6D5D5F483C1; Mon, 23 Mar 2026 16:04:16 +0000 (UTC) From: Dimitri Fedrau via B4 Relay Date: Mon, 23 Mar 2026 17:04:06 +0100 Subject: [PATCH v3 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: <20260323-gpio-charger-timer-v3-1-885796d681a5@liebherr.com> References: <20260323-gpio-charger-timer-v3-0-885796d681a5@liebherr.com> In-Reply-To: <20260323-gpio-charger-timer-v3-0-885796d681a5@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=1774281855; l=1976; i=dimitri.fedrau@liebherr.com; s=20241202; h=from:subject:message-id; bh=qVR6Vlf2NNZxUIBX8M/euAC/Z+4KL1Wd23n+lTvvOvU=; b=qRmAOLjR6UzvKW8cPZJQ3T9OJVvl50z8wxEwmvMLqS2Dra+xb0jUNQ24eg3yq4GfoOvy9EuaO cTTFvIKcLkPB1A0Kp3mTsggf0o+4pM3FwQz8WGQ2qhpA1MEOXC22u8g 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 --- .../bindings/power/supply/gpio-charger.yaml | 22 ++++++++++++++++++= +++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/power/supply/gpio-charger.ya= ml b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml index 25826bfc289c1c00c338fd0cee2ae6932529cfc3..fefa09cb24ec2f501099f486c9a= 4eb77e64cda67 100644 --- a/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml +++ b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml @@ -16,7 +16,12 @@ description: =20 properties: compatible: - const: gpio-charger + oneOf: + - const: gpio-charger + - items: + - enum: + - ti,bq24081 + - const: gpio-charger =20 charger-type: enum: @@ -62,6 +67,10 @@ 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 @@ -98,3 +107,14 @@ examples: <0 0x02>; // 0 mA =3D> GPIO A.11 high charge-current-limit-default-microamp =3D <700000>; }; + - | + #include + + charger { + compatible =3D "ti,bq24081", "gpio-charger"; + charger-type =3D "battery"; + charge-status-gpios =3D <&gpio1 4 GPIO_ACTIVE_LOW>; + charge-current-limit-gpios =3D <&gpio1 3 GPIO_ACTIVE_LOW>; + charge-current-limit-mapping =3D <206000 0x1>, <0 0x0>; + fast-charge-timer-gpios =3D <&gpio1 6 GPIO_ACTIVE_LOW>; + }; --=20 2.39.5 From nobody Mon Mar 23 19:52:29 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 E33FA3BE62A; Mon, 23 Mar 2026 16:04:16 +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=1774281857; cv=none; b=kmyJCSQn6hQKp2bku5lAjAofF8QK9roygFVjGE1NbI3Com1II5ZO0hF3kZ9k2uGjUs8atYhhwRCkkYDMpMzr6wu8CYcIKAG/YYSvA02ppiwhhLfSt9Ch2g/7JZeg0yMAP66N+ytBf6+ZVkJySqw9Inm0KThgJTlALwB8xNOq5xU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774281857; c=relaxed/simple; bh=DXyUYdfAms0oBEZCl+nVQo4RMJB3PO2qlaqMDTHS4w0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=WH8x9FoHGwi13eao6Lvp2ETlQcgYG4+R8Ks+uCShDAtlhtxv8YUvZmk0Z0JW+4YI916jACYZMLUKyXpE2hUUpeB35dfHLAYhyv0rSMdiN+STnyQhGKgtG5E6kYHlLefy9kFTGMXaro1GKt5C/YikErl/dPvCrcG0buA0aZvwbxU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Cet5woGL; 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="Cet5woGL" Received: by smtp.kernel.org (Postfix) with ESMTPS id 915D3C2BCB5; Mon, 23 Mar 2026 16:04:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774281856; bh=DXyUYdfAms0oBEZCl+nVQo4RMJB3PO2qlaqMDTHS4w0=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=Cet5woGL+COUNIrZkIAzOuyR9nVEGlgBvsbHnJTR0KZWYjQVR4co6p54o/j8gaLln lWl3RFnQUWyM3YnrkypPoYSArfwJJffsoZgYWmWBT4MbnJ5LYszJz1m8QZw+hhVMju DyZw50OCXSwAClbhecRaFX/sQs3Edlk2BWHMbXV1iGyNC+ps7HIuJtdSeTDyM6wd4c r1Whd4H2Dy8tnoPUQkc5zUlOv8fcEmfwa4fyB2iFFq1SMXjkIf7iwNpnRNUDtwoGiq PbssJ/InzVnG6bqKJEY5MYP5Hge9FL/44uKtfY4t4jpxa37/3J5jgh4j4YqCsTcRM5 +OekkgWN7tw0w== 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 83E21F483C3; Mon, 23 Mar 2026 16:04:16 +0000 (UTC) From: Dimitri Fedrau via B4 Relay Date: Mon, 23 Mar 2026 17:04:07 +0100 Subject: [PATCH v3 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: <20260323-gpio-charger-timer-v3-2-885796d681a5@liebherr.com> References: <20260323-gpio-charger-timer-v3-0-885796d681a5@liebherr.com> In-Reply-To: <20260323-gpio-charger-timer-v3-0-885796d681a5@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=1774281855; l=5009; i=dimitri.fedrau@liebherr.com; s=20241202; h=from:subject:message-id; bh=sgtWDyyuZOzl/ITkNr7NiW/b4yVbW9a70XFWcPAqKSc=; b=khD+6O5ZJXoDwSEK8kj9wRmS78UwMjnhg11By7S+c8YAjiZAWVzqQXBFviSKR3N9XtCjAsfXk Wz3DIG5x82+BP0chcR1TF47YU3QgPrVanpCXqGpgg3lYJ8kjWsVMJlY 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 | 14 ++++++ drivers/power/supply/gpio-charger.c | 56 ++++++++++++++++++= +++- 2 files changed, 69 insertions(+), 1 deletion(-) 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..4a14d1d1bee3b96b6c77865e693= c892d9bc3e5d6 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-power-gpio-charger @@ -0,0 +1,14 @@ +What: /sys/class/power_supply//fast_charge_timer +Date: March 2026 +KernelVersion: 7.1.0 +Contact: Dimitri Fedrau +Description: + This entry enables or disables the timer in fast-charge mode. + When enabled the timer is started with a fixed timeout. After + timing out, charging is disabled. This provides a backup safety + for charge termination. Disabling the timer doesn't have any + impact on charge termination. + + 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..8b67118be38ffd974a67f8bee3b= 47973903196c5 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; @@ -39,6 +40,18 @@ struct gpio_charger { u32 charge_current_limit; }; =20 +struct gpio_charger_data { + bool has_fast_charge_timer; +}; + +static const struct gpio_charger_data gpio_charger_data =3D { + .has_fast_charge_timer =3D false, +}; + +static const struct gpio_charger_data bq24081_data =3D { + .has_fast_charge_timer =3D true, +}; + static irqreturn_t gpio_charger_irq(int irq, void *devid) { struct power_supply *charger =3D devid; @@ -259,6 +272,36 @@ 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 @@ -274,6 +317,7 @@ static int gpio_charger_probe(struct platform_device *p= dev) { struct device *dev =3D &pdev->dev; const struct gpio_charger_platform_data *pdata =3D dev->platform_data; + const struct gpio_charger_data *data =3D device_get_match_data(dev); struct power_supply_config psy_cfg =3D {}; struct gpio_charger *gpio_charger; struct power_supply_desc *charger_desc; @@ -308,6 +352,13 @@ 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 +387,8 @@ 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; + if (data->has_fast_charge_timer) + psy_cfg.attr_grp =3D gpio_charger_groups; =20 if (pdata) { charger_desc->name =3D pdata->name; @@ -402,7 +455,8 @@ static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, gpio_charger_suspend, gpio_charger_resume); =20 static const struct of_device_id gpio_charger_match[] =3D { - { .compatible =3D "gpio-charger" }, + { .compatible =3D "gpio-charger", .data =3D &gpio_charger_data, }, + { .compatible =3D "ti,bq24081", .data =3D &bq24081_data, }, { } }; MODULE_DEVICE_TABLE(of, gpio_charger_match); --=20 2.39.5