Merge tag 'for-v6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply

Pull power supply and reset updates from Sebastian Reichel:
 "Power-supply core:
   - introduce adc-battery-helper for capacity estimation based on
     simple ADC readings of battery voltage and current
   - add new properties for battery internal resistance and state of
     health

  Power-supply drivers:
   - ug3105_battery: convert to adc-battery-helper
   - intel_dc_ti_battery: New driver for Intel Dollar Cove TI batteries
   - rt9467-charger: add voltage and current ADC support
   - sbs-charger: support multiple instances
   - qcom_battmgr:
       - add charge control support
       - add support for state of health and internal resistance
   - max77705_charger:
       - big driver cleanup
       - add support for setting charge current
   - misc minor fixes and cleanups"

* tag 'for-v6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply: (38 commits)
  power: supply: qcom_battmgr: handle charging state change notifications
  power: supply: max77705_charger: use REGMAP_IRQ_REG_LINE macro
  power: supply: max77705_charger: rework interrupts
  power: supply: max77705_charger: add writable properties
  power: supply: max77705_charger: return error when config fails
  power: supply: max77705_charger: use regfields for config registers
  power: supply: max77705_charger: refactoring: rename charger to chg
  mfd: max77705: max77705_charger: move active discharge setting to mfd parent
  power: supply: max77976_charger: fix constant current reporting
  power: supply: qcom_battmgr: Add charge control support
  dt-bindings: soc: qcom,pmic-glink: Add charge limit nvmem properties
  power: supply: qcom_battmgr: update compats for SM8550 and X1E80100
  power: supply: qcom_battmgr: Add state_of_health property
  power: supply: qcom_battmgr: Add resistance power supply property
  power: supply: core: Add state_of_health power supply property
  power: supply: core: Add resistance power supply property
  power: supply: rx51: remove redundant condition checks
  dt-bindings: power: supply: bq24190: document charge enable pin
  dt-bindings: power: supply: bq27xxx: document optional interrupt
  power: supply: intel_dc_ti_battery: Drop no longer relevant comment
  ...

Author: torvalds

Documentation/ABI/testing/sysfs-class-power

@@ -553,6 +553,43 @@ Description:
 			Integer > 0: representing full cycles
 			Integer = 0: cycle_count info is not available
 
+What:		/sys/class/power_supply/<supply_name>/internal_resistance
+Date:		August 2025
+Contact:	linux-arm-msm@vger.kernel.org
+Description:
+		Represent the battery's internal resistance, often referred
+		to as Equivalent Series Resistance (ESR). It is a dynamic
+		parameter that reflects the opposition to current flow within
+		the cell. It is not a fixed value but varies significantly
+		based on several operational conditions, including battery
+		state of charge (SoC), temperature, and whether the battery
+		is in a charging or discharging state.
+
+		Access: Read
+
+		Valid values: Represented in microohms
+
+What:		/sys/class/power_supply/<supply_name>/state_of_health
+Date:		August 2025
+Contact:	linux-arm-msm@vger.kernel.org
+Description:
+		The state_of_health parameter quantifies the overall condition
+		of a battery as a percentage, reflecting its ability to deliver
+		rated performance relative to its original specifications. It is
+		dynamically computed using a combination of learned capacity
+		and impedance-based degradation indicators, both of which evolve
+		over the battery's lifecycle.
+		Note that the exact algorithms are kept secret by most battery
+		vendors and the value from different battery vendors cannot be
+		compared with each other as there is no vendor-agnostic definition
+		of "performance". Also this usually cannot be used for any
+		calculations (i.e. this is not the factor between charge_full and
+		charge_full_design).
+
+		Access: Read
+
+		Valid values: 0 - 100 (percent)
+
 **USB Properties**
 
 What:		/sys/class/power_supply/<supply_name>/input_current_limit

Documentation/devicetree/bindings/power/supply/bq24190.yaml

@@ -30,6 +30,12 @@ properties:
   interrupts:
     maxItems: 1
 
+  ce-gpios:
+    description:
+      Active low Charge Enable pin. Battery charging is enabled when
+      REG01[5:4] = 01 and CE pin is Low. CE pin must be pulled high or low.
+    maxItems: 1
+
   usb-otg-vbus:
     $ref: /schemas/regulator/regulator.yaml#
     description: |

Documentation/devicetree/bindings/power/supply/bq27xxx.yaml

@@ -16,9 +16,6 @@ description: |
   Support various Texas Instruments fuel gauge devices that share similar
   register maps and power supply properties
 
-allOf:
-  - $ref: power-supply.yaml#
-
 properties:
   compatible:
     enum:
@@ -58,6 +55,10 @@ properties:
     maxItems: 1
     description: integer, I2C address of the fuel gauge.
 
+  interrupts:
+    maxItems: 1
+    description: the SOC_INT or GPOUT pin
+
   monitored-battery:
     description: |
        The fuel gauge uses the following battery properties:
@@ -68,6 +69,36 @@ properties:
 
   power-supplies: true
 
+allOf:
+  - $ref: power-supply.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - ti,bq27200
+              - ti,bq27210
+              - ti,bq27500 # deprecated, use revision specific property below
+              - ti,bq27510 # deprecated, use revision specific property below
+              - ti,bq27520 # deprecated, use revision specific property below
+              - ti,bq27500-1
+              - ti,bq27510g1
+              - ti,bq27510g2
+              - ti,bq27521
+              - ti,bq27541
+              - ti,bq27542
+              - ti,bq27546
+              - ti,bq27742
+              - ti,bq27545
+              - ti,bq27411
+              - ti,bq27z561
+              - ti,bq28z610
+              - ti,bq34z100
+              - ti,bq78z100
+    then:
+      properties:
+        interrupts: false
+
 required:
   - compatible
   - reg

Documentation/devicetree/bindings/soc/qcom/qcom,pmic-glink.yaml

@@ -56,6 +56,20 @@ properties:
       The array should contain a gpio entry for each PMIC Glink connector, in reg order.
       It is defined that GPIO active level means "CC2" or Reversed/Flipped orientation.
 
+  nvmem-cells:
+    minItems: 3
+    maxItems: 3
+    description:
+      The nvmem cells contain the charge control settings, including the charge control
+      enable status, the battery state of charge (SoC) threshold for stopping charging,
+      and the battery SoC delta required to restart charging.
+
+  nvmem-cell-names:
+    items:
+      - const: charge_limit_en
+      - const: charge_limit_end
+      - const: charge_limit_delta
+
 patternProperties:
   '^connector@\d$':
     $ref: /schemas/connector/usb-connector.yaml#

drivers/mfd/max77705.c

@@ -108,6 +108,9 @@ static int max77705_i2c_probe(struct i2c_client *i2c)
 	if (pmic_rev != MAX77705_PASS3)
 		return dev_err_probe(dev, -ENODEV, "Rev.0x%x is not tested\n", pmic_rev);
 
+	/* Active Discharge Enable */
+	regmap_update_bits(max77705->regmap, MAX77705_PMIC_REG_MAINCTRL1, 1, 1);
+
 	ret = devm_regmap_add_irq_chip(dev, max77705->regmap,
 					i2c->irq,
 					IRQF_ONESHOT, 0,

drivers/power/supply/88pm860x_charger.c

@@ -284,8 +284,8 @@ static int set_charging_fsm(struct pm860x_charger_info *info)
 {
 	struct power_supply *psy;
 	union power_supply_propval data;
-	unsigned char fsm_state[][16] = { "init", "discharge", "precharge",
-		"fastcharge",
+	static const unsigned char fsm_state[][16] = {
+		"init", "discharge", "precharge", "fastcharge",
 	};
 	int ret;
 	int vbatt;
@@ -313,7 +313,7 @@ static int set_charging_fsm(struct pm860x_charger_info *info)
 
 	dev_dbg(info->dev, "Entering FSM:%s, Charger:%s, Battery:%s, "
 		"Allowed:%d\n",
-		&fsm_state[info->state][0],
+		fsm_state[info->state],
 		(info->online) ? "online" : "N/A",
 		(info->present) ? "present" : "N/A", info->allowed);
 	dev_dbg(info->dev, "set_charging_fsm:vbatt:%d(mV)\n", vbatt);
@@ -385,7 +385,7 @@ static int set_charging_fsm(struct pm860x_charger_info *info)
 	}
 	dev_dbg(info->dev,
 		"Out FSM:%s, Charger:%s, Battery:%s, Allowed:%d\n",
-		&fsm_state[info->state][0],
+		fsm_state[info->state],
 		(info->online) ? "online" : "N/A",
 		(info->present) ? "present" : "N/A", info->allowed);
 	mutex_unlock(&info->lock);

drivers/power/supply/Kconfig

@@ -35,6 +35,9 @@ config APM_POWER
 	  Say Y here to enable support APM status emulation using
 	  battery class devices.
 
+config ADC_BATTERY_HELPER
+	tristate
+
 config GENERIC_ADC_BATTERY
 	tristate "Generic battery support using IIO"
 	depends on IIO
@@ -244,6 +247,18 @@ config BATTERY_INGENIC
 	  This driver can also be built as a module. If so, the module will be
 	  called ingenic-battery.
 
+config BATTERY_INTEL_DC_TI
+	tristate "Intel Bay / Cherry Trail Dollar Cove TI battery driver"
+	depends on INTEL_SOC_PMIC_CHTDC_TI && INTEL_DC_TI_ADC && IIO && ACPI
+	select ADC_BATTERY_HELPER
+	help
+	  Choose this option if you want to monitor battery status on Intel
+	  Bay Trail / Cherry Trail tablets using the Dollar Cove TI PMIC's
+	  coulomb-counter as fuel-gauge.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called intel_dc_ti_battery.
+
 config BATTERY_IPAQ_MICRO
 	tristate "iPAQ Atmel Micro ASIC battery driver"
 	depends on MFD_IPAQ_MICRO
@@ -1050,6 +1065,7 @@ config CHARGER_SURFACE
 config BATTERY_UG3105
 	tristate "uPI uG3105 battery monitor driver"
 	depends on I2C
+	select ADC_BATTERY_HELPER
 	help
 	  Battery monitor driver for the uPI uG3105 battery monitor.
 

drivers/power/supply/Makefile

@@ -7,6 +7,7 @@ power_supply-$(CONFIG_LEDS_TRIGGERS)	+= power_supply_leds.o
 
 obj-$(CONFIG_POWER_SUPPLY)	+= power_supply.o
 obj-$(CONFIG_POWER_SUPPLY_HWMON) += power_supply_hwmon.o
+obj-$(CONFIG_ADC_BATTERY_HELPER) += adc-battery-helper.o
 obj-$(CONFIG_GENERIC_ADC_BATTERY)	+= generic-adc-battery.o
 
 obj-$(CONFIG_APM_POWER)		+= apm_power.o
@@ -41,6 +42,7 @@ obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o
 obj-$(CONFIG_BATTERY_SAMSUNG_SDI)	+= samsung-sdi-battery.o
 obj-$(CONFIG_BATTERY_COLLIE)	+= collie_battery.o
 obj-$(CONFIG_BATTERY_INGENIC)	+= ingenic-battery.o
+obj-$(CONFIG_BATTERY_INTEL_DC_TI) += intel_dc_ti_battery.o
 obj-$(CONFIG_BATTERY_IPAQ_MICRO) += ipaq_micro_battery.o
 obj-$(CONFIG_BATTERY_WM97XX)	+= wm97xx_battery.o
 obj-$(CONFIG_BATTERY_SBS)	+= sbs-battery.o

drivers/power/supply/ab8500_btemp.c

@@ -667,7 +667,8 @@ static int ab8500_btemp_bind(struct device *dev, struct device *master,
 
 	/* Create a work queue for the btemp */
 	di->btemp_wq =
-		alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
+		alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM | WQ_PERCPU,
+				0);
 	if (di->btemp_wq == NULL) {
 		dev_err(dev, "failed to create work queue\n");
 		return -ENOMEM;