[PATCH v3 0/4] regulator: qcom_usb_vbus: add pm4125 VBUS regulator support

[PATCH v3 0/4] regulator: qcom_usb_vbus: add pm4125 VBUS regulator support

[Rakesh Kota]

Add support for PM4125 USB VBUS regulator. Unlike PM8150B which uses
a current-limit selector, PM4125 uses a 2-bit VBOOST voltage selector
supporting 4.25 V, 4.5 V, 4.75 V and 5.0 V output.

Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
---
Changes in v3:
- Updates the Vbus voltage min/max to 5V as per Konrad's and Dmitry suggestions.
- Split the Driver change into two part as per the Bryan O'Donoghue suggestions.
     - Patch 1: Add register abstraction logic + PM8150B support
     - Patch 2: Add PM4125 compatible
- Dropped Konrad's and Dmitry Reviewed-by tags on the Drivers change as I've split it into two patches.
- Link to v2: https://lore.kernel.org/r/20260701-add_pm4125-vbus-reg-v2-0-6bac2bac7131@oss.qualcomm.com

Changes in v2:
- Fix the registers name and unit-address as per Konrad's suggestions.
- Use microvolt instead of microamp for qrb2210.
- Link to v1: https://lore.kernel.org/r/20260520-add_pm4125-vbus-reg-v1-0-f6d15d7dbbe8@oss.qualcomm.com

---
Rakesh Kota (4):
      dt-bindings: regulator: qcom,usb-vbus-regulator: add qcom,pm4125-vbus-reg
      regulator: qcom_usb_vbus: add register abstraction and PM8150B support
      regulator: qcom_usb_vbus: add support for qcom,pm4125-vbus-reg
      arm64: dts: qcom: Fix pm4125 vbus regulator compatible and constraints

 .../regulator/qcom,usb-vbus-regulator.yaml         |  50 +++++++++-
 arch/arm64/boot/dts/qcom/pm4125.dtsi               |   2 +-
 arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts |   4 +-
 arch/arm64/boot/dts/qcom/qrb2210-rb1.dts           |   4 +-
 drivers/regulator/qcom_usb_vbus-regulator.c        | 102 ++++++++++++++++++---
 5 files changed, 138 insertions(+), 24 deletions(-)
---
base-commit: be5c93fa674f0fc3c8f359c2143abce6bbb422e6
change-id: 20260520-add_pm4125-vbus-reg-95c858c6ae43

Best regards,
-- 
Rakesh Kota <rakesh.kota@oss.qualcomm.com>

[PATCH v3 1/4] dt-bindings: regulator: qcom,usb-vbus-regulator: add qcom,pm4125-vbus-reg

[Rakesh Kota]

The pm4125 PMIC uses a different USB VBUS register layout than pm8150b.
It uses a 2-bit VBOOST voltage selector supporting output voltages of
4.25 V, 4.5 V, 4.75 V and 5.0 V, instead of a current-limit selector.

Move qcom,pm4125-vbus-reg from the pm8150b fallback items list into the
standalone enum since the driver handles it with its own match-data and
register layout.

Make regulator-min/max-microamp conditional so they are only required
for current-limit variants (pm8150b, pm6150, pm7250b, pmi632). Add an
if/then condition for qcom,pm4125-vbus-reg requiring regulator-min/
max-microvolt instead, and update the pm4125 example accordingly.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
---
 .../regulator/qcom,usb-vbus-regulator.yaml         | 50 +++++++++++++++++++---
 1 file changed, 45 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/regulator/qcom,usb-vbus-regulator.yaml b/Documentation/devicetree/bindings/regulator/qcom,usb-vbus-regulator.yaml
index fcefc722ee2a495837fedba026669de97350c566..024b34d0eb1a694b9e0ff530a35f787582caa425 100644
--- a/Documentation/devicetree/bindings/regulator/qcom,usb-vbus-regulator.yaml
+++ b/Documentation/devicetree/bindings/regulator/qcom,usb-vbus-regulator.yaml
@@ -14,17 +14,21 @@ description: |
   regulator will be enabled in situations where the device is required to
   provide power to the connected peripheral.
 
-allOf:
-  - $ref: regulator.yaml#
+  The pm8150b variant uses an OTG current-limit selector, supporting limits
+  of 500 mA, 1000 mA, 1500 mA, 2000 mA, 2500 mA and 3000 mA.
+
+  The pm4125 variant uses a different register layout with a 2-bit VBOOST
+  voltage selector supporting output voltages of 4.25 V, 4.5 V, 4.75 V
+  and 5.0 V.
 
 properties:
   compatible:
     oneOf:
       - enum:
           - qcom,pm8150b-vbus-reg
+          - qcom,pm4125-vbus-reg
       - items:
           - enum:
-              - qcom,pm4125-vbus-reg
               - qcom,pm6150-vbus-reg
               - qcom,pm7250b-vbus-reg
               - qcom,pmi632-vbus-reg
@@ -34,11 +38,35 @@ properties:
     maxItems: 1
     description: VBUS output base address
 
+allOf:
+  - $ref: regulator.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,pm8150b-vbus-reg
+              - qcom,pm6150-vbus-reg
+              - qcom,pm7250b-vbus-reg
+              - qcom,pmi632-vbus-reg
+    then:
+      required:
+        - regulator-min-microamp
+        - regulator-max-microamp
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: qcom,pm4125-vbus-reg
+    then:
+      required:
+        - regulator-min-microvolt
+        - regulator-max-microvolt
+
 required:
   - compatible
   - reg
-  - regulator-min-microamp
-  - regulator-max-microamp
 
 unevaluatedProperties: false
 
@@ -55,4 +83,16 @@ examples:
             regulator-max-microamp = <3000000>;
         };
      };
+  - |
+     pmic {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        usb-vbus-regulator@1100 {
+            compatible = "qcom,pm4125-vbus-reg";
+            reg = <0x1100>;
+            regulator-min-microvolt = <4250000>;
+            regulator-max-microvolt = <5000000>;
+        };
+     };
 ...

-- 
2.34.1

Re: [PATCH v3 1/4] dt-bindings: regulator: qcom,usb-vbus-regulator: add qcom,pm4125-vbus-reg

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 610 bytes --]

On Mon, Jul 06, 2026 at 06:01:05PM +0530, Rakesh Kota wrote:
> The pm4125 PMIC uses a different USB VBUS register layout than pm8150b.
> It uses a 2-bit VBOOST voltage selector supporting output voltages of
> 4.25 V, 4.5 V, 4.75 V and 5.0 V, instead of a current-limit selector.

Please submit patches using subject lines reflecting the style for the
subsystem, this makes it easier for people to identify relevant patches.
Look at what existing commits in the area you're changing are doing and
make sure your subject lines visually resemble what they're doing.
There's no need to resubmit to fix this alone.

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[PATCH v3 2/4] regulator: qcom_usb_vbus: add register abstraction and PM8150B support

[Rakesh Kota]

Introduce per-compatible regulator descriptor data via struct
qcom_usb_vbus_reg_data to abstract register layout differences between
PMICs. This allows the probe function to dynamically populate the
regulator_desc fields rather than relying on compile-time constants.

Refactor the existing PM8150B support to use this abstraction, wiring in
its CMD_OTG, OTG_CFG, and current-limit registers through pm8150b_data.
No functional change is intended for PM8150B.

Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
---
 drivers/regulator/qcom_usb_vbus-regulator.c | 71 +++++++++++++++++++++++------
 1 file changed, 57 insertions(+), 14 deletions(-)

diff --git a/drivers/regulator/qcom_usb_vbus-regulator.c b/drivers/regulator/qcom_usb_vbus-regulator.c
index cd94ed67621fee9f6d7a0327054db0ebab6cc7ee..0201a3983981eec1f475d4b8cdccc9148b5e3b2e 100644
--- a/drivers/regulator/qcom_usb_vbus-regulator.c
+++ b/drivers/regulator/qcom_usb_vbus-regulator.c
@@ -20,6 +20,21 @@
 #define OTG_CFG				0x53
 #define OTG_EN_SRC_CFG			BIT(1)
 
+struct qcom_usb_vbus_reg_data {
+	u16 cmd_otg;
+	u16 otg_cfg;
+	u8  otg_en_src_cfg;
+	u16 csel_reg;
+	u8 csel_mask;
+	const unsigned int *curr_table;
+	unsigned int n_current_limits;
+	u16 vsel_reg;
+	u8 vsel_mask;
+	const unsigned int *volt_table;
+	unsigned int n_voltages;
+	const struct regulator_ops *ops;
+};
+
 static const unsigned int curr_table[] = {
 	500000, 1000000, 1500000, 2000000, 2500000, 3000000,
 };
@@ -32,19 +47,23 @@ static const struct regulator_ops qcom_usb_vbus_reg_ops = {
 	.set_current_limit = regulator_set_current_limit_regmap,
 };
 
-static struct regulator_desc qcom_usb_vbus_rdesc = {
-	.name = "usb_vbus",
-	.ops = &qcom_usb_vbus_reg_ops,
-	.owner = THIS_MODULE,
-	.type = REGULATOR_VOLTAGE,
+static const struct qcom_usb_vbus_reg_data pm8150b_data = {
+	.cmd_otg = CMD_OTG,
+	.otg_cfg = OTG_CFG,
+	.otg_en_src_cfg = OTG_EN_SRC_CFG,
+	.csel_reg = OTG_CURRENT_LIMIT_CFG,
+	.csel_mask = OTG_CURRENT_LIMIT_MASK,
 	.curr_table = curr_table,
 	.n_current_limits = ARRAY_SIZE(curr_table),
+	.ops = &qcom_usb_vbus_reg_ops,
 };
 
 static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	const struct qcom_usb_vbus_reg_data *data;
 	struct regulator_dev *rdev;
+	struct regulator_desc *rdesc;
 	struct regmap *regmap;
 	struct regulator_config config = { };
 	struct regulator_init_data *init_data;
@@ -57,27 +76,51 @@ static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	data = of_device_get_match_data(dev);
+	if (!data)
+		return -EINVAL;
+
 	regmap = dev_get_regmap(dev->parent, NULL);
 	if (!regmap) {
 		dev_err(dev, "Failed to get regmap\n");
 		return -ENOENT;
 	}
 
-	init_data = of_get_regulator_init_data(dev, dev->of_node,
-					       &qcom_usb_vbus_rdesc);
+	rdesc = devm_kzalloc(dev, sizeof(*rdesc), GFP_KERNEL);
+	if (!rdesc)
+		return -ENOMEM;
+
+	rdesc->name = "usb_vbus";
+	rdesc->ops = data->ops;
+	rdesc->owner = THIS_MODULE;
+	rdesc->type = REGULATOR_VOLTAGE;
+	rdesc->enable_reg = base + data->cmd_otg;
+	rdesc->enable_mask = OTG_EN;
+
+	if (data->curr_table) {
+		rdesc->curr_table = data->curr_table;
+		rdesc->n_current_limits = data->n_current_limits;
+		rdesc->csel_reg = base + data->csel_reg;
+		rdesc->csel_mask = data->csel_mask;
+	}
+
+	if (data->volt_table) {
+		rdesc->volt_table = data->volt_table;
+		rdesc->n_voltages = data->n_voltages;
+		rdesc->vsel_reg = base + data->vsel_reg;
+		rdesc->vsel_mask = data->vsel_mask;
+	}
+
+	init_data = of_get_regulator_init_data(dev, dev->of_node, rdesc);
 	if (!init_data)
 		return -ENOMEM;
 
-	qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
-	qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
-	qcom_usb_vbus_rdesc.csel_reg = base + OTG_CURRENT_LIMIT_CFG;
-	qcom_usb_vbus_rdesc.csel_mask = OTG_CURRENT_LIMIT_MASK;
 	config.dev = dev;
 	config.init_data = init_data;
 	config.of_node = dev->of_node;
 	config.regmap = regmap;
 
-	rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
+	rdev = devm_regulator_register(dev, rdesc, &config);
 	if (IS_ERR(rdev)) {
 		ret = PTR_ERR(rdev);
 		dev_err(dev, "not able to register vbus reg %d\n", ret);
@@ -85,13 +128,13 @@ static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
 	}
 
 	/* Disable HW logic for VBUS enable */
-	regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
+	regmap_update_bits(regmap, base + data->otg_cfg, data->otg_en_src_cfg, 0);
 
 	return 0;
 }
 
 static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
-	{ .compatible = "qcom,pm8150b-vbus-reg" },
+	{ .compatible = "qcom,pm8150b-vbus-reg", .data = &pm8150b_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);

-- 
2.34.1

Re: [PATCH v3 2/4] regulator: qcom_usb_vbus: add register abstraction and PM8150B support

[Bryan O'Donoghue]

On 06/07/2026 13:31, Rakesh Kota wrote:
> Introduce per-compatible regulator descriptor data via struct
> qcom_usb_vbus_reg_data to abstract register layout differences between
> PMICs. This allows the probe function to dynamically populate the
> regulator_desc fields rather than relying on compile-time constants.
> 
> Refactor the existing PM8150B support to use this abstraction, wiring in
> its CMD_OTG, OTG_CFG, and current-limit registers through pm8150b_data.
> No functional change is intended for PM8150B.
> 
> Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
> ---
>   drivers/regulator/qcom_usb_vbus-regulator.c | 71 +++++++++++++++++++++++------
>   1 file changed, 57 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/regulator/qcom_usb_vbus-regulator.c b/drivers/regulator/qcom_usb_vbus-regulator.c
> index cd94ed67621fee9f6d7a0327054db0ebab6cc7ee..0201a3983981eec1f475d4b8cdccc9148b5e3b2e 100644
> --- a/drivers/regulator/qcom_usb_vbus-regulator.c
> +++ b/drivers/regulator/qcom_usb_vbus-regulator.c
> @@ -20,6 +20,21 @@
>   #define OTG_CFG				0x53
>   #define OTG_EN_SRC_CFG			BIT(1)
> 
> +struct qcom_usb_vbus_reg_data {
> +	u16 cmd_otg;
> +	u16 otg_cfg;
> +	u8  otg_en_src_cfg;
> +	u16 csel_reg;
> +	u8 csel_mask;
> +	const unsigned int *curr_table;
> +	unsigned int n_current_limits;
> +	u16 vsel_reg;
> +	u8 vsel_mask;
> +	const unsigned int *volt_table;
> +	unsigned int n_voltages;
> +	const struct regulator_ops *ops;
> +};
> +
>   static const unsigned int curr_table[] = {
>   	500000, 1000000, 1500000, 2000000, 2500000, 3000000,
>   };
> @@ -32,19 +47,23 @@ static const struct regulator_ops qcom_usb_vbus_reg_ops = {
>   	.set_current_limit = regulator_set_current_limit_regmap,
>   };
> 
> -static struct regulator_desc qcom_usb_vbus_rdesc = {
> -	.name = "usb_vbus",
> -	.ops = &qcom_usb_vbus_reg_ops,
> -	.owner = THIS_MODULE,
> -	.type = REGULATOR_VOLTAGE,
> +static const struct qcom_usb_vbus_reg_data pm8150b_data = {
> +	.cmd_otg = CMD_OTG,
> +	.otg_cfg = OTG_CFG,
> +	.otg_en_src_cfg = OTG_EN_SRC_CFG,
> +	.csel_reg = OTG_CURRENT_LIMIT_CFG,
> +	.csel_mask = OTG_CURRENT_LIMIT_MASK,
>   	.curr_table = curr_table,
>   	.n_current_limits = ARRAY_SIZE(curr_table),
> +	.ops = &qcom_usb_vbus_reg_ops,
>   };
> 
>   static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
> +	const struct qcom_usb_vbus_reg_data *data;
>   	struct regulator_dev *rdev;
> +	struct regulator_desc *rdesc;
>   	struct regmap *regmap;
>   	struct regulator_config config = { };
>   	struct regulator_init_data *init_data;
> @@ -57,27 +76,51 @@ static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
>   		return ret;
>   	}
> 
> +	data = of_device_get_match_data(dev);
> +	if (!data)
> +		return -EINVAL;
> +
>   	regmap = dev_get_regmap(dev->parent, NULL);
>   	if (!regmap) {
>   		dev_err(dev, "Failed to get regmap\n");
>   		return -ENOENT;
>   	}
> 
> -	init_data = of_get_regulator_init_data(dev, dev->of_node,
> -					       &qcom_usb_vbus_rdesc);
> +	rdesc = devm_kzalloc(dev, sizeof(*rdesc), GFP_KERNEL);
> +	if (!rdesc)
> +		return -ENOMEM;
> +
> +	rdesc->name = "usb_vbus";
> +	rdesc->ops = data->ops;
> +	rdesc->owner = THIS_MODULE;
> +	rdesc->type = REGULATOR_VOLTAGE;
> +	rdesc->enable_reg = base + data->cmd_otg;
> +	rdesc->enable_mask = OTG_EN;
> +
> +	if (data->curr_table) {
> +		rdesc->curr_table = data->curr_table;
> +		rdesc->n_current_limits = data->n_current_limits;
> +		rdesc->csel_reg = base + data->csel_reg;
> +		rdesc->csel_mask = data->csel_mask;
> +	}
> +
> +	if (data->volt_table) {
> +		rdesc->volt_table = data->volt_table;
> +		rdesc->n_voltages = data->n_voltages;
> +		rdesc->vsel_reg = base + data->vsel_reg;
> +		rdesc->vsel_mask = data->vsel_mask;
> +	}
> +
> +	init_data = of_get_regulator_init_data(dev, dev->of_node, rdesc);
>   	if (!init_data)
>   		return -ENOMEM;
> 
> -	qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
> -	qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
> -	qcom_usb_vbus_rdesc.csel_reg = base + OTG_CURRENT_LIMIT_CFG;
> -	qcom_usb_vbus_rdesc.csel_mask = OTG_CURRENT_LIMIT_MASK;
>   	config.dev = dev;
>   	config.init_data = init_data;
>   	config.of_node = dev->of_node;
>   	config.regmap = regmap;
> 
> -	rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
> +	rdev = devm_regulator_register(dev, rdesc, &config);
>   	if (IS_ERR(rdev)) {
>   		ret = PTR_ERR(rdev);
>   		dev_err(dev, "not able to register vbus reg %d\n", ret);
> @@ -85,13 +128,13 @@ static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
>   	}
> 
>   	/* Disable HW logic for VBUS enable */
> -	regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
> +	regmap_update_bits(regmap, base + data->otg_cfg, data->otg_en_src_cfg, 0);
> 
>   	return 0;
>   }
> 
>   static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
> -	{ .compatible = "qcom,pm8150b-vbus-reg" },
> +	{ .compatible = "qcom,pm8150b-vbus-reg", .data = &pm8150b_data },
>   	{ }
>   };
>   MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
> 
> --
> 2.34.1
> 

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

Re: [PATCH v3 2/4] regulator: qcom_usb_vbus: add register abstraction and PM8150B support

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 613 bytes --]

On Mon, Jul 06, 2026 at 02:45:26PM +0100, Bryan O'Donoghue wrote:
> On 06/07/2026 13:31, Rakesh Kota wrote:
> > Introduce per-compatible regulator descriptor data via struct
> > qcom_usb_vbus_reg_data to abstract register layout differences between
> > PMICs. This allows the probe function to dynamically populate the
> > regulator_desc fields rather than relying on compile-time constants.


Please delete unneeded context from mails when replying.  Doing this
makes it much easier to find your reply in the message, helping ensure
it won't be missed by people scrolling through the irrelevant quoted
material.

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Re: [PATCH v3 2/4] regulator: qcom_usb_vbus: add register abstraction and PM8150B support

[Dmitry Baryshkov]

On Mon, Jul 06, 2026 at 06:01:06PM +0530, Rakesh Kota wrote:
> Introduce per-compatible regulator descriptor data via struct
> qcom_usb_vbus_reg_data to abstract register layout differences between
> PMICs. This allows the probe function to dynamically populate the
> regulator_desc fields rather than relying on compile-time constants.
> 
> Refactor the existing PM8150B support to use this abstraction, wiring in
> its CMD_OTG, OTG_CFG, and current-limit registers through pm8150b_data.
> No functional change is intended for PM8150B.
> 
> Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
> ---
>  drivers/regulator/qcom_usb_vbus-regulator.c | 71 +++++++++++++++++++++++------
>  1 file changed, 57 insertions(+), 14 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>


-- 
With best wishes
Dmitry

[PATCH v3 3/4] regulator: qcom_usb_vbus: add support for qcom,pm4125-vbus-reg

[Rakesh Kota]

The PM4125 PMIC uses a different register layout for USB VBUS control
compared to PM8150B. On PM4125, CMD_OTG is at offset 0x50, OTG_CFG is
at 0x56, and offset 0x52 is a 2-bit VBOOST voltage selector rather than
a current-limit selector.

Add pm4125_data using the abstraction introduced for PM8150B, along with
dedicated voltage-selector ops and the pm4125_vboost_table covering the
four supported boost voltages: 4.25 V, 4.5 V, 4.75 V, and 5.0 V.

Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
---
 drivers/regulator/qcom_usb_vbus-regulator.c | 31 +++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/regulator/qcom_usb_vbus-regulator.c b/drivers/regulator/qcom_usb_vbus-regulator.c
index 0201a3983981eec1f475d4b8cdccc9148b5e3b2e..9aea68876284e55427d03f667c9428af0ebb53d2 100644
--- a/drivers/regulator/qcom_usb_vbus-regulator.c
+++ b/drivers/regulator/qcom_usb_vbus-regulator.c
@@ -20,6 +20,12 @@
 #define OTG_CFG				0x53
 #define OTG_EN_SRC_CFG			BIT(1)
 
+#define PM4125_VBOOST_EN		0x50
+#define PM4125_VBOOST_SEL		0x52
+#define PM4125_VBOOST_CFG_MASK		GENMASK(1, 0)
+#define PM4125_VBOOST_CFG		0x56
+#define PM4125_VBOOST_EN_SRC_CFG	BIT(0)
+
 struct qcom_usb_vbus_reg_data {
 	u16 cmd_otg;
 	u16 otg_cfg;
@@ -39,6 +45,10 @@ static const unsigned int curr_table[] = {
 	500000, 1000000, 1500000, 2000000, 2500000, 3000000,
 };
 
+static const unsigned int pm4125_vboost_table[] = {
+	4250000, 4500000, 4750000, 5000000,
+};
+
 static const struct regulator_ops qcom_usb_vbus_reg_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
@@ -58,6 +68,26 @@ static const struct qcom_usb_vbus_reg_data pm8150b_data = {
 	.ops = &qcom_usb_vbus_reg_ops,
 };
 
+static const struct regulator_ops qcom_usb_vbus_pm4125_reg_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.list_voltage = regulator_list_voltage_table,
+};
+
+static const struct qcom_usb_vbus_reg_data pm4125_data = {
+	.cmd_otg = PM4125_VBOOST_EN,
+	.otg_cfg = PM4125_VBOOST_CFG,
+	.otg_en_src_cfg = PM4125_VBOOST_EN_SRC_CFG,
+	.vsel_reg = PM4125_VBOOST_SEL,
+	.vsel_mask = PM4125_VBOOST_CFG_MASK,
+	.volt_table = pm4125_vboost_table,
+	.n_voltages = ARRAY_SIZE(pm4125_vboost_table),
+	.ops = &qcom_usb_vbus_pm4125_reg_ops,
+};
+
 static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -135,6 +165,7 @@ static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
 
 static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
 	{ .compatible = "qcom,pm8150b-vbus-reg", .data = &pm8150b_data },
+	{ .compatible = "qcom,pm4125-vbus-reg",  .data = &pm4125_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);

-- 
2.34.1

Re: [PATCH v3 3/4] regulator: qcom_usb_vbus: add support for qcom,pm4125-vbus-reg

[Bryan O'Donoghue]

On 06/07/2026 13:31, Rakesh Kota wrote:
> The PM4125 PMIC uses a different register layout for USB VBUS control
> compared to PM8150B. On PM4125, CMD_OTG is at offset 0x50, OTG_CFG is
> at 0x56, and offset 0x52 is a 2-bit VBOOST voltage selector rather than
> a current-limit selector.
> 
> Add pm4125_data using the abstraction introduced for PM8150B, along with
> dedicated voltage-selector ops and the pm4125_vboost_table covering the
> four supported boost voltages: 4.25 V, 4.5 V, 4.75 V, and 5.0 V.
> 
> Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
LGTM

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

---
bod

Re: [PATCH v3 3/4] regulator: qcom_usb_vbus: add support for qcom,pm4125-vbus-reg

[Dmitry Baryshkov]

On Mon, Jul 06, 2026 at 06:01:07PM +0530, Rakesh Kota wrote:
> The PM4125 PMIC uses a different register layout for USB VBUS control
> compared to PM8150B. On PM4125, CMD_OTG is at offset 0x50, OTG_CFG is
> at 0x56, and offset 0x52 is a 2-bit VBOOST voltage selector rather than
> a current-limit selector.
> 
> Add pm4125_data using the abstraction introduced for PM8150B, along with
> dedicated voltage-selector ops and the pm4125_vboost_table covering the
> four supported boost voltages: 4.25 V, 4.5 V, 4.75 V, and 5.0 V.
> 
> Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
> ---
>  drivers/regulator/qcom_usb_vbus-regulator.c | 31 +++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>


-- 
With best wishes
Dmitry

Re: [PATCH v3 3/4] regulator: qcom_usb_vbus: add support for qcom,pm4125-vbus-reg

[Konrad Dybcio]

On 7/6/26 2:31 PM, Rakesh Kota wrote:
> The PM4125 PMIC uses a different register layout for USB VBUS control
> compared to PM8150B. On PM4125, CMD_OTG is at offset 0x50, OTG_CFG is
> at 0x56, and offset 0x52 is a 2-bit VBOOST voltage selector rather than
> a current-limit selector.
> 
> Add pm4125_data using the abstraction introduced for PM8150B, along with
> dedicated voltage-selector ops and the pm4125_vboost_table covering the
> four supported boost voltages: 4.25 V, 4.5 V, 4.75 V, and 5.0 V.
> 
> Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

[PATCH v3 4/4] arm64: dts: qcom: Fix pm4125 vbus regulator compatible and constraints

[Rakesh Kota]

Remove pm8150b fallback compatible from pm4125_vbus and fix regulator
constraints in qrb2210 DTS files to use microvolt instead of
microamp.

Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/pm4125.dtsi               | 2 +-
 arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts | 4 ++--
 arch/arm64/boot/dts/qcom/qrb2210-rb1.dts           | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/pm4125.dtsi b/arch/arm64/boot/dts/qcom/pm4125.dtsi
index 542e8fe030da40dfefc7b744dcc30133fdb35e74..3dc8d667d091ceb4267081d32b7aae983fc25071 100644
--- a/arch/arm64/boot/dts/qcom/pm4125.dtsi
+++ b/arch/arm64/boot/dts/qcom/pm4125.dtsi
@@ -37,7 +37,7 @@ pm4125_resin: resin {
 		};
 
 		pm4125_vbus: usb-vbus-regulator@1100 {
-			compatible = "qcom,pm4125-vbus-reg", "qcom,pm8150b-vbus-reg";
+			compatible = "qcom,pm4125-vbus-reg";
 			reg = <0x1100>;
 			status = "disabled";
 		};
diff --git a/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts b/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts
index bf088fa9807f040f0c8f405f9111b01790b09377..c472e13fceca4eb882a59af3be9f45022a923ead 100644
--- a/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts
+++ b/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts
@@ -235,8 +235,8 @@ &mdss_dsi0_phy {
 };
 
 &pm4125_vbus {
-	regulator-min-microamp = <500000>;
-	regulator-max-microamp = <500000>;
+	regulator-min-microvolt = <5000000>;
+	regulator-max-microvolt = <5000000>;
 
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
index 4ace2d6c06ceee74ced7c8cf9b341089b689f703..bf6fb12ad9906f21408002a2360ef61e8a4684ce 100644
--- a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
+++ b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
@@ -433,8 +433,8 @@ pm4125_ss_in: endpoint {
 };
 
 &pm4125_vbus {
-	regulator-min-microamp = <500000>;
-	regulator-max-microamp = <500000>;
+	regulator-min-microvolt = <5000000>;
+	regulator-max-microvolt = <5000000>;
 	status = "okay";
 };
 

-- 
2.34.1

Re: [PATCH v3 4/4] arm64: dts: qcom: Fix pm4125 vbus regulator compatible and constraints

[Konrad Dybcio]

On 7/6/26 2:31 PM, Rakesh Kota wrote:
> Remove pm8150b fallback compatible from pm4125_vbus and fix regulator
> constraints in qrb2210 DTS files to use microvolt instead of
> microamp.
> 
> Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

Re: [PATCH v3 4/4] arm64: dts: qcom: Fix pm4125 vbus regulator compatible and constraints

[Bryan O'Donoghue]

On 06/07/2026 13:31, Rakesh Kota wrote:
> Remove pm8150b fallback compatible from pm4125_vbus and fix regulator
> constraints in qrb2210 DTS files to use microvolt instead of
> microamp.
> 
> Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
You should break this patch up at the "and"

One to remove the fallabck, one to fixup your regulator stuff.

---
bod

Re: [PATCH v3 4/4] arm64: dts: qcom: Fix pm4125 vbus regulator compatible and constraints

[Dmitry Baryshkov]

On Mon, Jul 06, 2026 at 06:01:08PM +0530, Rakesh Kota wrote:
> Remove pm8150b fallback compatible from pm4125_vbus and fix regulator
> constraints in qrb2210 DTS files to use microvolt instead of
> microamp.
> 
> Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/pm4125.dtsi               | 2 +-
>  arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts | 4 ++--
>  arch/arm64/boot/dts/qcom/qrb2210-rb1.dts           | 4 ++--
>  3 files changed, 5 insertions(+), 5 deletions(-)
> 
With or without the break:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>



-- 
With best wishes
Dmitry