Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 660 insertions, 0 deletions

diff --git a/drivers/power/supply/axp20x_battery.c b/drivers/power/supply/axp20x_battery.c
new file mode 100644
index 000000000..9106077c0
--- /dev/null
+++ b/drivers/power/supply/axp20x_battery.c
@@ -0,0 +1,660 @@
+/*
+ * Battery power supply driver for X-Powers AXP20X and AXP22X PMICs
+ *
+ * Copyright 2016 Free Electrons NextThing Co.
+ *	Quentin Schulz <quentin.schulz@free-electrons.com>
+ *
+ * This driver is based on a previous upstreaming attempt by:
+ *	Bruno Prémont <bonbons@linux-vserver.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/consumer.h>
+#include <linux/mfd/axp20x.h>
+
+#define AXP20X_PWR_STATUS_BAT_CHARGING	BIT(2)
+
+#define AXP20X_PWR_OP_BATT_PRESENT	BIT(5)
+#define AXP20X_PWR_OP_BATT_ACTIVATED	BIT(3)
+
+#define AXP209_FG_PERCENT		GENMASK(6, 0)
+#define AXP22X_FG_VALID			BIT(7)
+
+#define AXP20X_CHRG_CTRL1_ENABLE	BIT(7)
+#define AXP20X_CHRG_CTRL1_TGT_VOLT	GENMASK(6, 5)
+#define AXP20X_CHRG_CTRL1_TGT_4_1V	(0 << 5)
+#define AXP20X_CHRG_CTRL1_TGT_4_15V	(1 << 5)
+#define AXP20X_CHRG_CTRL1_TGT_4_2V	(2 << 5)
+#define AXP20X_CHRG_CTRL1_TGT_4_36V	(3 << 5)
+
+#define AXP22X_CHRG_CTRL1_TGT_4_22V	(1 << 5)
+#define AXP22X_CHRG_CTRL1_TGT_4_24V	(3 << 5)
+
+#define AXP813_CHRG_CTRL1_TGT_4_35V	(3 << 5)
+
+#define AXP20X_CHRG_CTRL1_TGT_CURR	GENMASK(3, 0)
+
+#define AXP20X_V_OFF_MASK		GENMASK(2, 0)
+
+struct axp20x_batt_ps;
+
+struct axp_data {
+	int	ccc_scale;
+	int	ccc_offset;
+	bool	has_fg_valid;
+	int	(*get_max_voltage)(struct axp20x_batt_ps *batt, int *val);
+	int	(*set_max_voltage)(struct axp20x_batt_ps *batt, int val);
+};
+
+struct axp20x_batt_ps {
+	struct regmap *regmap;
+	struct power_supply *batt;
+	struct device *dev;
+	struct iio_channel *batt_chrg_i;
+	struct iio_channel *batt_dischrg_i;
+	struct iio_channel *batt_v;
+	/* Maximum constant charge current */
+	unsigned int max_ccc;
+	const struct axp_data	*data;
+};
+
+static int axp20x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
+					  int *val)
+{
+	int ret, reg;
+
+	ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
+	if (ret)
+		return ret;
+
+	switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
+	case AXP20X_CHRG_CTRL1_TGT_4_1V:
+		*val = 4100000;
+		break;
+	case AXP20X_CHRG_CTRL1_TGT_4_15V:
+		*val = 4150000;
+		break;
+	case AXP20X_CHRG_CTRL1_TGT_4_2V:
+		*val = 4200000;
+		break;
+	case AXP20X_CHRG_CTRL1_TGT_4_36V:
+		*val = 4360000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int axp22x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
+					  int *val)
+{
+	int ret, reg;
+
+	ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
+	if (ret)
+		return ret;
+
+	switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
+	case AXP20X_CHRG_CTRL1_TGT_4_1V:
+		*val = 4100000;
+		break;
+	case AXP20X_CHRG_CTRL1_TGT_4_2V:
+		*val = 4200000;
+		break;
+	case AXP22X_CHRG_CTRL1_TGT_4_22V:
+		*val = 4220000;
+		break;
+	case AXP22X_CHRG_CTRL1_TGT_4_24V:
+		*val = 4240000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int axp813_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
+					  int *val)
+{
+	int ret, reg;
+
+	ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
+	if (ret)
+		return ret;
+
+	switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
+	case AXP20X_CHRG_CTRL1_TGT_4_1V:
+		*val = 4100000;
+		break;
+	case AXP20X_CHRG_CTRL1_TGT_4_15V:
+		*val = 4150000;
+		break;
+	case AXP20X_CHRG_CTRL1_TGT_4_2V:
+		*val = 4200000;
+		break;
+	case AXP813_CHRG_CTRL1_TGT_4_35V:
+		*val = 4350000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp,
+					      int *val)
+{
+	int ret;
+
+	ret = regmap_read(axp->regmap, AXP20X_CHRG_CTRL1, val);
+	if (ret)
+		return ret;
+
+	*val &= AXP20X_CHRG_CTRL1_TGT_CURR;
+
+	*val = *val * axp->data->ccc_scale + axp->data->ccc_offset;
+
+	return 0;
+}
+
+static int axp20x_battery_get_prop(struct power_supply *psy,
+				   enum power_supply_property psp,
+				   union power_supply_propval *val)
+{
+	struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy);
+	int ret = 0, reg, val1;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_PRESENT:
+	case POWER_SUPPLY_PROP_ONLINE:
+		ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
+				  &reg);
+		if (ret)
+			return ret;
+
+		val->intval = !!(reg & AXP20X_PWR_OP_BATT_PRESENT);
+		break;
+
+	case POWER_SUPPLY_PROP_STATUS:
+		ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS,
+				  &reg);
+		if (ret)
+			return ret;
+
+		if (reg & AXP20X_PWR_STATUS_BAT_CHARGING) {
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			return 0;
+		}
+
+		ret = iio_read_channel_processed(axp20x_batt->batt_dischrg_i,
+						 &val1);
+		if (ret)
+			return ret;
+
+		if (val1) {
+			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+			return 0;
+		}
+
+		ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, &val1);
+		if (ret)
+			return ret;
+
+		/*
+		 * Fuel Gauge data takes 7 bits but the stored value seems to be
+		 * directly the raw percentage without any scaling to 7 bits.
+		 */
+		if ((val1 & AXP209_FG_PERCENT) == 100)
+			val->intval = POWER_SUPPLY_STATUS_FULL;
+		else
+			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		break;
+
+	case POWER_SUPPLY_PROP_HEALTH:
+		ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
+				  &val1);
+		if (ret)
+			return ret;
+
+		if (val1 & AXP20X_PWR_OP_BATT_ACTIVATED) {
+			val->intval = POWER_SUPPLY_HEALTH_DEAD;
+			return 0;
+		}
+
+		val->intval = POWER_SUPPLY_HEALTH_GOOD;
+		break;
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		ret = axp20x_get_constant_charge_current(axp20x_batt,
+							 &val->intval);
+		if (ret)
+			return ret;
+		break;
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+		val->intval = axp20x_batt->max_ccc;
+		break;
+
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS,
+				  &reg);
+		if (ret)
+			return ret;
+
+		if (reg & AXP20X_PWR_STATUS_BAT_CHARGING) {
+			ret = iio_read_channel_processed(axp20x_batt->batt_chrg_i, &val->intval);
+		} else {
+			ret = iio_read_channel_processed(axp20x_batt->batt_dischrg_i, &val1);
+			val->intval = -val1;
+		}
+		if (ret)
+			return ret;
+
+		/* IIO framework gives mA but Power Supply framework gives uA */
+		val->intval *= 1000;
+		break;
+
+	case POWER_SUPPLY_PROP_CAPACITY:
+		/* When no battery is present, return capacity is 100% */
+		ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
+				  &reg);
+		if (ret)
+			return ret;
+
+		if (!(reg & AXP20X_PWR_OP_BATT_PRESENT)) {
+			val->intval = 100;
+			return 0;
+		}
+
+		ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, &reg);
+		if (ret)
+			return ret;
+
+		if (axp20x_batt->data->has_fg_valid && !(reg & AXP22X_FG_VALID))
+			return -EINVAL;
+
+		/*
+		 * Fuel Gauge data takes 7 bits but the stored value seems to be
+		 * directly the raw percentage without any scaling to 7 bits.
+		 */
+		val->intval = reg & AXP209_FG_PERCENT;
+		break;
+
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+		return axp20x_batt->data->get_max_voltage(axp20x_batt,
+							  &val->intval);
+
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		ret = regmap_read(axp20x_batt->regmap, AXP20X_V_OFF, &reg);
+		if (ret)
+			return ret;
+
+		val->intval = 2600000 + 100000 * (reg & AXP20X_V_OFF_MASK);
+		break;
+
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		ret = iio_read_channel_processed(axp20x_batt->batt_v,
+						 &val->intval);
+		if (ret)
+			return ret;
+
+		/* IIO framework gives mV but Power Supply framework gives uV */
+		val->intval *= 1000;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int axp22x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
+					  int val)
+{
+	switch (val) {
+	case 4100000:
+		val = AXP20X_CHRG_CTRL1_TGT_4_1V;
+		break;
+
+	case 4200000:
+		val = AXP20X_CHRG_CTRL1_TGT_4_2V;
+		break;
+
+	default:
+		/*
+		 * AXP20x max voltage can be set to 4.36V and AXP22X max voltage
+		 * can be set to 4.22V and 4.24V, but these voltages are too
+		 * high for Lithium based batteries (AXP PMICs are supposed to
+		 * be used with these kinds of battery).
+		 */
+		return -EINVAL;
+	}
+
+	return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
+				  AXP20X_CHRG_CTRL1_TGT_VOLT, val);
+}
+
+static int axp20x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
+					  int val)
+{
+	switch (val) {
+	case 4100000:
+		val = AXP20X_CHRG_CTRL1_TGT_4_1V;
+		break;
+
+	case 4150000:
+		val = AXP20X_CHRG_CTRL1_TGT_4_15V;
+		break;
+
+	case 4200000:
+		val = AXP20X_CHRG_CTRL1_TGT_4_2V;
+		break;
+
+	default:
+		/*
+		 * AXP20x max voltage can be set to 4.36V and AXP22X max voltage
+		 * can be set to 4.22V and 4.24V, but these voltages are too
+		 * high for Lithium based batteries (AXP PMICs are supposed to
+		 * be used with these kinds of battery).
+		 */
+		return -EINVAL;
+	}
+
+	return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
+				  AXP20X_CHRG_CTRL1_TGT_VOLT, val);
+}
+
+static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt,
+					      int charge_current)
+{
+	if (charge_current > axp_batt->max_ccc)
+		return -EINVAL;
+
+	charge_current = (charge_current - axp_batt->data->ccc_offset) /
+		axp_batt->data->ccc_scale;
+
+	if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
+		return -EINVAL;
+
+	return regmap_update_bits(axp_batt->regmap, AXP20X_CHRG_CTRL1,
+				  AXP20X_CHRG_CTRL1_TGT_CURR, charge_current);
+}
+
+static int axp20x_set_max_constant_charge_current(struct axp20x_batt_ps *axp,
+						  int charge_current)
+{
+	bool lower_max = false;
+
+	charge_current = (charge_current - axp->data->ccc_offset) /
+		axp->data->ccc_scale;
+
+	if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
+		return -EINVAL;
+
+	charge_current = charge_current * axp->data->ccc_scale +
+		axp->data->ccc_offset;
+
+	if (charge_current > axp->max_ccc)
+		dev_warn(axp->dev,
+			 "Setting max constant charge current higher than previously defined. Note that increasing the constant charge current may damage your battery.\n");
+	else
+		lower_max = true;
+
+	axp->max_ccc = charge_current;
+
+	if (lower_max) {
+		int current_cc;
+
+		axp20x_get_constant_charge_current(axp, &current_cc);
+		if (current_cc > charge_current)
+			axp20x_set_constant_charge_current(axp, charge_current);
+	}
+
+	return 0;
+}
+static int axp20x_set_voltage_min_design(struct axp20x_batt_ps *axp_batt,
+					 int min_voltage)
+{
+	int val1 = (min_voltage - 2600000) / 100000;
+
+	if (val1 < 0 || val1 > AXP20X_V_OFF_MASK)
+		return -EINVAL;
+
+	return regmap_update_bits(axp_batt->regmap, AXP20X_V_OFF,
+				  AXP20X_V_OFF_MASK, val1);
+}
+
+static int axp20x_battery_set_prop(struct power_supply *psy,
+				   enum power_supply_property psp,
+				   const union power_supply_propval *val)
+{
+	struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		return axp20x_set_voltage_min_design(axp20x_batt, val->intval);
+
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+		return axp20x_batt->data->set_max_voltage(axp20x_batt, val->intval);
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		return axp20x_set_constant_charge_current(axp20x_batt,
+							  val->intval);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+		return axp20x_set_max_constant_charge_current(axp20x_batt,
+							      val->intval);
+	case POWER_SUPPLY_PROP_STATUS:
+		switch (val->intval) {
+		case POWER_SUPPLY_STATUS_CHARGING:
+			return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
+				AXP20X_CHRG_CTRL1_ENABLE, AXP20X_CHRG_CTRL1_ENABLE);
+
+		case POWER_SUPPLY_STATUS_DISCHARGING:
+		case POWER_SUPPLY_STATUS_NOT_CHARGING:
+			return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
+				AXP20X_CHRG_CTRL1_ENABLE, 0);
+		}
+		fallthrough;
+	default:
+		return -EINVAL;
+	}
+}
+
+static enum power_supply_property axp20x_battery_props[] = {
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_CAPACITY,
+};
+
+static int axp20x_battery_prop_writeable(struct power_supply *psy,
+					 enum power_supply_property psp)
+{
+	return psp == POWER_SUPPLY_PROP_STATUS ||
+	       psp == POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN ||
+	       psp == POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN ||
+	       psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT ||
+	       psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;
+}
+
+static const struct power_supply_desc axp20x_batt_ps_desc = {
+	.name = "axp20x-battery",
+	.type = POWER_SUPPLY_TYPE_BATTERY,
+	.properties = axp20x_battery_props,
+	.num_properties = ARRAY_SIZE(axp20x_battery_props),
+	.property_is_writeable = axp20x_battery_prop_writeable,
+	.get_property = axp20x_battery_get_prop,
+	.set_property = axp20x_battery_set_prop,
+};
+
+static const struct axp_data axp209_data = {
+	.ccc_scale = 100000,
+	.ccc_offset = 300000,
+	.get_max_voltage = axp20x_battery_get_max_voltage,
+	.set_max_voltage = axp20x_battery_set_max_voltage,
+};
+
+static const struct axp_data axp221_data = {
+	.ccc_scale = 150000,
+	.ccc_offset = 300000,
+	.has_fg_valid = true,
+	.get_max_voltage = axp22x_battery_get_max_voltage,
+	.set_max_voltage = axp22x_battery_set_max_voltage,
+};
+
+static const struct axp_data axp813_data = {
+	.ccc_scale = 200000,
+	.ccc_offset = 200000,
+	.has_fg_valid = true,
+	.get_max_voltage = axp813_battery_get_max_voltage,
+	.set_max_voltage = axp20x_battery_set_max_voltage,
+};
+
+static const struct of_device_id axp20x_battery_ps_id[] = {
+	{
+		.compatible = "x-powers,axp209-battery-power-supply",
+		.data = (void *)&axp209_data,
+	}, {
+		.compatible = "x-powers,axp221-battery-power-supply",
+		.data = (void *)&axp221_data,
+	}, {
+		.compatible = "x-powers,axp813-battery-power-supply",
+		.data = (void *)&axp813_data,
+	}, { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, axp20x_battery_ps_id);
+
+static int axp20x_power_probe(struct platform_device *pdev)
+{
+	struct axp20x_batt_ps *axp20x_batt;
+	struct power_supply_config psy_cfg = {};
+	struct power_supply_battery_info *info;
+	struct device *dev = &pdev->dev;
+
+	if (!of_device_is_available(pdev->dev.of_node))
+		return -ENODEV;
+
+	axp20x_batt = devm_kzalloc(&pdev->dev, sizeof(*axp20x_batt),
+				   GFP_KERNEL);
+	if (!axp20x_batt)
+		return -ENOMEM;
+
+	axp20x_batt->dev = &pdev->dev;
+
+	axp20x_batt->batt_v = devm_iio_channel_get(&pdev->dev, "batt_v");
+	if (IS_ERR(axp20x_batt->batt_v)) {
+		if (PTR_ERR(axp20x_batt->batt_v) == -ENODEV)
+			return -EPROBE_DEFER;
+		return PTR_ERR(axp20x_batt->batt_v);
+	}
+
+	axp20x_batt->batt_chrg_i = devm_iio_channel_get(&pdev->dev,
+							"batt_chrg_i");
+	if (IS_ERR(axp20x_batt->batt_chrg_i)) {
+		if (PTR_ERR(axp20x_batt->batt_chrg_i) == -ENODEV)
+			return -EPROBE_DEFER;
+		return PTR_ERR(axp20x_batt->batt_chrg_i);
+	}
+
+	axp20x_batt->batt_dischrg_i = devm_iio_channel_get(&pdev->dev,
+							   "batt_dischrg_i");
+	if (IS_ERR(axp20x_batt->batt_dischrg_i)) {
+		if (PTR_ERR(axp20x_batt->batt_dischrg_i) == -ENODEV)
+			return -EPROBE_DEFER;
+		return PTR_ERR(axp20x_batt->batt_dischrg_i);
+	}
+
+	axp20x_batt->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	platform_set_drvdata(pdev, axp20x_batt);
+
+	psy_cfg.drv_data = axp20x_batt;
+	psy_cfg.of_node = pdev->dev.of_node;
+
+	axp20x_batt->data = (struct axp_data *)of_device_get_match_data(dev);
+
+	axp20x_batt->batt = devm_power_supply_register(&pdev->dev,
+						       &axp20x_batt_ps_desc,
+						       &psy_cfg);
+	if (IS_ERR(axp20x_batt->batt)) {
+		dev_err(&pdev->dev, "failed to register power supply: %ld\n",
+			PTR_ERR(axp20x_batt->batt));
+		return PTR_ERR(axp20x_batt->batt);
+	}
+
+	if (!power_supply_get_battery_info(axp20x_batt->batt, &info)) {
+		int vmin = info->voltage_min_design_uv;
+		int ccc = info->constant_charge_current_max_ua;
+
+		if (vmin > 0 && axp20x_set_voltage_min_design(axp20x_batt,
+							      vmin))
+			dev_err(&pdev->dev,
+				"couldn't set voltage_min_design\n");
+
+		/* Set max to unverified value to be able to set CCC */
+		axp20x_batt->max_ccc = ccc;
+
+		if (ccc <= 0 || axp20x_set_constant_charge_current(axp20x_batt,
+								   ccc)) {
+			dev_err(&pdev->dev,
+				"couldn't set constant charge current from DT: fallback to minimum value\n");
+			ccc = 300000;
+			axp20x_batt->max_ccc = ccc;
+			axp20x_set_constant_charge_current(axp20x_batt, ccc);
+		}
+	}
+
+	/*
+	 * Update max CCC to a valid value if battery info is present or set it
+	 * to current register value by default.
+	 */
+	axp20x_get_constant_charge_current(axp20x_batt,
+					   &axp20x_batt->max_ccc);
+
+	return 0;
+}
+
+static struct platform_driver axp20x_batt_driver = {
+	.probe    = axp20x_power_probe,
+	.driver   = {
+		.name  = "axp20x-battery-power-supply",
+		.of_match_table = axp20x_battery_ps_id,
+	},
+};
+
+module_platform_driver(axp20x_batt_driver);
+
+MODULE_DESCRIPTION("Battery power supply driver for AXP20X and AXP22X PMICs");
+MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
+MODULE_LICENSE("GPL");