Merge tag 'for-v6.4' 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 support for automatic handling of constant battery
   data supplied by firmware

 - generic-adc-battery: major cleanup

 - axp288_charger: fix ACPI issues on x86 Android tablets

 - rk817: cleanup and fix handling for low state of charge

* tag 'for-v6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply: (26 commits)
  power: supply: rk817: Fix low SOC bugs
  power: supply: rk817: Drop unneeded debugging code
  power: supply: axp288_charger: Use alt usb-id extcon on some x86 android tablets
  power: supply: generic-adc-battery: style fixes
  power: supply: generic-adc-battery: improve error message
  power: supply: generic-adc-battery: update copyright info
  power: supply: generic-adc-battery: add DT support
  power: supply: generic-adc-battery: add temperature support
  power: supply: generic-adc-battery: simplify read_channel logic
  power: supply: generic-adc-battery: use simple-battery API
  power: supply: generic-adc-battery: drop memory alloc error message
  power: supply: generic-adc-battery: drop charge now support
  power: supply: generic-adc-battery: drop jitter delay support
  power: supply: generic-adc-battery: fix unit scaling
  power: supply: generic-adc-battery: convert to managed resources
  power: supply: core: auto-exposure of simple-battery data
  dt-bindings: power: supply: adc-battery: add binding
  power: supply: bq256xx: Support to disable charger
  power: supply: charger-manager: Use of_property_read_bool() for boolean properties
  power: reset: qcom-pon: drop of_match_ptr for ID table
  ...

Documentation/devicetree/bindings/power/supply/adc-battery.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/supply/adc-battery.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ADC battery
+
+maintainers:
+  - Sebastian Reichel <sre@kernel.org>
+
+description:
+  Basic battery capacity meter, which only reports basic battery data
+  via ADC channels and optionally indicate that the battery is full by
+  polling a GPIO line.
+
+  The voltage is expected to be measured between the battery terminals
+  and mandatory. The optional current/power channel is expected to
+  monitor the current/power flowing out of the battery. Last but not
+  least the temperature channel is supposed to measure the battery
+  temperature.
+
+allOf:
+  - $ref: power-supply.yaml#
+
+properties:
+  compatible:
+    const: adc-battery
+
+  charged-gpios:
+    description:
+      GPIO which signals that the battery is fully charged. The GPIO is
+      often provided by charger ICs, that are not software controllable.
+    maxItems: 1
+
+  io-channels:
+    minItems: 1
+    maxItems: 4
+
+  io-channel-names:
+    minItems: 1
+    items:
+      - const: voltage
+      - enum: [ current, power, temperature ]
+      - enum: [ power, temperature ]
+      - const: temperature
+
+  monitored-battery: true
+
+required:
+  - compatible
+  - io-channels
+  - io-channel-names
+  - monitored-battery
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    fuel-gauge {
+        compatible = "adc-battery";
+        charged-gpios = <&gpio 42 GPIO_ACTIVE_HIGH>;
+        io-channels = <&adc 13>, <&adc 37>;
+        io-channel-names = "voltage", "current";
+
+        power-supplies = <&charger>;
+        monitored-battery = <&battery>;
+    };

drivers/power/reset/qcom-pon.c

@@ -91,7 +91,7 @@ static struct platform_driver pm8916_pon_driver = {
 	.probe = pm8916_pon_probe,
 	.driver = {
 		.name = "pm8916-pon",
-		.of_match_table = of_match_ptr(pm8916_pon_id_table),
+		.of_match_table = pm8916_pon_id_table,
 	},
 };
 module_platform_driver(pm8916_pon_driver);

drivers/power/supply/axp288_charger.c

@@ -836,6 +836,7 @@ static int axp288_charger_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 	struct power_supply_config charger_cfg = {};
+	const char *extcon_name = NULL;
 	unsigned int val;
 
 	/*
@@ -872,8 +873,18 @@ static int axp288_charger_probe(struct platform_device *pdev)
 		return PTR_ERR(info->cable.edev);
 	}
 
-	if (acpi_dev_present(USB_HOST_EXTCON_HID, NULL, -1)) {
-		info->otg.cable = extcon_get_extcon_dev(USB_HOST_EXTCON_NAME);
+	/*
+	 * On devices with broken ACPI GPIO event handlers there also is no ACPI
+	 * "INT3496" (USB_HOST_EXTCON_HID) device. x86-android-tablets.ko
+	 * instantiates an "intel-int3496" extcon on these devs as a workaround.
+	 */
+	if (acpi_quirk_skip_gpio_event_handlers())
+		extcon_name = "intel-int3496";
+	else if (acpi_dev_present(USB_HOST_EXTCON_HID, NULL, -1))
+		extcon_name = USB_HOST_EXTCON_NAME;
+
+	if (extcon_name) {
+		info->otg.cable = extcon_get_extcon_dev(extcon_name);
 		if (IS_ERR(info->otg.cable)) {
 			dev_err_probe(dev, PTR_ERR(info->otg.cable),
 				      "extcon_get_extcon_dev(%s) failed\n",

drivers/power/supply/bq24257_charger.c

@@ -1140,7 +1140,7 @@ static const struct i2c_device_id bq24257_i2c_ids[] = {
 };
 MODULE_DEVICE_TABLE(i2c, bq24257_i2c_ids);
 
-static const struct of_device_id bq24257_of_match[] = {
+static const struct of_device_id bq24257_of_match[] __maybe_unused = {
 	{ .compatible = "ti,bq24250", },
 	{ .compatible = "ti,bq24251", },
 	{ .compatible = "ti,bq24257", },

drivers/power/supply/bq256xx_charger.c

@@ -70,6 +70,9 @@
 #define BQ25611D_VBATREG_THRESH_uV	4290000
 #define BQ25618_VBATREG_THRESH_uV	4300000
 
+#define BQ256XX_CHG_CONFIG_MASK		BIT(4)
+#define BQ256XX_CHG_CONFIG_BIT_SHIFT	4
+
 #define BQ256XX_ITERM_MASK		GENMASK(3, 0)
 #define BQ256XX_ITERM_STEP_uA		60000
 #define BQ256XX_ITERM_OFFSET_uA		60000
@@ -259,6 +262,7 @@ struct bq256xx_device {
  * @bq256xx_set_iterm: pointer to instance specific set_iterm function
  * @bq256xx_set_iprechg: pointer to instance specific set_iprechg function
  * @bq256xx_set_vindpm: pointer to instance specific set_vindpm function
+ * @bq256xx_set_charge_type: pointer to instance specific set_charge_type function
  *
  * @bq256xx_def_ichg: default ichg value in microamps
  * @bq256xx_def_iindpm: default iindpm value in microamps
@@ -290,6 +294,7 @@ struct bq256xx_chip_info {
 	int (*bq256xx_set_iterm)(struct bq256xx_device *bq, int iterm);
 	int (*bq256xx_set_iprechg)(struct bq256xx_device *bq, int iprechg);
 	int (*bq256xx_set_vindpm)(struct bq256xx_device *bq, int vindpm);
+	int (*bq256xx_set_charge_type)(struct bq256xx_device *bq, int type);
 
 	int bq256xx_def_ichg;
 	int bq256xx_def_iindpm;
@@ -449,6 +454,27 @@ static int bq256xx_get_state(struct bq256xx_device *bq,
 	return 0;
 }
 
+static int bq256xx_set_charge_type(struct bq256xx_device *bq, int type)
+{
+	int chg_config = 0;
+
+	switch (type) {
+	case POWER_SUPPLY_CHARGE_TYPE_NONE:
+		chg_config = 0x0;
+		break;
+	case POWER_SUPPLY_CHARGE_TYPE_TRICKLE:
+	case POWER_SUPPLY_CHARGE_TYPE_FAST:
+		chg_config = 0x1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return regmap_update_bits(bq->regmap, BQ256XX_CHARGER_CONTROL_0,
+				BQ256XX_CHG_CONFIG_MASK,
+				(chg_config ? 1 : 0) << BQ256XX_CHG_CONFIG_BIT_SHIFT);
+}
+
 static int bq256xx_get_ichg_curr(struct bq256xx_device *bq)
 {
 	unsigned int charge_current_limit;
@@ -915,6 +941,12 @@ static int bq256xx_set_charger_property(struct power_supply *psy,
 			return ret;
 		break;
 
+	case POWER_SUPPLY_PROP_CHARGE_TYPE:
+		ret = bq->chip_info->bq256xx_set_charge_type(bq, val->intval);
+		if (ret)
+			return ret;
+		break;
+
 	default:
 		break;
 	}
@@ -1197,6 +1229,7 @@ static int bq256xx_property_is_writeable(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 	case POWER_SUPPLY_PROP_STATUS:
 	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+	case POWER_SUPPLY_PROP_CHARGE_TYPE:
 		return true;
 	default:
 		return false;
@@ -1286,6 +1319,7 @@ static const struct bq256xx_chip_info bq256xx_chip_info_tbl[] = {
 		.bq256xx_set_iterm = bq256xx_set_term_curr,
 		.bq256xx_set_iprechg = bq256xx_set_prechrg_curr,
 		.bq256xx_set_vindpm = bq256xx_set_input_volt_lim,
+		.bq256xx_set_charge_type = bq256xx_set_charge_type,
 
 		.bq256xx_def_ichg = BQ2560X_ICHG_DEF_uA,
 		.bq256xx_def_iindpm = BQ256XX_IINDPM_DEF_uA,
@@ -1316,6 +1350,7 @@ static const struct bq256xx_chip_info bq256xx_chip_info_tbl[] = {
 		.bq256xx_set_iterm = bq256xx_set_term_curr,
 		.bq256xx_set_iprechg = bq256xx_set_prechrg_curr,
 		.bq256xx_set_vindpm = bq256xx_set_input_volt_lim,
+		.bq256xx_set_charge_type = bq256xx_set_charge_type,
 
 		.bq256xx_def_ichg = BQ2560X_ICHG_DEF_uA,
 		.bq256xx_def_iindpm = BQ256XX_IINDPM_DEF_uA,
@@ -1346,6 +1381,7 @@ static const struct bq256xx_chip_info bq256xx_chip_info_tbl[] = {
 		.bq256xx_set_iterm = bq256xx_set_term_curr,
 		.bq256xx_set_iprechg = bq256xx_set_prechrg_curr,
 		.bq256xx_set_vindpm = bq256xx_set_input_volt_lim,
+		.bq256xx_set_charge_type = bq256xx_set_charge_type,
 
 		.bq256xx_def_ichg = BQ2560X_ICHG_DEF_uA,
 		.bq256xx_def_iindpm = BQ256XX_IINDPM_DEF_uA,
@@ -1376,6 +1412,7 @@ static const struct bq256xx_chip_info bq256xx_chip_info_tbl[] = {
 		.bq256xx_set_iterm = bq256xx_set_term_curr,
 		.bq256xx_set_iprechg = bq256xx_set_prechrg_curr,
 		.bq256xx_set_vindpm = bq256xx_set_input_volt_lim,
+		.bq256xx_set_charge_type = bq256xx_set_charge_type,
 
 		.bq256xx_def_ichg = BQ2560X_ICHG_DEF_uA,
 		.bq256xx_def_iindpm = BQ256XX_IINDPM_DEF_uA,
@@ -1406,6 +1443,7 @@ static const struct bq256xx_chip_info bq256xx_chip_info_tbl[] = {
 		.bq256xx_set_iterm = bq256xx_set_term_curr,
 		.bq256xx_set_iprechg = bq256xx_set_prechrg_curr,
 		.bq256xx_set_vindpm = bq256xx_set_input_volt_lim,
+		.bq256xx_set_charge_type = bq256xx_set_charge_type,
 
 		.bq256xx_def_ichg = BQ25611D_ICHG_DEF_uA,
 		.bq256xx_def_iindpm = BQ256XX_IINDPM_DEF_uA,
@@ -1436,6 +1474,7 @@ static const struct bq256xx_chip_info bq256xx_chip_info_tbl[] = {
 		.bq256xx_set_iterm = bq25618_619_set_term_curr,
 		.bq256xx_set_iprechg = bq25618_619_set_prechrg_curr,
 		.bq256xx_set_vindpm = bq256xx_set_input_volt_lim,
+		.bq256xx_set_charge_type = bq256xx_set_charge_type,
 
 		.bq256xx_def_ichg = BQ25618_ICHG_DEF_uA,
 		.bq256xx_def_iindpm = BQ256XX_IINDPM_DEF_uA,
@@ -1466,6 +1505,7 @@ static const struct bq256xx_chip_info bq256xx_chip_info_tbl[] = {
 		.bq256xx_set_iterm = bq25618_619_set_term_curr,
 		.bq256xx_set_iprechg = bq25618_619_set_prechrg_curr,
 		.bq256xx_set_vindpm = bq256xx_set_input_volt_lim,
+		.bq256xx_set_charge_type = bq256xx_set_charge_type,
 
 		.bq256xx_def_ichg = BQ25618_ICHG_DEF_uA,
 		.bq256xx_def_iindpm = BQ256XX_IINDPM_DEF_uA,

drivers/power/supply/bq25890_charger.c

@@ -1622,7 +1622,7 @@ static const struct i2c_device_id bq25890_i2c_ids[] = {
 };
 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
 
-static const struct of_device_id bq25890_of_match[] = {
+static const struct of_device_id bq25890_of_match[] __maybe_unused = {
 	{ .compatible = "ti,bq25890", },
 	{ .compatible = "ti,bq25892", },
 	{ .compatible = "ti,bq25895", },

drivers/power/supply/charger-manager.c

@@ -1331,7 +1331,7 @@ static struct charger_desc *of_cm_parse_desc(struct device *dev)
 	of_property_read_string(np, "cm-thermal-zone", &desc->thermal_zone);
 
 	of_property_read_u32(np, "cm-battery-cold", &desc->temp_min);
-	if (of_get_property(np, "cm-battery-cold-in-minus", NULL))
+	if (of_property_read_bool(np, "cm-battery-cold-in-minus"))
 		desc->temp_min *= -1;
 	of_property_read_u32(np, "cm-battery-hot", &desc->temp_max);
 	of_property_read_u32(np, "cm-battery-temp-diff", &desc->temp_diff);

drivers/power/supply/lp8727_charger.c

@@ -598,7 +598,7 @@ static void lp8727_remove(struct i2c_client *cl)
 	lp8727_unregister_psy(pchg);
 }
 
-static const struct of_device_id lp8727_dt_ids[] = {
+static const struct of_device_id lp8727_dt_ids[] __maybe_unused = {
 	{ .compatible = "ti,lp8727", },
 	{ }
 };

drivers/power/supply/ltc4162-l-charger.c

@@ -908,7 +908,7 @@ static const struct i2c_device_id ltc4162l_i2c_id_table[] = {
 };
 MODULE_DEVICE_TABLE(i2c, ltc4162l_i2c_id_table);
 
-static const struct of_device_id ltc4162l_of_match[] = {
+static const struct of_device_id ltc4162l_of_match[] __maybe_unused = {
 	{ .compatible = "lltc,ltc4162-l", },
 	{ },
 };

drivers/power/supply/power_supply_core.c

@@ -388,7 +388,7 @@ static int __power_supply_get_supplier_property(struct device *dev, void *_data)
 	struct psy_get_supplier_prop_data *data = _data;
 
 	if (__power_supply_is_supplied_by(epsy, data->psy))
-		if (!epsy->desc->get_property(epsy, data->psp, data->val))
+		if (!power_supply_get_property(epsy, data->psp, data->val))
 			return 1; /* Success */
 
 	return 0; /* Continue iterating */
@@ -832,6 +832,133 @@ void power_supply_put_battery_info(struct power_supply *psy,
 }
 EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
 
+const enum power_supply_property power_supply_battery_info_properties[] = {
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
+	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
+	POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
+	POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
+	POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
+	POWER_SUPPLY_PROP_TEMP_MIN,
+	POWER_SUPPLY_PROP_TEMP_MAX,
+};
+EXPORT_SYMBOL_GPL(power_supply_battery_info_properties);
+
+const size_t power_supply_battery_info_properties_size = ARRAY_SIZE(power_supply_battery_info_properties);
+EXPORT_SYMBOL_GPL(power_supply_battery_info_properties_size);
+
+bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
+				        enum power_supply_property psp)
+{
+	if (!info)
+		return false;
+
+	switch (psp) {
+		case POWER_SUPPLY_PROP_TECHNOLOGY:
+			return info->technology != POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
+		case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+			return info->energy_full_design_uwh >= 0;
+		case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+			return info->charge_full_design_uah >= 0;
+		case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+			return info->voltage_min_design_uv >= 0;
+		case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+			return info->voltage_max_design_uv >= 0;
+		case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+			return info->precharge_current_ua >= 0;
+		case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+			return info->charge_term_current_ua >= 0;
+		case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+			return info->constant_charge_current_max_ua >= 0;
+		case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+			return info->constant_charge_voltage_max_uv >= 0;
+		case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
+			return info->temp_ambient_alert_min > INT_MIN;
+		case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
+			return info->temp_ambient_alert_max < INT_MAX;
+		case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
+			return info->temp_alert_min > INT_MIN;
+		case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
+			return info->temp_alert_max < INT_MAX;
+		case POWER_SUPPLY_PROP_TEMP_MIN:
+			return info->temp_min > INT_MIN;
+		case POWER_SUPPLY_PROP_TEMP_MAX:
+			return info->temp_max < INT_MAX;
+		default:
+			return false;
+	}
+}
+EXPORT_SYMBOL_GPL(power_supply_battery_info_has_prop);
+
+int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
+				       enum power_supply_property psp,
+				       union power_supply_propval *val)
+{
+	if (!info)
+		return -EINVAL;
+
+	if (!power_supply_battery_info_has_prop(info, psp))
+		return -EINVAL;
+
+	switch (psp) {
+		case POWER_SUPPLY_PROP_TECHNOLOGY:
+			val->intval = info->technology;
+			return 0;
+		case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+			val->intval = info->energy_full_design_uwh;
+			return 0;
+		case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+			val->intval = info->charge_full_design_uah;
+			return 0;
+		case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+			val->intval = info->voltage_min_design_uv;
+			return 0;
+		case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+			val->intval = info->voltage_max_design_uv;
+			return 0;
+		case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+			val->intval = info->precharge_current_ua;
+			return 0;
+		case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+			val->intval = info->charge_term_current_ua;
+			return 0;
+		case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+			val->intval = info->constant_charge_current_max_ua;
+			return 0;
+		case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+			val->intval = info->constant_charge_voltage_max_uv;
+			return 0;
+		case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
+			val->intval = info->temp_ambient_alert_min;
+			return 0;
+		case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
+			val->intval = info->temp_ambient_alert_max;
+			return 0;
+		case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
+			val->intval = info->temp_alert_min;
+			return 0;
+		case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
+			val->intval = info->temp_alert_max;
+			return 0;
+		case POWER_SUPPLY_PROP_TEMP_MIN:
+			val->intval = info->temp_min;
+			return 0;
+		case POWER_SUPPLY_PROP_TEMP_MAX:
+			val->intval = info->temp_max;
+			return 0;
+		default:
+			return -EINVAL;
+	}
+}
+EXPORT_SYMBOL_GPL(power_supply_battery_info_get_prop);
+
 /**
  * power_supply_temp2resist_simple() - find the battery internal resistance
  * percent from temperature
@@ -1046,6 +1173,22 @@ bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
 }
 EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);
 
+static bool psy_has_property(const struct power_supply_desc *psy_desc,
+			     enum power_supply_property psp)
+{
+	bool found = false;
+	int i;
+
+	for (i = 0; i < psy_desc->num_properties; i++) {
+		if (psy_desc->properties[i] == psp) {
+			found = true;
+			break;
+		}
+	}
+
+	return found;
+}
+
 int power_supply_get_property(struct power_supply *psy,
 			    enum power_supply_property psp,
 			    union power_supply_propval *val)
@@ -1056,7 +1199,12 @@ int power_supply_get_property(struct power_supply *psy,
 		return -ENODEV;
 	}
 
+	if (psy_has_property(psy->desc, psp))
 		return psy->desc->get_property(psy, psp, val);
+	else if (power_supply_battery_info_has_prop(psy->battery_info, psp))
+		return power_supply_battery_info_get_prop(psy->battery_info, psp, val);
+	else
+		return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(power_supply_get_property);
 
@@ -1117,22 +1265,6 @@ void power_supply_unreg_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
 
-static bool psy_has_property(const struct power_supply_desc *psy_desc,
-			     enum power_supply_property psp)
-{
-	bool found = false;
-	int i;
-
-	for (i = 0; i < psy_desc->num_properties; i++) {
-		if (psy_desc->properties[i] == psp) {
-			found = true;
-			break;
-		}
-	}
-
-	return found;
-}
-
 #ifdef CONFIG_THERMAL
 static int power_supply_read_temp(struct thermal_zone_device *tzd,
 		int *temp)
@@ -1255,6 +1387,17 @@ __power_supply_register(struct device *parent,
 		goto check_supplies_failed;
 	}
 
+	/*
+	 * Expose constant battery info, if it is available. While there are
+	 * some chargers accessing constant battery data, we only want to
+	 * expose battery data to userspace for battery devices.
+	 */
+	if (desc->type == POWER_SUPPLY_TYPE_BATTERY) {
+		rc = power_supply_get_battery_info(psy, &psy->battery_info);
+		if (rc && rc != -ENODEV && rc != -ENOENT)
+			goto check_supplies_failed;
+	}
+
 	spin_lock_init(&psy->changed_lock);
 	rc = device_add(dev);
 	if (rc)

drivers/power/supply/power_supply_sysfs.c

@@ -221,9 +221,10 @@ static struct power_supply_attr power_supply_attrs[] = {
 	POWER_SUPPLY_ATTR(MANUFACTURER),
 	POWER_SUPPLY_ATTR(SERIAL_NUMBER),
 };
+#define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)
 
 static struct attribute *
-__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
+__power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1];
 
 static struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
 {
@@ -380,6 +381,9 @@ static umode_t power_supply_attr_is_visible(struct kobject *kobj,
 		}
 	}
 
+	if (power_supply_battery_info_has_prop(psy->battery_info, attrno))
+		return mode;
+
 	return 0;
 }
 
@@ -461,6 +465,10 @@ static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env
 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	const struct power_supply *psy = dev_get_drvdata(dev);
+	const enum power_supply_property *battery_props =
+		power_supply_battery_info_properties;
+	unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT /
+					 sizeof(unsigned long) + 1] = {0};
 	int ret = 0, j;
 	char *prop_buf;
 
@@ -482,12 +490,25 @@ int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
 		goto out;
 
 	for (j = 0; j < psy->desc->num_properties; j++) {
+		set_bit(psy->desc->properties[j], psy_drv_properties);
 		ret = add_prop_uevent(dev, env, psy->desc->properties[j],
 				      prop_buf);
 		if (ret)
 			goto out;
 	}
 
+	for (j = 0; j < power_supply_battery_info_properties_size; j++) {
+		if (test_bit(battery_props[j], psy_drv_properties))
+			continue;
+		if (!power_supply_battery_info_has_prop(psy->battery_info,
+				battery_props[j]))
+			continue;
+		ret = add_prop_uevent(dev, env, battery_props[j],
+			      prop_buf);
+		if (ret)
+			goto out;
+	}
+
 out:
 	free_page((unsigned long)prop_buf);
 

drivers/power/supply/rk817_charger.c

@@ -335,6 +335,20 @@ static int rk817_bat_calib_cap(struct rk817_charger *charger)
 			charger->fcc_mah * 1000);
 	}
 
+	/*
+	 * Set the SOC to 0 if we are below the minimum system voltage.
+	 */
+	if (volt_avg <= charger->bat_voltage_min_design_uv) {
+		charger->soc = 0;
+		charge_now_adc = CHARGE_TO_ADC(0, charger->res_div);
+		put_unaligned_be32(charge_now_adc, bulk_reg);
+		regmap_bulk_write(rk808->regmap,
+				  RK817_GAS_GAUGE_Q_INIT_H3, bulk_reg, 4);
+		dev_warn(charger->dev,
+			 "Battery voltage %d below minimum voltage %d\n",
+			 volt_avg, charger->bat_voltage_min_design_uv);
+		}
+
 	rk817_record_battery_nvram_values(charger);
 
 	return 0;
@@ -710,9 +724,10 @@ static int rk817_read_battery_nvram_values(struct rk817_charger *charger)
 
 	/*
 	 * Read the nvram for state of charge. Sanity check for values greater
-	 * than 100 (10000). If the value is off it should get corrected
-	 * automatically when the voltage drops to the min (soc is 0) or when
-	 * the battery is full (soc is 100).
+	 * than 100 (10000) or less than 0, because other things (BSP kernels,
+	 * U-Boot, or even i2cset) can write to this register. If the value is
+	 * off it should get corrected automatically when the voltage drops to
+	 * the min (soc is 0) or when the battery is full (soc is 100).
 	 */
 	ret = regmap_bulk_read(charger->rk808->regmap,
 			       RK817_GAS_GAUGE_BAT_R1, bulk_reg, 3);
@@ -721,6 +736,8 @@ static int rk817_read_battery_nvram_values(struct rk817_charger *charger)
 	charger->soc = get_unaligned_le24(bulk_reg);
 	if (charger->soc > 10000)
 		charger->soc = 10000;
+	if (charger->soc < 0)
+		charger->soc = 0;
 
 	return 0;
 }
@@ -731,8 +748,8 @@ rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
 {
 	struct rk808 *rk808 = charger->rk808;
 	u8 bulk_reg[4];
-	u32 boot_voltage, boot_charge_mah, tmp;
-	int ret, reg, off_time;
+	u32 boot_voltage, boot_charge_mah;
+	int ret, reg, off_time, tmp;
 	bool first_boot;
 
 	/*
@@ -785,10 +802,12 @@ rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
 		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
 				 bulk_reg, 4);
 		tmp = get_unaligned_be32(bulk_reg);
+		if (tmp < 0)
+			tmp = 0;
 		boot_charge_mah = ADC_TO_CHARGE_UAH(tmp,
 						    charger->res_div) / 1000;
 		/*
-		 * Check if the columb counter has been off for more than 300
+		 * Check if the columb counter has been off for more than 30
 		 * minutes as it tends to drift downward. If so, re-init soc
 		 * with the boot voltage instead. Note the unit values for the
 		 * OFF_CNT register appear to be in decaminutes and stops
@@ -799,7 +818,7 @@ rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
 		 * than 0 on a reboot anyway.
 		 */
 		regmap_read(rk808->regmap, RK817_GAS_GAUGE_OFF_CNT, &off_time);
-		if (off_time >= 30) {
+		if (off_time >= 3) {
 			regmap_bulk_read(rk808->regmap,
 					 RK817_GAS_GAUGE_PWRON_VOL_H,
 					 bulk_reg, 2);
@@ -816,19 +835,6 @@ rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
 		}
 	}
 
-	regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_PWRON_VOL_H,
-			 bulk_reg, 2);
-	tmp = get_unaligned_be16(bulk_reg);
-	boot_voltage = (charger->voltage_k * tmp) + 1000 * charger->voltage_b;
-	regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
-			 bulk_reg, 4);
-	tmp = get_unaligned_be32(bulk_reg);
-	boot_charge_mah = ADC_TO_CHARGE_UAH(tmp, charger->res_div) / 1000;
-	regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_OCV_VOL_H,
-			 bulk_reg, 2);
-	tmp = get_unaligned_be16(bulk_reg);
-	boot_voltage = (charger->voltage_k * tmp) + 1000 * charger->voltage_b;
-
 	/*
 	 * Now we have our full charge capacity and soc, init the columb
 	 * counter.

drivers/power/supply/rt9455_charger.c

@@ -1722,7 +1722,7 @@ static const struct i2c_device_id rt9455_i2c_id_table[] = {
 };
 MODULE_DEVICE_TABLE(i2c, rt9455_i2c_id_table);
 
-static const struct of_device_id rt9455_of_match[] = {
+static const struct of_device_id rt9455_of_match[] __maybe_unused = {
 	{ .compatible = "richtek,rt9455", },
 	{ },
 };

drivers/power/supply/twl4030_charger.c

@@ -1126,7 +1126,7 @@ static int twl4030_bci_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct of_device_id twl_bci_of_match[] = {
+static const struct of_device_id twl_bci_of_match[] __maybe_unused = {
 	{.compatible = "ti,twl4030-bci", },
 	{ }
 };

include/linux/power/generic-adc-battery.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2012, Anish Kumar <anish198519851985@gmail.com>
- */
-
-#ifndef GENERIC_ADC_BATTERY_H
-#define GENERIC_ADC_BATTERY_H
-
-/**
- * struct gab_platform_data - platform_data for generic adc iio battery driver.
- * @battery_info:         recommended structure to specify static power supply
- *			   parameters
- * @cal_charge:           calculate charge level.
- * @jitter_delay:         delay required after the interrupt to check battery
- *			  status.Default set is 10ms.
- */
-struct gab_platform_data {
-	struct power_supply_info battery_info;
-	int	(*cal_charge)(long value);
-	int     jitter_delay;
-};
-
-#endif /* GENERIC_ADC_BATTERY_H */

include/linux/power_supply.h

@@ -301,6 +301,7 @@ struct power_supply {
 	bool initialized;
 	bool removing;
 	atomic_t use_cnt;
+	struct power_supply_battery_info *battery_info;
 #ifdef CONFIG_THERMAL
 	struct thermal_zone_device *tzd;
 	struct thermal_cooling_device *tcd;
@@ -791,10 +792,17 @@ devm_power_supply_get_by_phandle(struct device *dev, const char *property)
 { return NULL; }
 #endif /* CONFIG_OF */
 
+extern const enum power_supply_property power_supply_battery_info_properties[];
+extern const size_t power_supply_battery_info_properties_size;
 extern int power_supply_get_battery_info(struct power_supply *psy,
 					 struct power_supply_battery_info **info_out);
 extern void power_supply_put_battery_info(struct power_supply *psy,
 					  struct power_supply_battery_info *info);
+extern bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
+					       enum power_supply_property psp);
+extern int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
+					      enum power_supply_property psp,
+					      union power_supply_propval *val);
 extern int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
 				       int table_len, int ocv);
 extern struct power_supply_battery_ocv_table *