[PATCH 0/2] power: supply: gpio-charger: add support for fast-charge timer

[PATCH 0/2] power: supply: gpio-charger: add support for fast-charge timer

[Dimitri Fedrau via B4 Relay]

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@liebherr.com>
---
Dimitri Fedrau (2):
      dt-bindings: power: supply: gpio-charger: add support for fast-charge timer
      power: supply: gpio-charger: add support for fast-charge timer

 .../ABI/testing/sysfs-class-power-gpio-charger     | 10 ++++++
 .../bindings/power/supply/gpio-charger.yaml        |  5 +++
 drivers/power/supply/gpio-charger.c                | 39 ++++++++++++++++++++++
 3 files changed, 54 insertions(+)
---
base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
change-id: 20251022-gpio-charger-timer-cddae1619714

Best regards,
-- 
Dimitri Fedrau <dimitri.fedrau@liebherr.com>

[PATCH 1/2] dt-bindings: power: supply: gpio-charger: add support for fast-charge timer

[Dimitri Fedrau via B4 Relay]

From: Dimitri Fedrau <dimitri.fedrau@liebherr.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 via GPIO. In case of the BQ24081 it is a fixed 7-hour timer.

Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
---
 Documentation/devicetree/bindings/power/supply/gpio-charger.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
index 25826bfc289c1c00c338fd0cee2ae6932529cfc3..0edacc104186497118d4ba41f80947009a9aacf6 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.
 
+  fast-charge-timer-gpios:
+    maxItems: 1
+    description: GPIO used for enabling/disabling the fast-charge timer
+
 required:
   - compatible
 
@@ -97,4 +101,5 @@ examples:
                                      <700000 0x01>, // 700 mA => GPIO A.12 high
                                      <0 0x02>; // 0 mA => GPIO A.11 high
       charge-current-limit-default-microamp = <700000>;
+      fast-charge-timer-gpios = <&gpioA 13 GPIO_ACTIVE_LOW>;
     };

-- 
2.39.5

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

[Dimitri Fedrau via B4 Relay]

From: Dimitri Fedrau <dimitri.fedrau@liebherr.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@liebherr.com>
---
 .../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/Documentation/ABI/testing/sysfs-class-power-gpio-charger
new file mode 100644
index 0000000000000000000000000000000000000000..95fb31ac4af3d5354bdc642c98baa7df267d150d
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-power-gpio-charger
@@ -0,0 +1,10 @@
+What:		/sys/class/power_supply/<supply_name>/fast_charge_timer
+Date:		October 2025
+KernelVersion:	6.19.0
+Contact:	Dimitri Fedrau <dimitri.fedrau@liebherr.com>
+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/gpio-charger.c
index 2504190eba82e69b79382320e67de6b8f3dedc77..52997205879406fae600171b070a0328657fa79b 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;
 
 	struct gpio_descs *current_limit_gpios;
 	struct gpio_mapping *current_limit_map;
@@ -259,6 +260,36 @@ static int init_charge_current_limit(struct device *dev,
 	return 0;
 }
 
+static ssize_t fast_charge_timer_store(struct device *dev,
+				       struct device_attribute *attr,
+				       const char *buf, size_t count)
+{
+	struct power_supply *psy = dev_get_drvdata(dev);
+	struct gpio_charger *gpio_charger = power_supply_get_drvdata(psy);
+	int ret;
+	bool en;
+
+	if (kstrtobool(buf, &en))
+		return -EINVAL;
+
+	if (!gpio_charger->timer)
+		return -ENODEV;
+
+	ret = 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[] = {
+	&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++;
 	}
 
+	gpio_charger->timer = 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 = 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 *pdev)
 
 	psy_cfg.fwnode = dev_fwnode(dev);
 	psy_cfg.drv_data = gpio_charger;
+	psy_cfg.attr_grp = gpio_charger_groups;
 
 	if (pdata) {
 		charger_desc->name = pdata->name;

-- 
2.39.5

Re: [PATCH 1/2] dt-bindings: power: supply: gpio-charger: add support for fast-charge timer

[Conor Dooley]

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On Wed, Oct 22, 2025 at 09:47:47PM +0200, Dimitri Fedrau via B4 Relay wrote:
> From: Dimitri Fedrau <dimitri.fedrau@liebherr.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 via GPIO. In case of the BQ24081 it is a fixed 7-hour timer.
> 
> Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>

Acked-by: Conor Dooley <conor.dooley@microchip.com>
pw-bot: not-applicable

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Re: [PATCH 0/2] power: supply: gpio-charger: add support for fast-charge timer

[Dimitri Fedrau]

Hi Sebastian,

gentle ping, is there a chance for you reviewing the series ?

Best regards,
Dimitri Fedrau

Am Wed, Oct 22, 2025 at 09:47:46PM +0200 schrieb Dimitri Fedrau via B4 Relay:
> 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@liebherr.com>
> ---
> Dimitri Fedrau (2):
>       dt-bindings: power: supply: gpio-charger: add support for fast-charge timer
>       power: supply: gpio-charger: add support for fast-charge timer
> 
>  .../ABI/testing/sysfs-class-power-gpio-charger     | 10 ++++++
>  .../bindings/power/supply/gpio-charger.yaml        |  5 +++
>  drivers/power/supply/gpio-charger.c                | 39 ++++++++++++++++++++++
>  3 files changed, 54 insertions(+)
> ---
> base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
> change-id: 20251022-gpio-charger-timer-cddae1619714
> 
> Best regards,
> -- 
> Dimitri Fedrau <dimitri.fedrau@liebherr.com>
> 
>