[PATCH 0/7] Add support for the X-Powers AXP2101 PMIC

[PATCH 0/7] Add support for the X-Powers AXP2101 PMIC

[Olivier Louvignes]

This adds the AXP2101 to the axp20x drivers: the MFD core with its
registers and interrupts, the regulators, the USB power supply and the
battery charger. The PMIC is on the HiBy R1, a music player built on an
Ingenic X1600. It follows how the AXP717 was added: the existing
drivers are extended, and the two power supplies get their own
compatibles because their registers differ.

Not handled yet: the PMIC's own fuel gauge (the R1 uses a CW2015, and the
AXP2101's reads 0% without a battery model), the power key, the ADC
channels, the TS pin, and writing the input current limit.

Sources: there is no datasheet behind this. The register map comes from
the GPL-2.0 AXP2101 driver of the hiby-custom-kernel project
(github.com/Jepl4r/hiby-custom-kernel), an open replacement for HiBy's
closed module, and was checked against the chip on a running R1.

Tested on the R1, on v7.3 with out-of-tree board patches:
- The rails the stock firmware turns on (DCDC1-4 at 3.3, 1.1, 1.8 and
  1.2 V, ALDO2 3.3 V, ALDO3 1.1 V, ALDO4 3.3 V, BLDO1 and BLDO2 2.8 V)
  read back at their stock voltages, and the regulator registers
  0x80-0x9a stay byte for byte as the stock firmware left them. No
  voltage was changed from Linux. BLDO1 and BLDO2 (2.8 V, the LCD
  supplies) are switched on and off from Linux by the panel driver, which
  claims them: bits 4 and 5 of register 0x90 clear and set again with
  the screen blanking and unblanking, about 20 cycles over 8 boots, with
  the selectors (0x96 and 0x97) staying at 0x17. That does not change a
  voltage, since the registers already held 2.8 V. DCDC5, ALDO1, DLDO1-2
  and CPUSLDO are off on the R1 and only come from the register map.
- "poweroff -f" turns the R1 off, through COMM_CFG.
- Unplugging and replugging USB gives one VBUS_REMOVAL and one
  VBUS_PLUGIN interrupt, and the USB supply goes online 1, 0, 1.
- The charger registers read back as the stock firmware's values after
  boot, and the battery status is Full on USB, Discharging unplugged and
  Charging after a replug.

Every patch builds on 734bef548a96 (v7.3-7363) with W=1, passes
checkpatch --strict, and the three bindings pass dt_binding_check.

Open questions: whether extending the axp20x drivers is what you want
here (the alternative is a driver of its own), and whether programming
the charger from the monitored battery at probe, read-only afterwards,
is acceptable for the battery supply.

Olivier Louvignes (7):
  dt-bindings: mfd: x-powers,axp152: Add the AXP2101
  mfd: axp20x: Add support for the AXP2101
  regulator: axp20x: Add support for the AXP2101
  dt-bindings: power: supply: axp20x-usb-power: Add the AXP2101
  power: supply: axp20x_usb_power: Add support for the AXP2101
  dt-bindings: power: supply: axp20x-battery: Add the AXP2101
  power: supply: axp20x_battery: Add support for the AXP2101

 .../bindings/mfd/x-powers,axp152.yaml         |   3 +
 .../x-powers,axp20x-battery-power-supply.yaml |   1 +
 .../x-powers,axp20x-usb-power-supply.yaml     |   1 +
 drivers/mfd/axp20x-i2c.c                      |   2 +
 drivers/mfd/axp20x.c                          | 107 ++++++++-
 drivers/power/supply/axp20x_battery.c         | 221 ++++++++++++++++++
 drivers/power/supply/axp20x_usb_power.c       |  86 +++++++
 drivers/regulator/axp20x-regulator.c          |  88 +++++++
 include/linux/mfd/axp20x.h                    | 114 +++++++++
 9 files changed, 621 insertions(+), 2 deletions(-)


base-commit: 734bef548a96e8774d6eef5dfa2026c6edc4e80b
-- 
2.39.5

[PATCH 1/7] dt-bindings: mfd: x-powers,axp152: Add the AXP2101

[Olivier Louvignes]

The AXP2101's interrupt line is optional, as for the AXP313A and the
AXP15060: the driver then registers only the regulators. It has no DCDC
frequency setting.

Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
---
 Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
index 45f015d63df1..f5e2c8232581 100644
--- a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
+++ b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
@@ -68,6 +68,7 @@ allOf:
           compatible:
             contains:
               enum:
+                - x-powers,axp2101
                 - x-powers,axp15060
                 - x-powers,axp305
                 - x-powers,axp313a
@@ -84,6 +85,7 @@ allOf:
             enum:
               - x-powers,axp313a
               - x-powers,axp323
+              - x-powers,axp2101
               - x-powers,axp15060
               - x-powers,axp717
 
@@ -108,6 +110,7 @@ properties:
           - x-powers,axp806
           - x-powers,axp809
           - x-powers,axp813
+          - x-powers,axp2101
           - x-powers,axp15060
       - items:
           - const: x-powers,axp228
-- 
2.39.5

Re: [PATCH 1/7] dt-bindings: mfd: x-powers,axp152: Add the AXP2101

[Krzysztof Kozlowski]

On Fri, Oct 23, 2026 at 12:03:55PM +0200, Olivier Louvignes wrote:
> The AXP2101's interrupt line is optional, as for the AXP313A and the
> AXP15060: the driver then registers only the regulators. It has no DCDC
> frequency setting.
> 
> Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
> ---
>  Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
> index 45f015d63df1..f5e2c8232581 100644
> --- a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
> +++ b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
> @@ -68,6 +68,7 @@ allOf:
>            compatible:
>              contains:
>                enum:
> +                - x-powers,axp2101

Why breaking the order? Keep natural sorted.

>                  - x-powers,axp15060
>                  - x-powers,axp305
>                  - x-powers,axp313a
> @@ -84,6 +85,7 @@ allOf:
>              enum:
>                - x-powers,axp313a
>                - x-powers,axp323
> +              - x-powers,axp2101

Sorting is broken in original code but you placed it completely odd.
Neither keeping sorting of 3xx variants nor, between 15060 and 717.
What's the logic?

>                - x-powers,axp15060
>                - x-powers,axp717
>  
> @@ -108,6 +110,7 @@ properties:
>            - x-powers,axp806
>            - x-powers,axp809
>            - x-powers,axp813
> +          - x-powers,axp2101

Placement of these entries makes no sense.

>            - x-powers,axp15060
>        - items:
>            - const: x-powers,axp228
> -- 
> 2.39.5
> 

Re: [PATCH 1/7] dt-bindings: mfd: x-powers,axp152: Add the AXP2101

[Krzysztof Kozlowski]

On 26/10/2026 10:30, Krzysztof Kozlowski wrote:
> On Fri, Oct 23, 2026 at 12:03:55PM +0200, Olivier Louvignes wrote:
>> The AXP2101's interrupt line is optional, as for the AXP313A and the
>> AXP15060: the driver then registers only the regulators. It has no DCDC
>> frequency setting.
>>
>> Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
>> ---
>>  Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
>> index 45f015d63df1..f5e2c8232581 100644
>> --- a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
>> +++ b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
>> @@ -68,6 +68,7 @@ allOf:
>>            compatible:
>>              contains:
>>                enum:
>> +                - x-powers,axp2101
> 
> Why breaking the order? Keep natural sorted.
> 
>>                  - x-powers,axp15060
>>                  - x-powers,axp305
>>                  - x-powers,axp313a
>> @@ -84,6 +85,7 @@ allOf:
>>              enum:
>>                - x-powers,axp313a
>>                - x-powers,axp323
>> +              - x-powers,axp2101
> 
> Sorting is broken in original code but you placed it completely odd.
> Neither keeping sorting of 3xx variants nor, between 15060 and 717.
> What's the logic?
> 
>>                - x-powers,axp15060
>>                - x-powers,axp717
>>  
>> @@ -108,6 +110,7 @@ properties:
>>            - x-powers,axp806
>>            - x-powers,axp809
>>            - x-powers,axp813
>> +          - x-powers,axp2101
> 
> Placement of these entries makes no sense.

Ah, this one is actually sorted by natural sort.

Best regards,
Krzysztof

[PATCH 2/7] mfd: axp20x: Add support for the AXP2101

[Olivier Louvignes]

The AXP2101 is an X-Powers PMIC with five DC-DC converters, several
LDOs, a charger and a fuel gauge, used on the HiBy R1 among others. Add
it to the axp20x core with its register map and interrupts, and cells
for the regulators, the USB power supply and the battery charger. It
powers off through bit 0 of COMM_CFG (0x10), not AXP20X_OFF_CTRL.

There is no datasheet behind this: the register map comes from the
GPL-2.0 AXP2101 driver of the hiby-custom-kernel project
(github.com/Jepl4r/hiby-custom-kernel), an open replacement for HiBy's
closed module, and was checked against the chip's state on a running R1.

Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
---
 drivers/mfd/axp20x-i2c.c   |   2 +
 drivers/mfd/axp20x.c       | 107 +++++++++++++++++++++++++++++++++-
 include/linux/mfd/axp20x.h | 114 +++++++++++++++++++++++++++++++++++++
 3 files changed, 221 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/axp20x-i2c.c b/drivers/mfd/axp20x-i2c.c
index 5c93136f977e..c1f7bb8e3a14 100644
--- a/drivers/mfd/axp20x-i2c.c
+++ b/drivers/mfd/axp20x-i2c.c
@@ -69,6 +69,7 @@ static const struct of_device_id axp20x_i2c_of_match[] = {
 	{ .compatible = "x-powers,axp717", .data = (void *)AXP717_ID },
 	{ .compatible = "x-powers,axp803", .data = (void *)AXP803_ID },
 	{ .compatible = "x-powers,axp806", .data = (void *)AXP806_ID },
+	{ .compatible = "x-powers,axp2101", .data = (void *)AXP2101_ID },
 	{ .compatible = "x-powers,axp15060", .data = (void *)AXP15060_ID },
 	{ },
 };
@@ -86,6 +87,7 @@ static const struct i2c_device_id axp20x_i2c_id[] = {
 	{ "axp717" },
 	{ "axp803" },
 	{ "axp806" },
+	{ "axp2101" },
 	{ "axp15060" },
 	{ }
 };
diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c
index 50df66de24e0..b87d7ef5ba45 100644
--- a/drivers/mfd/axp20x.c
+++ b/drivers/mfd/axp20x.c
@@ -48,6 +48,7 @@ static const char * const axp20x_model_names[] = {
 	[AXP806_ID] = "AXP806",
 	[AXP809_ID] = "AXP809",
 	[AXP813_ID] = "AXP813",
+	[AXP2101_ID] = "AXP2101",
 	[AXP15060_ID] = "AXP15060",
 };
 
@@ -218,6 +219,34 @@ static const struct regmap_access_table axp313a_volatile_table = {
 	.n_yes_ranges = ARRAY_SIZE(axp313a_volatile_ranges),
 };
 
+static const struct regmap_range axp2101_writeable_ranges[] = {
+	regmap_reg_range(AXP2101_COMM_CFG, AXP2101_LOW_BATT_WARN),
+	regmap_reg_range(AXP2101_PWROFF_EN, AXP2101_FAST_PWRON_CTRL),
+	regmap_reg_range(AXP2101_ADC_CH_EN, AXP2101_ADC_CH_EN),
+	regmap_reg_range(AXP2101_IRQ0_EN, AXP2101_IRQ2_STATE),
+	regmap_reg_range(AXP2101_TS_PIN_CFG, AXP2101_BTN_CHG_CFG),
+	regmap_reg_range(AXP2101_DCDC_OUTPUT_CONTROL, AXP2101_DLDO2_CONTROL),
+	regmap_reg_range(AXP2101_GAUGE_CFG, AXP2101_GAUGE_CFG),
+};
+
+static const struct regmap_range axp2101_volatile_ranges[] = {
+	regmap_reg_range(AXP2101_PMU_STATUS_1, AXP2101_PMU_STATUS_2),
+	regmap_reg_range(AXP2101_PWRON_STATUS, AXP2101_PWROFF_STATUS),
+	regmap_reg_range(AXP2101_BATT_V_H, AXP2101_DIE_TEMP_L),
+	regmap_reg_range(AXP2101_IRQ0_STATE, AXP2101_IRQ2_STATE),
+	regmap_reg_range(AXP2101_BATT_PERCENT_DATA, AXP2101_TTF_L),
+};
+
+static const struct regmap_access_table axp2101_writeable_table = {
+	.yes_ranges = axp2101_writeable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(axp2101_writeable_ranges),
+};
+
+static const struct regmap_access_table axp2101_volatile_table = {
+	.yes_ranges = axp2101_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(axp2101_volatile_ranges),
+};
+
 static const struct regmap_range axp717_writeable_ranges[] = {
 	regmap_reg_range(AXP717_PMU_FAULT, AXP717_MODULE_EN_CONTROL_1),
 	regmap_reg_range(AXP717_MIN_SYS_V_CONTROL, AXP717_BOOST_CONTROL),
@@ -456,6 +485,15 @@ static const struct regmap_config axp323_regmap_config = {
 	.cache_type = REGCACHE_MAPLE,
 };
 
+static const struct regmap_config axp2101_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.wr_table = &axp2101_writeable_table,
+	.volatile_table = &axp2101_volatile_table,
+	.max_register = AXP2101_TTF_L,
+	.cache_type = REGCACHE_MAPLE,
+};
+
 static const struct regmap_config axp717_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -663,6 +701,33 @@ static const struct regmap_irq axp313a_regmap_irqs[] = {
 	INIT_REGMAP_IRQ(AXP313A, DIE_TEMP_HIGH,		0, 0),
 };
 
+static const struct regmap_irq axp2101_regmap_irqs[] = {
+	INIT_REGMAP_IRQ(AXP2101, BATT_UNDER_TEMP_WORK,	0, 0),
+	INIT_REGMAP_IRQ(AXP2101, BATT_OVER_TEMP_WORK,	0, 1),
+	INIT_REGMAP_IRQ(AXP2101, BATT_UNDER_TEMP_CHG,	0, 2),
+	INIT_REGMAP_IRQ(AXP2101, BATT_OVER_TEMP_CHG,	0, 3),
+	INIT_REGMAP_IRQ(AXP2101, GAUGE_NEW_SOC,		0, 4),
+	INIT_REGMAP_IRQ(AXP2101, GAUGE_WDOG,		0, 5),
+	INIT_REGMAP_IRQ(AXP2101, SOC_DROP_LVL1,		0, 6),
+	INIT_REGMAP_IRQ(AXP2101, SOC_DROP_LVL2,		0, 7),
+	INIT_REGMAP_IRQ(AXP2101, PEK_RIS_EDGE,		1, 0),
+	INIT_REGMAP_IRQ(AXP2101, PEK_FAL_EDGE,		1, 1),
+	INIT_REGMAP_IRQ(AXP2101, PEK_LONG,		1, 2),
+	INIT_REGMAP_IRQ(AXP2101, PEK_SHORT,		1, 3),
+	INIT_REGMAP_IRQ(AXP2101, BATT_REMOVAL,		1, 4),
+	INIT_REGMAP_IRQ(AXP2101, BATT_PLUGIN,		1, 5),
+	INIT_REGMAP_IRQ(AXP2101, VBUS_REMOVAL,		1, 6),
+	INIT_REGMAP_IRQ(AXP2101, VBUS_PLUGIN,		1, 7),
+	INIT_REGMAP_IRQ(AXP2101, BATT_OVER_V,		2, 0),
+	INIT_REGMAP_IRQ(AXP2101, CHARG_TIMER,		2, 1),
+	INIT_REGMAP_IRQ(AXP2101, DIE_TEMP_HIGH,		2, 2),
+	INIT_REGMAP_IRQ(AXP2101, CHARG,			2, 3),
+	INIT_REGMAP_IRQ(AXP2101, CHARG_DONE,		2, 4),
+	INIT_REGMAP_IRQ(AXP2101, BATT_OVER_CURR,	2, 5),
+	INIT_REGMAP_IRQ(AXP2101, LDO_OVER_CURR,		2, 6),
+	INIT_REGMAP_IRQ(AXP2101, WDOG_EXPIRE,		2, 7),
+};
+
 static const struct regmap_irq axp717_regmap_irqs[] = {
 	INIT_REGMAP_IRQ(AXP717, SOC_DROP_LVL2,		0, 7),
 	INIT_REGMAP_IRQ(AXP717, SOC_DROP_LVL1,		0, 6),
@@ -884,6 +949,17 @@ static const struct regmap_irq_chip axp313a_regmap_irq_chip = {
 	.num_regs		= 1,
 };
 
+static const struct regmap_irq_chip axp2101_regmap_irq_chip = {
+	.name			= "axp2101_irq_chip",
+	.status_base		= AXP2101_IRQ0_STATE,
+	.ack_base		= AXP2101_IRQ0_STATE,
+	.unmask_base		= AXP2101_IRQ0_EN,
+	.init_ack_masked	= true,
+	.irqs			= axp2101_regmap_irqs,
+	.num_irqs		= ARRAY_SIZE(axp2101_regmap_irqs),
+	.num_regs		= 3,
+};
+
 static const struct regmap_irq_chip axp717_regmap_irq_chip = {
 	.name			= "axp717_irq_chip",
 	.status_base		= AXP717_IRQ0_STATE,
@@ -1061,6 +1137,21 @@ static struct mfd_cell axp313a_cells[] = {
 	MFD_CELL_RES("axp313a-pek", axp313a_pek_resources),
 };
 
+static const struct resource axp2101_usb_power_supply_resources[] = {
+	DEFINE_RES_IRQ_NAMED(AXP2101_IRQ_VBUS_PLUGIN, "VBUS_PLUGIN"),
+	DEFINE_RES_IRQ_NAMED(AXP2101_IRQ_VBUS_REMOVAL, "VBUS_REMOVAL"),
+};
+
+/* No driver handles its fuel gauge yet. */
+static struct mfd_cell axp2101_cells[] = {
+	MFD_CELL_NAME("axp20x-regulator"),
+	MFD_CELL_OF("axp20x-usb-power-supply",
+		    axp2101_usb_power_supply_resources, NULL, 0, 0,
+		    "x-powers,axp2101-usb-power-supply"),
+	MFD_CELL_OF("axp20x-battery-power-supply",
+		    NULL, NULL, 0, 0, "x-powers,axp2101-battery-power-supply"),
+};
+
 static struct mfd_cell axp717_cells[] = {
 	MFD_CELL_NAME("axp20x-regulator"),
 	MFD_CELL_RES("axp20x-pek", axp717_pek_resources),
@@ -1241,19 +1332,25 @@ static const struct mfd_cell axp_regulator_only_cells[] = {
 static int axp20x_power_off(struct sys_off_data *data)
 {
 	struct axp20x_dev *axp20x = data->cb_data;
-	unsigned int shutdown_reg;
+	unsigned int shutdown_reg, shutdown_bit;
 
 	switch (axp20x->variant) {
 	case AXP323_ID:
 	case AXP313A_ID:
 		shutdown_reg = AXP313A_SHUTDOWN_CTRL;
+		shutdown_bit = AXP20X_OFF;
+		break;
+	case AXP2101_ID:
+		shutdown_reg = AXP2101_COMM_CFG;
+		shutdown_bit = AXP2101_SOFT_PWROFF;
 		break;
 	default:
 		shutdown_reg = AXP20X_OFF_CTRL;
+		shutdown_bit = AXP20X_OFF;
 		break;
 	}
 
-	regmap_set_bits(axp20x->regmap, shutdown_reg, AXP20X_OFF);
+	regmap_set_bits(axp20x->regmap, shutdown_reg, shutdown_bit);
 
 	/* Give capacitors etc. time to drain to avoid kernel panic msg. */
 	mdelay(500);
@@ -1325,6 +1422,12 @@ int axp20x_match_device(struct axp20x_dev *axp20x)
 		axp20x->regmap_cfg = &axp717_regmap_config;
 		axp20x->regmap_irq_chip = &axp717_regmap_irq_chip;
 		break;
+	case AXP2101_ID:
+		axp20x->nr_cells = ARRAY_SIZE(axp2101_cells);
+		axp20x->cells = axp2101_cells;
+		axp20x->regmap_cfg = &axp2101_regmap_config;
+		axp20x->regmap_irq_chip = &axp2101_regmap_irq_chip;
+		break;
 	case AXP803_ID:
 		axp20x->nr_cells = ARRAY_SIZE(axp803_cells);
 		axp20x->cells = axp803_cells;
diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
index b352661d99a1..21db12a4156d 100644
--- a/include/linux/mfd/axp20x.h
+++ b/include/linux/mfd/axp20x.h
@@ -25,6 +25,7 @@ enum axp20x_variants {
 	AXP806_ID,
 	AXP809_ID,
 	AXP813_ID,
+	AXP2101_ID,
 	AXP15060_ID,
 	NR_AXP20X_VARIANTS,
 };
@@ -116,6 +117,74 @@ enum axp20x_variants {
 #define AXP313A_IRQ_STATE		0x21
 #define AXP323_DCDC_MODE_CTRL2		0x22
 
+#define AXP2101_PMU_STATUS_1		0x00
+#define AXP2101_PMU_STATUS_2		0x01
+#define AXP2101_CHIP_ID			0x03
+#define AXP2101_COMM_CFG		0x10
+#define AXP2101_BATFET_CTRL		0x12
+#define AXP2101_DIE_TEMP_CTRL		0x13
+#define AXP2101_MIN_SYS_V_CTRL		0x14
+#define AXP2101_VIN_DPM			0x15
+#define AXP2101_IIN_LIM			0x16
+#define AXP2101_GAUGE_RESET		0x17
+#define AXP2101_MODULE_EN		0x18
+#define AXP2101_WDT_CTRL		0x19
+#define AXP2101_LOW_BATT_WARN		0x1a
+#define AXP2101_PWRON_STATUS		0x20
+#define AXP2101_PWROFF_STATUS		0x21
+#define AXP2101_PWROFF_EN		0x22
+#define AXP2101_DCDC_OVP_UVP		0x23
+#define AXP2101_VSYS_V_POWEROFF		0x24
+#define AXP2101_PWROK_SEQ		0x25
+#define AXP2101_SLEEP_WAKEUP		0x26
+#define AXP2101_IRQ_LEVEL_OFF_ON	0x27
+#define AXP2101_FAST_PWRON_CFG0		0x28
+#define AXP2101_FAST_PWRON_CTRL		0x2b
+#define AXP2101_ADC_CH_EN		0x30
+#define AXP2101_BATT_V_H		0x34
+#define AXP2101_DIE_TEMP_L		0x3d
+#define AXP2101_IRQ0_EN			0x40
+#define AXP2101_IRQ1_EN			0x41
+#define AXP2101_IRQ2_EN			0x42
+#define AXP2101_IRQ0_STATE		0x48
+#define AXP2101_IRQ1_STATE		0x49
+#define AXP2101_IRQ2_STATE		0x4a
+#define AXP2101_TS_PIN_CFG		0x50
+#define AXP2101_TS_HYSL2H		0x52
+#define AXP2101_JEITA_CFG		0x58
+#define AXP2101_IPRECHG_SET		0x61
+#define AXP2101_ICC_CHG_SET		0x62
+#define AXP2101_ITERM_CHG_SET		0x63
+#define AXP2101_CV_CHG_SET		0x64
+#define AXP2101_CHGLED_CFG		0x69
+#define AXP2101_BTN_CHG_CFG		0x6a
+#define AXP2101_DCDC_OUTPUT_CONTROL	0x80
+#define AXP2101_DCDC_FORCE_PWM		0x81
+#define AXP2101_DCDC1_CONTROL		0x82
+#define AXP2101_DCDC2_CONTROL		0x83
+#define AXP2101_DCDC3_CONTROL		0x84
+#define AXP2101_DCDC4_CONTROL		0x85
+#define AXP2101_DCDC5_CONTROL		0x86
+#define AXP2101_DCDC_MODE_CTRL		0x87
+#define AXP2101_LDO0_OUTPUT_CONTROL	0x90
+#define AXP2101_LDO1_OUTPUT_CONTROL	0x91
+#define AXP2101_ALDO1_CONTROL		0x92
+#define AXP2101_ALDO2_CONTROL		0x93
+#define AXP2101_ALDO3_CONTROL		0x94
+#define AXP2101_ALDO4_CONTROL		0x95
+#define AXP2101_BLDO1_CONTROL		0x96
+#define AXP2101_BLDO2_CONTROL		0x97
+#define AXP2101_CPUSLDO_CONTROL		0x98
+#define AXP2101_DLDO1_CONTROL		0x99
+#define AXP2101_DLDO2_CONTROL		0x9a
+#define AXP2101_GAUGE_CFG		0xa2
+#define AXP2101_BATT_PERCENT_DATA	0xa4
+#define AXP2101_TTE_H			0xa6
+#define AXP2101_TTF_L			0xa9
+
+/* Bit 0 of COMM_CFG powers the PMIC off. */
+#define AXP2101_SOFT_PWROFF		BIT(0)
+
 #define AXP717_ON_INDICATE		0x00
 #define AXP717_PMU_STATUS_2		0x01
 #define AXP717_BC_DETECT		0x05
@@ -498,6 +567,24 @@ enum {
 	AXP313A_REG_ID_MAX,
 };
 
+enum {
+	AXP2101_DCDC1 = 0,
+	AXP2101_DCDC2,
+	AXP2101_DCDC3,
+	AXP2101_DCDC4,
+	AXP2101_DCDC5,
+	AXP2101_ALDO1,
+	AXP2101_ALDO2,
+	AXP2101_ALDO3,
+	AXP2101_ALDO4,
+	AXP2101_BLDO1,
+	AXP2101_BLDO2,
+	AXP2101_DLDO1,
+	AXP2101_DLDO2,
+	AXP2101_CPUSLDO,
+	AXP2101_REG_ID_MAX,
+};
+
 enum {
 	AXP717_DCDC1 = 0,
 	AXP717_DCDC2,
@@ -819,6 +906,33 @@ enum axp313a_irqs {
 	AXP313A_IRQ_PEK_RIS_EDGE,
 };
 
+enum axp2101_irqs {
+	AXP2101_IRQ_BATT_UNDER_TEMP_WORK,
+	AXP2101_IRQ_BATT_OVER_TEMP_WORK,
+	AXP2101_IRQ_BATT_UNDER_TEMP_CHG,
+	AXP2101_IRQ_BATT_OVER_TEMP_CHG,
+	AXP2101_IRQ_GAUGE_NEW_SOC,
+	AXP2101_IRQ_GAUGE_WDOG,
+	AXP2101_IRQ_SOC_DROP_LVL1,
+	AXP2101_IRQ_SOC_DROP_LVL2,
+	AXP2101_IRQ_PEK_RIS_EDGE,
+	AXP2101_IRQ_PEK_FAL_EDGE,
+	AXP2101_IRQ_PEK_LONG,
+	AXP2101_IRQ_PEK_SHORT,
+	AXP2101_IRQ_BATT_REMOVAL,
+	AXP2101_IRQ_BATT_PLUGIN,
+	AXP2101_IRQ_VBUS_REMOVAL,
+	AXP2101_IRQ_VBUS_PLUGIN,
+	AXP2101_IRQ_BATT_OVER_V,
+	AXP2101_IRQ_CHARG_TIMER,
+	AXP2101_IRQ_DIE_TEMP_HIGH,
+	AXP2101_IRQ_CHARG,
+	AXP2101_IRQ_CHARG_DONE,
+	AXP2101_IRQ_BATT_OVER_CURR,
+	AXP2101_IRQ_LDO_OVER_CURR,
+	AXP2101_IRQ_WDOG_EXPIRE,
+};
+
 enum axp717_irqs {
 	AXP717_IRQ_VBUS_FAULT,
 	AXP717_IRQ_VBUS_OVER_V,
-- 
2.39.5

[PATCH 3/7] regulator: axp20x: Add support for the AXP2101

[Olivier Louvignes]

DCDC1 (1.5-3.4 V), DCDC2-4 (0.5-1.2 V by 10 mV, then 20 mV steps, DCDC3
up to 3.4 V by 100 mV), DCDC5 (1.4-3.7 V and 1.2 V), ALDO1-4 and BLDO1-2
(0.5-3.5 V), DLDO1 (0.5-3.4 V), and DLDO2 and CPUSLDO (0.5-1.4 V by 50
mV). The DCDC frequency is not known to be configurable.

On a HiBy R1 the selector values read back as the voltages the stock
firmware sets: DCDC1 3.3 V, DCDC2 1.1 V, DCDC3 1.8 V, DCDC4 1.2 V.

Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
---
 drivers/regulator/axp20x-regulator.c | 88 ++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)

diff --git a/drivers/regulator/axp20x-regulator.c b/drivers/regulator/axp20x-regulator.c
index ec6ec071ffde..42d0aec1173b 100644
--- a/drivers/regulator/axp20x-regulator.c
+++ b/drivers/regulator/axp20x-regulator.c
@@ -765,6 +765,81 @@ static const struct regulator_desc axp313a_regulators[] = {
 	AXP_DESC_FIXED(AXP313A, RTC_LDO, "rtc-ldo", "vin1", 1800),
 };
 
+static const struct linear_range axp2101_dcdc2_ranges[] = {
+	REGULATOR_LINEAR_RANGE(500000, 0, 70, 10000),
+	REGULATOR_LINEAR_RANGE(1220000, 71, 87, 20000),
+};
+
+static const struct linear_range axp2101_dcdc3_ranges[] = {
+	REGULATOR_LINEAR_RANGE(500000, 0, 70, 10000),
+	REGULATOR_LINEAR_RANGE(1220000, 71, 87, 20000),
+	REGULATOR_LINEAR_RANGE(1600000, 88, 106, 100000),
+};
+
+static const struct linear_range axp2101_dcdc4_ranges[] = {
+	REGULATOR_LINEAR_RANGE(500000, 0, 70, 10000),
+	REGULATOR_LINEAR_RANGE(1220000, 71, 102, 20000),
+};
+
+/* DCDC5 has 1.4-3.7 V in 100 mV steps, and 1.2 V on selector 25. */
+static const struct linear_range axp2101_dcdc5_ranges[] = {
+	REGULATOR_LINEAR_RANGE(1400000, 0, 23, 100000),
+	REGULATOR_LINEAR_RANGE(1200000, 25, 25, 0),
+};
+
+#define AXP2101_DCDC_V_OUT_MASK		GENMASK(6, 0)
+#define AXP2101_DCDC15_V_OUT_MASK	GENMASK(4, 0)
+#define AXP2101_LDO_V_OUT_MASK		GENMASK(4, 0)
+
+static const struct regulator_desc axp2101_regulators[] = {
+	AXP_DESC(AXP2101, DCDC1, "dcdc1", "vin1", 1500, 3400, 100,
+		 AXP2101_DCDC1_CONTROL, AXP2101_DCDC15_V_OUT_MASK,
+		 AXP2101_DCDC_OUTPUT_CONTROL, BIT(0)),
+	AXP_DESC_RANGES(AXP2101, DCDC2, "dcdc2", "vin2",
+			axp2101_dcdc2_ranges, 88,
+			AXP2101_DCDC2_CONTROL, AXP2101_DCDC_V_OUT_MASK,
+			AXP2101_DCDC_OUTPUT_CONTROL, BIT(1)),
+	AXP_DESC_RANGES(AXP2101, DCDC3, "dcdc3", "vin3",
+			axp2101_dcdc3_ranges, 107,
+			AXP2101_DCDC3_CONTROL, AXP2101_DCDC_V_OUT_MASK,
+			AXP2101_DCDC_OUTPUT_CONTROL, BIT(2)),
+	AXP_DESC_RANGES(AXP2101, DCDC4, "dcdc4", "vin4",
+			axp2101_dcdc4_ranges, 103,
+			AXP2101_DCDC4_CONTROL, AXP2101_DCDC_V_OUT_MASK,
+			AXP2101_DCDC_OUTPUT_CONTROL, BIT(3)),
+	AXP_DESC_RANGES(AXP2101, DCDC5, "dcdc5", "vin5",
+			axp2101_dcdc5_ranges, 26,
+			AXP2101_DCDC5_CONTROL, AXP2101_DCDC15_V_OUT_MASK,
+			AXP2101_DCDC_OUTPUT_CONTROL, BIT(4)),
+	AXP_DESC(AXP2101, ALDO1, "aldo1", "aldoin", 500, 3500, 100,
+		 AXP2101_ALDO1_CONTROL, AXP2101_LDO_V_OUT_MASK,
+		 AXP2101_LDO0_OUTPUT_CONTROL, BIT(0)),
+	AXP_DESC(AXP2101, ALDO2, "aldo2", "aldoin", 500, 3500, 100,
+		 AXP2101_ALDO2_CONTROL, AXP2101_LDO_V_OUT_MASK,
+		 AXP2101_LDO0_OUTPUT_CONTROL, BIT(1)),
+	AXP_DESC(AXP2101, ALDO3, "aldo3", "aldoin", 500, 3500, 100,
+		 AXP2101_ALDO3_CONTROL, AXP2101_LDO_V_OUT_MASK,
+		 AXP2101_LDO0_OUTPUT_CONTROL, BIT(2)),
+	AXP_DESC(AXP2101, ALDO4, "aldo4", "aldoin", 500, 3500, 100,
+		 AXP2101_ALDO4_CONTROL, AXP2101_LDO_V_OUT_MASK,
+		 AXP2101_LDO0_OUTPUT_CONTROL, BIT(3)),
+	AXP_DESC(AXP2101, BLDO1, "bldo1", "bldoin", 500, 3500, 100,
+		 AXP2101_BLDO1_CONTROL, AXP2101_LDO_V_OUT_MASK,
+		 AXP2101_LDO0_OUTPUT_CONTROL, BIT(4)),
+	AXP_DESC(AXP2101, BLDO2, "bldo2", "bldoin", 500, 3500, 100,
+		 AXP2101_BLDO2_CONTROL, AXP2101_LDO_V_OUT_MASK,
+		 AXP2101_LDO0_OUTPUT_CONTROL, BIT(5)),
+	AXP_DESC(AXP2101, DLDO1, "dldo1", "dldoin", 500, 3400, 100,
+		 AXP2101_DLDO1_CONTROL, AXP2101_LDO_V_OUT_MASK,
+		 AXP2101_LDO0_OUTPUT_CONTROL, BIT(7)),
+	AXP_DESC(AXP2101, DLDO2, "dldo2", "dldoin", 500, 1400, 50,
+		 AXP2101_DLDO2_CONTROL, AXP2101_LDO_V_OUT_MASK,
+		 AXP2101_LDO1_OUTPUT_CONTROL, BIT(0)),
+	AXP_DESC(AXP2101, CPUSLDO, "cpusldo", "cpusldoin", 500, 1400, 50,
+		 AXP2101_CPUSLDO_CONTROL, AXP2101_LDO_V_OUT_MASK,
+		 AXP2101_LDO0_OUTPUT_CONTROL, BIT(6)),
+};
+
 static const struct linear_range axp717_dcdc1_ranges[] = {
 	REGULATOR_LINEAR_RANGE(500000,   0, 70, 10000),
 	REGULATOR_LINEAR_RANGE(1220000, 71, 87, 20000),
@@ -1346,6 +1421,15 @@ static int axp20x_set_dcdc_freq(struct platform_device *pdev, u32 dcdcfreq)
 		def = 3000;
 		step = 150;
 		break;
+	case AXP2101_ID:
+		/* Not known to be configurable. */
+		if (dcdcfreq != 0) {
+			dev_err(&pdev->dev,
+				"DCDC frequency on this PMIC is not configurable.\n");
+			return -EINVAL;
+		}
+
+		return 0;
 	case AXP313A_ID:
 	case AXP323_ID:
 	case AXP717_ID:
@@ -1589,6 +1673,10 @@ static int axp20x_regulator_probe(struct platform_device *pdev)
 		regulators = axp717_regulators;
 		nregulators = AXP717_REG_ID_MAX;
 		break;
+	case AXP2101_ID:
+		regulators = axp2101_regulators;
+		nregulators = AXP2101_REG_ID_MAX;
+		break;
 	case AXP803_ID:
 		regulators = axp803_regulators;
 		nregulators = AXP803_REG_ID_MAX;
-- 
2.39.5

Re: [PATCH 3/7] regulator: axp20x: Add support for the AXP2101

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 391 bytes --]

On Fri, Oct 23, 2026 at 12:03:57PM +0200, Olivier Louvignes wrote:
> DCDC1 (1.5-3.4 V), DCDC2-4 (0.5-1.2 V by 10 mV, then 20 mV steps, DCDC3
> up to 3.4 V by 100 mV), DCDC5 (1.4-3.7 V and 1.2 V), ALDO1-4 and BLDO1-2
> (0.5-3.5 V), DLDO1 (0.5-3.4 V), and DLDO2 and CPUSLDO (0.5-1.4 V by 50
> mV). The DCDC frequency is not known to be configurable.

Acked-by: Mark Brown <broonie@kernel.org>

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

[PATCH 4/7] dt-bindings: power: supply: axp20x-usb-power: Add the AXP2101

[Olivier Louvignes]

The AXP2101's USB power supply reports whether VBUS is present and the
input current limit, like the AXP717's; its registers differ, so it gets
its own compatible.

Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
---
 .../bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml  | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml b/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml
index 2ec036405ae4..1c582aa5e1d0 100644
--- a/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml
+++ b/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml
@@ -25,6 +25,7 @@ properties:
           - x-powers,axp223-usb-power-supply
           - x-powers,axp717-usb-power-supply
           - x-powers,axp813-usb-power-supply
+          - x-powers,axp2101-usb-power-supply
       - items:
           - const: x-powers,axp803-usb-power-supply
           - const: x-powers,axp813-usb-power-supply
-- 
2.39.5

Re: [PATCH 4/7] dt-bindings: power: supply: axp20x-usb-power: Add the AXP2101

[Krzysztof Kozlowski]

On Fri, Oct 23, 2026 at 12:03:58PM +0200, Olivier Louvignes wrote:
> The AXP2101's USB power supply reports whether VBUS is present and the
> input current limit, like the AXP717's; its registers differ, so it gets
> its own compatible.
> 
> Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
> ---
>  .../bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml  | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml b/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml
> index 2ec036405ae4..1c582aa5e1d0 100644
> --- a/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml
> +++ b/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-usb-power-supply.yaml
> @@ -25,6 +25,7 @@ properties:
>            - x-powers,axp223-usb-power-supply
>            - x-powers,axp717-usb-power-supply
>            - x-powers,axp813-usb-power-supply
> +          - x-powers,axp2101-usb-power-supply

Missing update for constraint of input limit.

Best regards,
Krzysztof

[PATCH 5/7] power: supply: axp20x_usb_power: Add support for the AXP2101

[Olivier Louvignes]

Report whether VBUS is present (bit 5 of the first status register) and
the input current limit (100 mA to 2 A, in IIN_LIM), and update on the
VBUS plug-in and removal interrupts. Nothing is written: the AXP2101's
VBUS input needs no set-up for that.

Tested on a HiBy R1: unplugging and replugging the cable gives one
VBUS_REMOVAL and one VBUS_PLUGIN interrupt, and "online" goes 1, 0, 1.

Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
---
 drivers/power/supply/axp20x_usb_power.c | 86 +++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index e951b2b64b25..594f0492b18a 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -31,6 +31,7 @@
 #define AXP20X_PWR_STATUS_VBUS_USED	BIT(4)
 
 #define AXP717_PWR_STATUS_VBUS_GOOD	BIT(5)
+#define AXP2101_PWR_STATUS_VBUS_GOOD	BIT(5)
 
 #define AXP20X_USB_STATUS_VBUS_VALID	BIT(2)
 
@@ -172,6 +173,24 @@ static void axp717_usb_power_poll_vbus(struct work_struct *work)
 	power->old_status = val;
 }
 
+static void axp2101_usb_power_poll_vbus(struct work_struct *work)
+{
+	struct axp20x_usb_power *power =
+		container_of(work, struct axp20x_usb_power, vbus_detect.work);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(power->regmap, AXP2101_PMU_STATUS_1, &val);
+	if (ret)
+		return;
+
+	val &= AXP2101_PWR_STATUS_VBUS_GOOD;
+	if (val != power->old_status)
+		power_supply_changed(power->supply);
+
+	power->old_status = val;
+}
+
 static int axp20x_get_usb_type(struct axp20x_usb_power *power,
 			       union power_supply_propval *val)
 {
@@ -315,6 +334,42 @@ static int axp20x_usb_power_get_property(struct power_supply *psy,
 	return 0;
 }
 
+/* Input current limits of AXP2101_IIN_LIM; 6 and 7 are reserved. */
+static const int axp2101_usb_curr_lim_table[] = {
+	100000, 500000, 900000, 1000000, 1500000, 2000000,
+};
+
+static int axp2101_usb_power_get_property(struct power_supply *psy,
+					  enum power_supply_property psp,
+					  union power_supply_propval *val)
+{
+	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
+	unsigned int v;
+	int ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		ret = regmap_field_read(power->curr_lim_fld, &v);
+		if (ret)
+			return ret;
+		if (v >= ARRAY_SIZE(axp2101_usb_curr_lim_table))
+			return -EINVAL;
+		val->intval = axp2101_usb_curr_lim_table[v];
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+	case POWER_SUPPLY_PROP_PRESENT:
+		ret = regmap_read(power->regmap, AXP2101_PMU_STATUS_1, &v);
+		if (ret)
+			return ret;
+		val->intval = !!(v & AXP2101_PWR_STATUS_VBUS_GOOD);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int axp717_usb_power_get_property(struct power_supply *psy,
 	enum power_supply_property psp, union power_supply_propval *val)
 {
@@ -643,6 +698,12 @@ static enum power_supply_property axp22x_usb_power_properties[] = {
 	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 };
 
+static enum power_supply_property axp2101_usb_power_properties[] = {
+	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_PRESENT,
+};
+
 static enum power_supply_property axp717_usb_power_properties[] = {
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
@@ -682,6 +743,14 @@ static const struct power_supply_desc axp22x_usb_power_desc = {
 	.set_property = axp20x_usb_power_set_property,
 };
 
+static const struct power_supply_desc axp2101_usb_power_desc = {
+	.name = "axp20x-usb",
+	.type = POWER_SUPPLY_TYPE_USB,
+	.properties = axp2101_usb_power_properties,
+	.num_properties = ARRAY_SIZE(axp2101_usb_power_properties),
+	.get_property = axp2101_usb_power_get_property,
+};
+
 static const struct power_supply_desc axp717_usb_power_desc = {
 	.name = "axp20x-usb",
 	.type = POWER_SUPPLY_TYPE_USB,
@@ -722,6 +791,11 @@ static const char * const axp22x_irq_names[] = {
 	"VBUS_REMOVAL",
 };
 
+static const char * const axp2101_irq_names[] = {
+	"VBUS_PLUGIN",
+	"VBUS_REMOVAL",
+};
+
 static const char * const axp717_irq_names[] = {
 	"VBUS_PLUGIN",
 	"VBUS_REMOVAL",
@@ -815,6 +889,15 @@ static const struct axp_data axp223_data = {
 	.axp20x_cfg_adc_reg = axp20x_configure_adc_registers,
 };
 
+static const struct axp_data axp2101_data = {
+	.power_desc	= &axp2101_usb_power_desc,
+	.irq_names	= axp2101_irq_names,
+	.num_irq_names	= ARRAY_SIZE(axp2101_irq_names),
+	.curr_lim_fld	= REG_FIELD(AXP2101_IIN_LIM, 0, 2),
+	.vbus_needs_polling = false,
+	.axp20x_read_vbus = &axp2101_usb_power_poll_vbus,
+};
+
 static const struct axp_data axp717_data = {
 	.power_desc     = &axp717_usb_power_desc,
 	.irq_names      = axp717_irq_names,
@@ -1056,6 +1139,9 @@ static const struct of_device_id axp20x_usb_power_match[] = {
 	}, {
 		.compatible = "x-powers,axp717-usb-power-supply",
 		.data = &axp717_data,
+	}, {
+		.compatible = "x-powers,axp2101-usb-power-supply",
+		.data = &axp2101_data,
 	}, {
 		.compatible = "x-powers,axp813-usb-power-supply",
 		.data = &axp813_data,
-- 
2.39.5

[PATCH 6/7] dt-bindings: power: supply: axp20x-battery: Add the AXP2101

[Olivier Louvignes]

The AXP2101's charger is programmed from the monitored battery and its
registers differ from the other models', so it gets its own compatible.

Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
---
 .../power/supply/x-powers,axp20x-battery-power-supply.yaml       | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-battery-power-supply.yaml b/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-battery-power-supply.yaml
index a90d558e7f86..6a0a0c3f052b 100644
--- a/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-battery-power-supply.yaml
+++ b/Documentation/devicetree/bindings/power/supply/x-powers,axp20x-battery-power-supply.yaml
@@ -21,6 +21,7 @@ properties:
       - const: x-powers,axp209-battery-power-supply
       - const: x-powers,axp221-battery-power-supply
       - const: x-powers,axp717-battery-power-supply
+      - const: x-powers,axp2101-battery-power-supply
       - items:
           - const: x-powers,axp803-battery-power-supply
           - const: x-powers,axp813-battery-power-supply
-- 
2.39.5

Re: [PATCH 6/7] dt-bindings: power: supply: axp20x-battery: Add the AXP2101

[Krzysztof Kozlowski]

On Fri, Oct 23, 2026 at 12:04:00PM +0200, Olivier Louvignes wrote:
> The AXP2101's charger is programmed from the monitored battery and its
> registers differ from the other models', so it gets its own compatible.
> 
> Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
> ---
>  .../power/supply/x-powers,axp20x-battery-power-supply.yaml       | 1 +
>  1 file changed, 1 insertion(+)

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof

[PATCH 7/7] power: supply: axp20x_battery: Add support for the AXP2101

[Olivier Louvignes]

Program the AXP2101's charger from the monitored battery: the end of
charge voltage (CV_CHG_SET, 4.0 to 4.4 V), the constant charge current
(ICC_CHG_SET, 25 mA steps to 200 mA then 100 mA steps to 1 A), and the
termination and precharge currents (25 mA steps). Report whether the
battery is present, the charge state (precharge, constant current or
constant voltage charging, done, or by the current direction) and the
settings.

The supply is read-only and reports no capacity: the AXP2101's own fuel
gauge needs a battery model, and the HiBy R1 uses a CW2015 for that.

Tested on a HiBy R1: the charger registers read back as the stock
firmware's values after boot, and the status is Full on USB,
Discharging unplugged and Charging after a replug.

Signed-off-by: Olivier Louvignes <olivier@mgcrea.io>
---
 drivers/power/supply/axp20x_battery.c | 221 ++++++++++++++++++++++++++
 1 file changed, 221 insertions(+)

diff --git a/drivers/power/supply/axp20x_battery.c b/drivers/power/supply/axp20x_battery.c
index ee8701a6e907..a653ad923144 100644
--- a/drivers/power/supply/axp20x_battery.c
+++ b/drivers/power/supply/axp20x_battery.c
@@ -91,6 +91,26 @@
 
 #define AXP717_TS_PIN_DISABLE		BIT(4)
 
+#define AXP2101_PWR_OP_BATT_PRESENT	BIT(3)
+#define AXP2101_PWR_STATUS_MASK		GENMASK(6, 5)
+#define AXP2101_PWR_STATUS_BAT_STANDBY	0
+#define AXP2101_PWR_STATUS_BAT_CHRG	1
+#define AXP2101_PWR_STATUS_BAT_DISCHRG	2
+#define AXP2101_CHRG_STATE_MASK		GENMASK(2, 0)
+#define AXP2101_CHRG_STATE_TRICKLE	0
+#define AXP2101_CHRG_STATE_PRECHARGE	1
+#define AXP2101_CHRG_STATE_CC		2
+#define AXP2101_CHRG_STATE_CV		3
+#define AXP2101_CHRG_STATE_DONE		4
+/* CV_CHG_SET: end of charge voltage selector, 1 to 5 for 4.0 to 4.4 V. */
+#define AXP2101_CHRG_CV_VOLT_MASK	GENMASK(2, 0)
+#define AXP2101_ICC_MASK		GENMASK(4, 0)
+#define AXP2101_ICC_MAX_SEL		16	/* 1 A; 17 to 31 are reserved */
+#define AXP2101_ITERM_MASK		GENMASK(3, 0)
+#define AXP2101_ITERM_ENABLE		BIT(4)
+#define AXP2101_IPRECHG_MASK		GENMASK(3, 0)
+#define AXP2101_CURRENT_STEP		25000
+
 struct axp20x_batt_ps;
 
 struct axp_data {
@@ -213,6 +233,44 @@ static int axp717_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
 	}
 }
 
+/* End of charge voltages of CV_CHG_SET selectors 0 to 7; 0, 6 and 7 are reserved. */
+static const int axp2101_cv_uv[] = {
+	0, 4000000, 4100000, 4200000, 4350000, 4400000, 0, 0,
+};
+
+static int axp2101_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
+					   int *val)
+{
+	int ret, reg;
+
+	ret = regmap_read(axp20x_batt->regmap, AXP2101_CV_CHG_SET, &reg);
+	if (ret)
+		return ret;
+
+	*val = axp2101_cv_uv[reg & AXP2101_CHRG_CV_VOLT_MASK];
+	return *val ? 0 : -EINVAL;
+}
+
+static int axp2101_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
+					   int val)
+{
+	int sel;
+
+	for (sel = 0; sel < ARRAY_SIZE(axp2101_cv_uv); sel++)
+		if (axp2101_cv_uv[sel] && axp2101_cv_uv[sel] == val)
+			return regmap_update_bits(axp20x_batt->regmap,
+						  AXP2101_CV_CHG_SET,
+						  AXP2101_CHRG_CV_VOLT_MASK, sel);
+
+	return -EINVAL;
+}
+
+/* CONSTANT_CHARGE_CURRENT: 25 mA steps up to 200 mA, then 100 mA steps. */
+static int axp2101_ccc_from_sel(unsigned int sel)
+{
+	return sel <= 8 ? sel * 25000 : 200000 + (sel - 8) * 100000;
+}
+
 static int axp813_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
 					  int *val)
 {
@@ -425,6 +483,89 @@ static int axp20x_battery_get_prop(struct power_supply *psy,
 	return 0;
 }
 
+static int axp2101_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, reg;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_PRESENT:
+	case POWER_SUPPLY_PROP_ONLINE:
+		ret = regmap_read(axp20x_batt->regmap, AXP2101_PMU_STATUS_1,
+				  &reg);
+		if (ret)
+			return ret;
+
+		val->intval = !!(reg & AXP2101_PWR_OP_BATT_PRESENT);
+		return 0;
+
+	case POWER_SUPPLY_PROP_STATUS:
+		ret = regmap_read(axp20x_batt->regmap, AXP2101_PMU_STATUS_2,
+				  &reg);
+		if (ret)
+			return ret;
+
+		switch (FIELD_GET(AXP2101_CHRG_STATE_MASK, reg)) {
+		case AXP2101_CHRG_STATE_PRECHARGE:
+		case AXP2101_CHRG_STATE_CC:
+		case AXP2101_CHRG_STATE_CV:
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			return 0;
+		case AXP2101_CHRG_STATE_DONE:
+			val->intval = POWER_SUPPLY_STATUS_FULL;
+			return 0;
+		}
+
+		/* Trickle charging or not charging: by the current direction. */
+		switch (FIELD_GET(AXP2101_PWR_STATUS_MASK, reg)) {
+		case AXP2101_PWR_STATUS_BAT_STANDBY:
+			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+			return 0;
+		case AXP2101_PWR_STATUS_BAT_CHRG:
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			return 0;
+		case AXP2101_PWR_STATUS_BAT_DISCHRG:
+			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+			return 0;
+		default:
+			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+			return 0;
+		}
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+		ret = regmap_read(axp20x_batt->regmap, AXP2101_ICC_CHG_SET,
+				  &reg);
+		if (ret)
+			return ret;
+
+		val->intval = axp2101_ccc_from_sel(FIELD_GET(AXP2101_ICC_MASK,
+							     reg));
+		return 0;
+
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+		return axp2101_battery_get_max_voltage(axp20x_batt,
+						       &val->intval);
+
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		ret = regmap_read(axp20x_batt->regmap, AXP2101_ITERM_CHG_SET,
+				  &reg);
+		if (ret)
+			return ret;
+
+		if (!(reg & AXP2101_ITERM_ENABLE))
+			val->intval = 0;
+		else
+			val->intval = FIELD_GET(AXP2101_ITERM_MASK, reg) *
+				      AXP2101_CURRENT_STEP;
+		return 0;
+
+	default:
+		return -EINVAL;
+	}
+}
+
 static int axp717_battery_get_prop(struct power_supply *psy,
 				   enum power_supply_property psp,
 				   union power_supply_propval *val)
@@ -852,6 +993,15 @@ static enum power_supply_property axp20x_battery_props[] = {
 	POWER_SUPPLY_PROP_CAPACITY,
 };
 
+static enum power_supply_property axp2101_battery_props[] = {
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+};
+
 static enum power_supply_property axp717_battery_props[] = {
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_ONLINE,
@@ -895,6 +1045,15 @@ static const struct power_supply_desc axp209_batt_ps_desc = {
 	.set_property = axp20x_battery_set_prop,
 };
 
+/* Read-only: the charge settings come from the monitored battery. */
+static const struct power_supply_desc axp2101_batt_ps_desc = {
+	.name = "axp20x-battery",
+	.type = POWER_SUPPLY_TYPE_BATTERY,
+	.properties = axp2101_battery_props,
+	.num_properties = ARRAY_SIZE(axp2101_battery_props),
+	.get_property = axp2101_battery_get_prop,
+};
+
 static const struct power_supply_desc axp717_batt_ps_desc = {
 	.name = "axp20x-battery",
 	.type = POWER_SUPPLY_TYPE_BATTERY,
@@ -978,6 +1137,57 @@ static void axp209_set_battery_info(struct platform_device *pdev,
 	}
 }
 
+static int axp2101_bat_cfg_iio_channels(struct platform_device *pdev,
+					struct axp20x_batt_ps *axp_batt)
+{
+	return 0;
+}
+
+/*
+ * Programs the charger from the monitored battery: end of charge voltage,
+ * constant charge current, termination and precharge currents. What the
+ * battery doesn't give is left as it is.
+ */
+static void axp2101_set_battery_info(struct platform_device *pdev,
+				     struct axp20x_batt_ps *axp_batt,
+				     struct power_supply_battery_info *info)
+{
+	int cv = info->constant_charge_voltage_max_uv;
+	int ccc = info->constant_charge_current_max_ua;
+	int iterm = info->charge_term_current_ua;
+	int iprechg = info->precharge_current_ua;
+	unsigned int sel;
+
+	if (cv > 0 && axp2101_battery_set_max_voltage(axp_batt, cv))
+		dev_err(&pdev->dev, "unsupported charge voltage %d uV\n", cv);
+
+	if (ccc > 0) {
+		if (ccc <= 200000)
+			sel = ccc / AXP2101_CURRENT_STEP;
+		else
+			sel = min((ccc - 200000) / 100000 + 8,
+				  AXP2101_ICC_MAX_SEL);
+		axp_batt->max_ccc = axp2101_ccc_from_sel(sel);
+		regmap_update_bits(axp_batt->regmap, AXP2101_ICC_CHG_SET,
+				   AXP2101_ICC_MASK, sel);
+	}
+
+	if (iterm > 0) {
+		sel = min(iterm / AXP2101_CURRENT_STEP,
+			  (int)FIELD_MAX(AXP2101_ITERM_MASK));
+		regmap_update_bits(axp_batt->regmap, AXP2101_ITERM_CHG_SET,
+				   AXP2101_ITERM_MASK | AXP2101_ITERM_ENABLE,
+				   sel | AXP2101_ITERM_ENABLE);
+	}
+
+	if (iprechg > 0) {
+		sel = min(iprechg / AXP2101_CURRENT_STEP,
+			  (int)FIELD_MAX(AXP2101_IPRECHG_MASK));
+		regmap_update_bits(axp_batt->regmap, AXP2101_IPRECHG_SET,
+				   AXP2101_IPRECHG_MASK, sel);
+	}
+}
+
 static void axp717_set_battery_info(struct platform_device *pdev,
 				    struct axp20x_batt_ps *axp_batt,
 				    struct power_supply_battery_info *info)
@@ -1047,6 +1257,14 @@ static const struct axp_data axp221_data = {
 	.set_bat_info = axp209_set_battery_info,
 };
 
+static const struct axp_data axp2101_data = {
+	.bat_ps_desc = &axp2101_batt_ps_desc,
+	.get_max_voltage = axp2101_battery_get_max_voltage,
+	.set_max_voltage = axp2101_battery_set_max_voltage,
+	.cfg_iio_chan = axp2101_bat_cfg_iio_channels,
+	.set_bat_info = axp2101_set_battery_info,
+};
+
 static const struct axp_data axp717_data = {
 	.ccc_scale = 64000,
 	.ccc_offset = 0,
@@ -1082,6 +1300,9 @@ static const struct of_device_id axp20x_battery_ps_id[] = {
 	}, {
 		.compatible = "x-powers,axp717-battery-power-supply",
 		.data = (void *)&axp717_data,
+	}, {
+		.compatible = "x-powers,axp2101-battery-power-supply",
+		.data = (void *)&axp2101_data,
 	}, {
 		.compatible = "x-powers,axp813-battery-power-supply",
 		.data = (void *)&axp813_data,
-- 
2.39.5