* [PATCH v6 2/7] i3c: master: Add the APIs to support I3C hub
2026-03-10 6:57 [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub Lakshay Piplani
@ 2026-03-10 6:57 ` Lakshay Piplani
2026-03-10 16:50 ` Frank Li
2026-03-10 6:57 ` [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support Lakshay Piplani
` (6 subsequent siblings)
7 siblings, 1 reply; 26+ messages in thread
From: Lakshay Piplani @ 2026-03-10 6:57 UTC (permalink / raw)
To: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood
Cc: vikash.bansal, priyanka.jain, aman.kumarpandey, lakshay.piplani
From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
Add simple helpers to direct attach/detach I3C devices and
two CCC helpers to check CCC support and send CCC commands.
1) i3c_master_direct_attach_i3c_dev()
2) i3c_master_direct_detach_i3c_dev()
3) i3c_master_send_ccc_cmd()
4) i3c_master_supports_ccc_cmd()
Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
---
Changes in v6:
- Split the patch into two parts:
1) expose the existing API
2) add new APIs.
---
---
drivers/i3c/master.c | 103 +++++++++++++++++++++++++++++++++++++
include/linux/i3c/master.h | 8 +++
2 files changed, 111 insertions(+)
diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 886637757c26..255946d4622d 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1619,6 +1619,59 @@ static int i3c_master_attach_i3c_dev(struct i3c_master_controller *master,
return 0;
}
+/**
+ * i3c_master_direct_attach_i3c_dev() - attach an I3C device to a master
+ * @master: I3C master controller to attach the device to
+ * @dev: I3C device descriptor representing the device
+ *
+ * This function attaches an I3C device to its master controller once the
+ * device has a valid address on the bus. Devices without
+ * an assigned address are ignored. The master device itself is never
+ * attached through this bus.
+ *
+ * Return: 0 on success, or a negative error code if the attach operation
+ * fails in the master controller driver.
+ */
+int i3c_master_direct_attach_i3c_dev(struct i3c_master_controller *master,
+ struct i3c_dev_desc *dev)
+{
+ int ret = 0;
+
+ /*
+ * We don't attach devices to the controller until they are
+ * addressable on the bus.
+ */
+
+ if (!dev->info.static_addr && !dev->info.dyn_addr)
+ return -EINVAL;
+
+ /* Do not attach the master device itself. */
+ if (master->this != dev && master->ops->attach_i3c_dev)
+ ret = master->ops->attach_i3c_dev(dev);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(i3c_master_direct_attach_i3c_dev);
+
+/**
+ * i3c_master_direct_detach_i3c_dev - Detach an I3C device from its master
+ * @dev: I3C device descriptor to be detached
+ *
+ * This function detaches an I3C device from its master controller.
+ * It ensures that the master itself is not detached. If the device is not
+ * the master and the master controller provides a detach operation,
+ * the detach callback is invoked to perform the actual removal.
+ */
+void i3c_master_direct_detach_i3c_dev(struct i3c_dev_desc *dev)
+{
+ struct i3c_master_controller *master = i3c_dev_get_master(dev);
+
+ /* Do not detach the master device itself. */
+ if (master->this != dev && master->ops->detach_i3c_dev)
+ master->ops->detach_i3c_dev(dev);
+}
+EXPORT_SYMBOL_GPL(i3c_master_direct_detach_i3c_dev);
+
/**
* i3c_master_reattach_i3c_dev() - reattach an I3C device with a new address
* @dev: I3C device descriptor to reattach
@@ -1783,6 +1836,56 @@ i3c_master_register_new_i3c_devs(struct i3c_master_controller *master)
}
}
+/**
+ * i3c_master_supports_ccc_cmd() - check CCC command support
+ * @master: I3C master controller
+ * @cmd: CCC command to verify
+ *
+ * This function verifies whether the given I3C master controller supports
+ * the specified Common Command Code (CCC).
+ *
+ * Return: 0 if the CCC command is supported and executed successfully,
+ * -EINVAL if arguments are invalid,
+ * -EOPNOTSUPP if the master does not support CCC commands,
+ * or another negative error code from the master's operation.
+ */
+int i3c_master_supports_ccc_cmd(struct i3c_master_controller *master,
+ const struct i3c_ccc_cmd *cmd)
+{
+ if (!cmd || !master)
+ return -EINVAL;
+
+ if (!master->ops->supports_ccc_cmd)
+ return -EOPNOTSUPP;
+
+ return master->ops->supports_ccc_cmd(master, cmd);
+}
+EXPORT_SYMBOL_GPL(i3c_master_supports_ccc_cmd);
+
+/**
+ * i3c_master_send_ccc_cmd() - send a CCC command
+ * @master: I3C master controller issuing the command
+ * @cmd: CCC command to be sent
+ *
+ * This function sends a Common Command Code (CCC) command to devices on the
+ * I3C bus. It acquires the bus maintenance lock, executes the command, and
+ * then releases the lock to ensure safe access to the bus.
+ *
+ * Return: 0 on success, or a negative error code on failure.
+ */
+int i3c_master_send_ccc_cmd(struct i3c_master_controller *master,
+ struct i3c_ccc_cmd *cmd)
+{
+ int ret;
+
+ i3c_bus_maintenance_lock(&master->bus);
+ ret = i3c_master_send_ccc_cmd_locked(master, cmd);
+ i3c_bus_maintenance_unlock(&master->bus);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(i3c_master_send_ccc_cmd);
+
/**
* i3c_master_do_daa_ext() - Dynamic Address Assignment (extended version)
* @master: controller
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index aeccec171e64..c00f0918394c 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -615,6 +615,14 @@ DEFINE_FREE(i3c_master_dma_unmap_single, void *,
int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
u8 old_dyn_addr);
+int i3c_master_direct_attach_i3c_dev(struct i3c_master_controller *master,
+ struct i3c_dev_desc *dev);
+void i3c_master_direct_detach_i3c_dev(struct i3c_dev_desc *dev);
+int i3c_master_send_ccc_cmd(struct i3c_master_controller *master,
+ struct i3c_ccc_cmd *cmd);
+
+int i3c_master_supports_ccc_cmd(struct i3c_master_controller *master,
+ const struct i3c_ccc_cmd *cmd);
int i3c_master_set_info(struct i3c_master_controller *master,
const struct i3c_device_info *info);
--
2.25.1
^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v6 2/7] i3c: master: Add the APIs to support I3C hub
2026-03-10 6:57 ` [PATCH v6 2/7] i3c: master: Add " Lakshay Piplani
@ 2026-03-10 16:50 ` Frank Li
0 siblings, 0 replies; 26+ messages in thread
From: Frank Li @ 2026-03-10 16:50 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, lgirdwood, vikash.bansal,
priyanka.jain, aman.kumarpandey
On Tue, Mar 10, 2026 at 12:27:22PM +0530, Lakshay Piplani wrote:
> From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> Add simple helpers to direct attach/detach I3C devices and
> two CCC helpers to check CCC support and send CCC commands.
>
> 1) i3c_master_direct_attach_i3c_dev()
> 2) i3c_master_direct_detach_i3c_dev()
> 3) i3c_master_send_ccc_cmd()
> 4) i3c_master_supports_ccc_cmd()
Add sentense:
"Prepare to support I3C hub."
Frank
>
^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support
2026-03-10 6:57 [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub Lakshay Piplani
2026-03-10 6:57 ` [PATCH v6 2/7] i3c: master: Add " Lakshay Piplani
@ 2026-03-10 6:57 ` Lakshay Piplani
2026-03-11 6:13 ` Krzysztof Kozlowski
2026-03-10 6:57 ` [PATCH v6 4/7] mfd: p3h2x4x: Add driver for NXP P3H2x4x i3c hub and on-die regulator Lakshay Piplani
` (5 subsequent siblings)
7 siblings, 1 reply; 26+ messages in thread
From: Lakshay Piplani @ 2026-03-10 6:57 UTC (permalink / raw)
To: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood
Cc: vikash.bansal, priyanka.jain, aman.kumarpandey, lakshay.piplani
From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
Add bindings for the NXP P3H2x4x (P3H2440/P3H2441/P3H2840/P3H2841)
multiport I3C hub family. These devices connect to a host via
I3C/I2C/SMBus and allow communication with multiple downstream
peripherals.
Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
---
Changes in v6:
- Use a vendor prefix for the attributes
Changes in v5:
- Removed SW properties: cp0-ldo-microvolt,cp1-ldo-microvolt,
tp0145-ldo-microvolt, tp2367-ldo-microvolt
- Changed supply entries and its descriptions
Changes in v4:
- Fixed DT binding check warning
- Removed SW properties: ibi-enable, local-dev, and always-enable
Changes in v3:
- Added MFD (Multi-Function Device) support for I3C hub and on-die regulator
- Added Regulator supply node
Changes in v2:
- Fixed DT binding check warning
- Revised logic for parsing DTS nodes
---
---
.../devicetree/bindings/i3c/nxp,p3h2840.yaml | 209 ++++++++++++++++++
MAINTAINERS | 8 +
2 files changed, 217 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
diff --git a/Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml b/Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
new file mode 100644
index 000000000000..e592952e8164
--- /dev/null
+++ b/Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
@@ -0,0 +1,209 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2025 NXP
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i3c/nxp,p3h2840.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP P3H2X4X I3C HUB
+
+maintainers:
+ - Aman Kumar Pandey <aman.kumarpandey@nxp.com>
+ - Vikash Bansal <vikash.bansal@nxp.com>
+
+description: |
+ P3H2x4x (P3H2440/P3H2441/P3H2840/P3H2841) is a family of multiport I3C
+ hub devices that connect to:-
+ 1. A host CPU via I3C/I2C/SMBus bus on upstream side and connect to multiple
+ peripheral devices on the downstream side.
+ 2. Have two Controller Ports which can support either
+ I2C/SMBus or I3C buses and connect to a CPU, BMC or SOC.
+ 3. P3H2840/ P3H2841 are 8 port I3C hub with eight I3C/I2C Target Port.
+ 4. P3H2440/ P3H2441 are 4 port I3C hub with four I3C/I2C Target Port.
+ Target ports can be configured as I2C/SMBus, I3C or GPIO and connect to
+ peripherals.
+
+allOf:
+ - $ref: /schemas/i3c/i3c.yaml#
+
+properties:
+ compatible:
+ const: nxp,p3h2840
+
+ nxp,tp0145-pullup-ohms:
+ description:
+ Selects the pull up resistance for target Port 0/1/4/5, in ohms.
+ enum: [250, 500, 1000, 2000]
+ default: 500
+
+ nxp,tp2367-pullup-ohms:
+ description:
+ Selects the pull up resistance for target Port 2/3/6/7, in ohms.
+ enum: [250, 500, 1000, 2000]
+ default: 500
+
+ nxp,cp0-io-strength-ohms:
+ description:
+ Selects the IO drive strength for controller Port 0, in ohms.
+ enum: [20, 30, 40, 50]
+ default: 20
+
+ nxp,cp1-io-strength-ohms:
+ description:
+ Selects the IO drive strength for controller Port 1, in ohms.
+ enum: [20, 30, 40, 50]
+ default: 20
+
+ nxp,tp0145-io-strength-ohms:
+ description:
+ Selects the IO drive strength for target port 0/1/4/5, in ohms.
+ enum: [20, 30, 40, 50]
+ default: 20
+
+ nxp,tp2367-io-strength-ohms:
+ description:
+ Selects the IO drive strength for target port 2/3/6/7, in ohms.
+ enum: [20, 30, 40, 50]
+ default: 20
+
+ vcc1-supply:
+ description: Controller port 0 power supply.
+
+ vcc2-supply:
+ description: Controller port 1 power supply.
+
+ vcc3-supply:
+ description: Target port 0/1/4/5 power supply.
+
+ vcc4-supply:
+ description: Target port 2/3/6/7 power supply.
+
+ regulators:
+ type: object
+ additionalProperties: false
+
+ properties:
+ ldo-cp0:
+ type: object
+ $ref: /schemas/regulator/regulator.yaml#
+ unevaluatedProperties: false
+
+ ldo-cp1:
+ type: object
+ $ref: /schemas/regulator/regulator.yaml#
+ unevaluatedProperties: false
+
+ ldo-tpg0:
+ type: object
+ $ref: /schemas/regulator/regulator.yaml#
+ unevaluatedProperties: false
+
+ ldo-tpg1:
+ type: object
+ $ref: /schemas/regulator/regulator.yaml#
+ unevaluatedProperties: false
+
+patternProperties:
+ "^i3c@[0-7]$":
+ type: object
+ $ref: /schemas/i3c/i3c.yaml#
+ unevaluatedProperties: false
+
+ properties:
+ reg:
+ description:
+ The I3C HUB Target Port number.
+ maximum: 7
+
+ nxp,pullup-enable:
+ type: boolean
+ description:
+ Enables the on-die pull-up for Target Port.
+
+ "^(i2c|smbus)@[0-7]$":
+ type: object
+ $ref: /schemas/i2c/i2c-controller.yaml#
+ unevaluatedProperties: false
+
+ properties:
+ reg:
+ description:
+ The I3C HUB Target Port number.
+ maximum: 7
+
+ nxp,pullup-enable:
+ type: boolean
+ description:
+ Enables the on-die pull-up for Target Port.
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ i3c {
+ #address-cells = <3>;
+ #size-cells = <0>;
+
+ hub@70,236153000c2 {
+ reg = <0x70 0x236 0x3000c2>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ assigned-address = <0x50>;
+
+ nxp,tp0145-pullup-ohms = <1000>;
+ nxp,tp2367-pullup-ohms = <1000>;
+ nxp,cp0-io-strength-ohms = <50>;
+ nxp,cp1-io-strength-ohms = <50>;
+ nxp,tp0145-io-strength-ohms = <50>;
+ nxp,tp2367-io-strength-ohms = <50>;
+ vcc3-supply = <®_tpg0>;
+ vcc4-supply = <®_tpg1>;
+
+ regulators {
+ reg_cp0: ldo-cp0 {
+ regulator-name = "ldo-cp0";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ reg_cp1: ldo-cp1 {
+ regulator-name = "ldo-cp1";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ reg_tpg0: ldo-tpg0 {
+ regulator-name = "ldo-tpg0";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ reg_tpg1: ldo-tpg1 {
+ regulator-name = "ldo-tpg1";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+ };
+
+ smbus@0 {
+ reg = <0x0>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ nxp,pullup-enable;
+ };
+
+ i2c@1 {
+ reg = <0x1>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ nxp,pullup-enable;
+ };
+
+ i3c@2 {
+ reg = <0x2>;
+ #address-cells = <3>;
+ #size-cells = <0>;
+ nxp,pullup-enable;
+ };
+ };
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 55af015174a5..06b803d6f45d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19107,6 +19107,14 @@ S: Maintained
F: Documentation/devicetree/bindings/ptp/nxp,ptp-netc.yaml
F: drivers/ptp/ptp_netc.c
+NXP P3H2X4X I3C-HUB DRIVER
+M: Vikash Bansal <vikash.bansal@nxp.com>
+M: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
+L: linux-kernel@vger.kernel.org
+L: linux-i3c-owner@lists.infradead.org
+S: Maintained
+F: Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
+
NXP PF5300/PF5301/PF5302 PMIC REGULATOR DEVICE DRIVER
M: Woodrow Douglass <wdouglass@carnegierobotics.com>
S: Maintained
--
2.25.1
^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support
2026-03-10 6:57 ` [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support Lakshay Piplani
@ 2026-03-11 6:13 ` Krzysztof Kozlowski
2026-03-13 11:09 ` [EXT] " Lakshay Piplani
0 siblings, 1 reply; 26+ messages in thread
From: Krzysztof Kozlowski @ 2026-03-11 6:13 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood,
vikash.bansal, priyanka.jain, aman.kumarpandey
On Tue, Mar 10, 2026 at 12:27:23PM +0530, Lakshay Piplani wrote:
> From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> Add bindings for the NXP P3H2x4x (P3H2440/P3H2441/P3H2840/P3H2841)
> multiport I3C hub family. These devices connect to a host via
> I3C/I2C/SMBus and allow communication with multiple downstream
> peripherals.
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
>
> ---
> Changes in v6:
> - Use a vendor prefix for the attributes
Where is cover letter with links to previous versions?
>
> Changes in v5:
> - Removed SW properties: cp0-ldo-microvolt,cp1-ldo-microvolt,
> tp0145-ldo-microvolt, tp2367-ldo-microvolt
> - Changed supply entries and its descriptions
>
> Changes in v4:
> - Fixed DT binding check warning
> - Removed SW properties: ibi-enable, local-dev, and always-enable
>
> Changes in v3:
> - Added MFD (Multi-Function Device) support for I3C hub and on-die regulator
> - Added Regulator supply node
>
> Changes in v2:
> - Fixed DT binding check warning
> - Revised logic for parsing DTS nodes
> ---
> ---
> .../devicetree/bindings/i3c/nxp,p3h2840.yaml | 209 ++++++++++++++++++
> MAINTAINERS | 8 +
> 2 files changed, 217 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
>
> diff --git a/Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml b/Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
> new file mode 100644
> index 000000000000..e592952e8164
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
> @@ -0,0 +1,209 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2025 NXP
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i3c/nxp,p3h2840.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP P3H2X4X I3C HUB
> +
> +maintainers:
> + - Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> + - Vikash Bansal <vikash.bansal@nxp.com>
> +
> +description: |
> + P3H2x4x (P3H2440/P3H2441/P3H2840/P3H2841) is a family of multiport I3C
> + hub devices that connect to:-
> + 1. A host CPU via I3C/I2C/SMBus bus on upstream side and connect to multiple
> + peripheral devices on the downstream side.
> + 2. Have two Controller Ports which can support either
> + I2C/SMBus or I3C buses and connect to a CPU, BMC or SOC.
> + 3. P3H2840/ P3H2841 are 8 port I3C hub with eight I3C/I2C Target Port.
> + 4. P3H2440/ P3H2441 are 4 port I3C hub with four I3C/I2C Target Port.
> + Target ports can be configured as I2C/SMBus, I3C or GPIO and connect to
> + peripherals.
> +
> +allOf:
> + - $ref: /schemas/i3c/i3c.yaml#
> +
> +properties:
> + compatible:
> + const: nxp,p3h2840
> +
> + nxp,tp0145-pullup-ohms:
> + description:
> + Selects the pull up resistance for target Port 0/1/4/5, in ohms.
> + enum: [250, 500, 1000, 2000]
> + default: 500
> +
> + nxp,tp2367-pullup-ohms:
> + description:
> + Selects the pull up resistance for target Port 2/3/6/7, in ohms.
> + enum: [250, 500, 1000, 2000]
> + default: 500
> +
> + nxp,cp0-io-strength-ohms:
> + description:
> + Selects the IO drive strength for controller Port 0, in ohms.
> + enum: [20, 30, 40, 50]
> + default: 20
> +
> + nxp,cp1-io-strength-ohms:
> + description:
> + Selects the IO drive strength for controller Port 1, in ohms.
> + enum: [20, 30, 40, 50]
> + default: 20
> +
> + nxp,tp0145-io-strength-ohms:
> + description:
> + Selects the IO drive strength for target port 0/1/4/5, in ohms.
> + enum: [20, 30, 40, 50]
> + default: 20
> +
> + nxp,tp2367-io-strength-ohms:
> + description:
> + Selects the IO drive strength for target port 2/3/6/7, in ohms.
> + enum: [20, 30, 40, 50]
> + default: 20
> +
> + vcc1-supply:
> + description: Controller port 0 power supply.
> +
> + vcc2-supply:
> + description: Controller port 1 power supply.
> +
> + vcc3-supply:
> + description: Target port 0/1/4/5 power supply.
> +
> + vcc4-supply:
> + description: Target port 2/3/6/7 power supply.
> +
> + regulators:
> + type: object
> + additionalProperties: false
> +
> + properties:
> + ldo-cp0:
> + type: object
> + $ref: /schemas/regulator/regulator.yaml#
> + unevaluatedProperties: false
> +
> + ldo-cp1:
> + type: object
> + $ref: /schemas/regulator/regulator.yaml#
> + unevaluatedProperties: false
> +
> + ldo-tpg0:
> + type: object
> + $ref: /schemas/regulator/regulator.yaml#
> + unevaluatedProperties: false
> +
> + ldo-tpg1:
> + type: object
> + $ref: /schemas/regulator/regulator.yaml#
> + unevaluatedProperties: false
> +
> +patternProperties:
> + "^i3c@[0-7]$":
> + type: object
> + $ref: /schemas/i3c/i3c.yaml#
> + unevaluatedProperties: false
> +
> + properties:
> + reg:
> + description:
> + The I3C HUB Target Port number.
> + maximum: 7
> +
> + nxp,pullup-enable:
> + type: boolean
> + description:
> + Enables the on-die pull-up for Target Port.
> +
> + "^(i2c|smbus)@[0-7]$":
> + type: object
> + $ref: /schemas/i2c/i2c-controller.yaml#
> + unevaluatedProperties: false
> +
> + properties:
> + reg:
> + description:
> + The I3C HUB Target Port number.
> + maximum: 7
> +
> + nxp,pullup-enable:
> + type: boolean
> + description:
> + Enables the on-die pull-up for Target Port.
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + i3c {
> + #address-cells = <3>;
> + #size-cells = <0>;
> +
> + hub@70,236153000c2 {
> + reg = <0x70 0x236 0x3000c2>;
Where is the compatible?
So this wasn't checked/tested. Try yourself, remove required properties
and see if there is an error. No error, right?
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 26+ messages in thread* RE: [EXT] Re: [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support
2026-03-11 6:13 ` Krzysztof Kozlowski
@ 2026-03-13 11:09 ` Lakshay Piplani
2026-03-13 16:01 ` Krzysztof Kozlowski
0 siblings, 1 reply; 26+ messages in thread
From: Lakshay Piplani @ 2026-03-13 11:09 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: linux-kernel@vger.kernel.org, linux-i3c@lists.infradead.org,
alexandre.belloni@bootlin.com, krzk+dt@kernel.org,
robh@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org,
broonie@kernel.org, lee@kernel.org, Frank Li, lgirdwood@gmail.com,
Vikash Bansal, Priyanka Jain, Aman Kumar Pandey
> > +examples:
> > + - |
> > + i3c {
> > + #address-cells = <3>;
> > + #size-cells = <0>;
> > +
> > + hub@70,236153000c2 {
> > + reg = <0x70 0x236 0x3000c2>;
>
> Where is the compatible?
>
> So this wasn't checked/tested. Try yourself, remove required properties and
> see if there is an error. No error, right?
>
> Best regards,
> Krzysztof
Hi Krzysztof,
Thanks for pointing this out.
In this binding, compatible is not a required property by design. The P3H2x4x
hub can appear on either an I3C bus or an I2C bus. For I3C instantiations, the
device is self-discoverable via Dynamic Address Assignment (DAA) and its PID/DCR,
so, the driver does not rely on a compatible string for matching.
The compatible = "nxp,p3h2840" entry in the schema is meant only for the legacy I2C mode.
where a standard OF match is still needed. Since we did not include an I2C example in the
examples section, the compatible property does not appear there and is therefore not
required for I3C only cases.
dt_binding_check passes because the schema intentionally does not declare compatible as
required, and the examples conform to that.
Best regards,
Lakshay
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [EXT] Re: [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support
2026-03-13 11:09 ` [EXT] " Lakshay Piplani
@ 2026-03-13 16:01 ` Krzysztof Kozlowski
2026-03-17 11:34 ` Lakshay Piplani
0 siblings, 1 reply; 26+ messages in thread
From: Krzysztof Kozlowski @ 2026-03-13 16:01 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel@vger.kernel.org, linux-i3c@lists.infradead.org,
alexandre.belloni@bootlin.com, krzk+dt@kernel.org,
robh@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org,
broonie@kernel.org, lee@kernel.org, Frank Li, lgirdwood@gmail.com,
Vikash Bansal, Priyanka Jain, Aman Kumar Pandey
On 13/03/2026 12:09, Lakshay Piplani wrote:
>>> +examples:
>>> + - |
>>> + i3c {
>>> + #address-cells = <3>;
>>> + #size-cells = <0>;
>>> +
>>> + hub@70,236153000c2 {
>>> + reg = <0x70 0x236 0x3000c2>;
>>
>> Where is the compatible?
>>
>> So this wasn't checked/tested. Try yourself, remove required properties and
>> see if there is an error. No error, right?
>>
>> Best regards,
>> Krzysztof
>
> Hi Krzysztof,
>
> Thanks for pointing this out.
>
> In this binding, compatible is not a required property by design. The P3H2x4x
> hub can appear on either an I3C bus or an I2C bus. For I3C instantiations, the
> device is self-discoverable via Dynamic Address Assignment (DAA) and its PID/DCR,
> so, the driver does not rely on a compatible string for matching.
>
> The compatible = "nxp,p3h2840" entry in the schema is meant only for the legacy I2C mode.
> where a standard OF match is still needed. Since we did not include an I2C example in the
> examples section, the compatible property does not appear there and is therefore not
> required for I3C only cases.
So you just added something which was never verified/build tested.
>
> dt_binding_check passes because the schema intentionally does not declare compatible as
> required, and the examples conform to that.
Requiring compatible is kind of irrelevant, because schema would just no
match without it. IOW, has no practical effect on the schema. Lack of
"require" of compatible also therefore has no practical impact on the
schema.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 26+ messages in thread* RE: [EXT] Re: [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support
2026-03-13 16:01 ` Krzysztof Kozlowski
@ 2026-03-17 11:34 ` Lakshay Piplani
2026-03-17 11:39 ` Krzysztof Kozlowski
0 siblings, 1 reply; 26+ messages in thread
From: Lakshay Piplani @ 2026-03-17 11:34 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: linux-kernel@vger.kernel.org, linux-i3c@lists.infradead.org,
alexandre.belloni@bootlin.com, krzk+dt@kernel.org,
robh@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org,
broonie@kernel.org, lee@kernel.org, Frank Li, lgirdwood@gmail.com,
Vikash Bansal, Priyanka Jain, Aman Kumar Pandey
> -----Original Message-----
> From: Krzysztof Kozlowski <krzk@kernel.org>
> Sent: Friday, March 13, 2026 9:31 PM
> To: Lakshay Piplani <lakshay.piplani@nxp.com>
> Cc: linux-kernel@vger.kernel.org; linux-i3c@lists.infradead.org;
> alexandre.belloni@bootlin.com; krzk+dt@kernel.org; robh@kernel.org;
> conor+dt@kernel.org; devicetree@vger.kernel.org; broonie@kernel.org;
> lee@kernel.org; Frank Li <frank.li@nxp.com>; lgirdwood@gmail.com; Vikash
> Bansal <vikash.bansal@nxp.com>; Priyanka Jain <priyanka.jain@nxp.com>;
> Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Subject: Re: [EXT] Re: [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-
> hub support
>
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report
> this email' button
>
>
> On 13/03/2026 12:09, Lakshay Piplani wrote:
> >>> +examples:
> >>> + - |
> >>> + i3c {
> >>> + #address-cells = <3>;
> >>> + #size-cells = <0>;
> >>> +
> >>> + hub@70,236153000c2 {
> >>> + reg = <0x70 0x236 0x3000c2>;
> >>
> >> Where is the compatible?
> >>
> >> So this wasn't checked/tested. Try yourself, remove required
> >> properties and see if there is an error. No error, right?
> >>
> >> Best regards,
> >> Krzysztof
> >
> > Hi Krzysztof,
> >
> > Thanks for pointing this out.
> >
> > In this binding, compatible is not a required property by design. The
> > P3H2x4x hub can appear on either an I3C bus or an I2C bus. For I3C
> > instantiations, the device is self-discoverable via Dynamic Address
> > Assignment (DAA) and its PID/DCR, so, the driver does not rely on a
> compatible string for matching.
> >
> > The compatible = "nxp,p3h2840" entry in the schema is meant only for the
> legacy I2C mode.
> > where a standard OF match is still needed. Since we did not include an
> > I2C example in the examples section, the compatible property does not
> > appear there and is therefore not required for I3C only cases.
>
> So you just added something which was never verified/build tested.
>
> >
> > dt_binding_check passes because the schema intentionally does not
> > declare compatible as required, and the examples conform to that.
>
> Requiring compatible is kind of irrelevant, because schema would just no
> match without it. IOW, has no practical effect on the schema. Lack of "require"
> of compatible also therefore has no practical impact on the schema.
>
> Best regards,
> Krzysztof
Hi Krzysztof,
Thanks for the review.
To make sure I address the issue correctly, could you please suggest what specific changes you would
like to see in this dt-binding? I will update the schema accordingly and re‑run dt_binding_check to
ensure the examples and properties are properly validated.
Best regards,
Lakshay
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [EXT] Re: [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support
2026-03-17 11:34 ` Lakshay Piplani
@ 2026-03-17 11:39 ` Krzysztof Kozlowski
0 siblings, 0 replies; 26+ messages in thread
From: Krzysztof Kozlowski @ 2026-03-17 11:39 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel@vger.kernel.org, linux-i3c@lists.infradead.org,
alexandre.belloni@bootlin.com, krzk+dt@kernel.org,
robh@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org,
broonie@kernel.org, lee@kernel.org, Frank Li, lgirdwood@gmail.com,
Vikash Bansal, Priyanka Jain, Aman Kumar Pandey
On 17/03/2026 12:34, Lakshay Piplani wrote:
>> Krzysztof
>
> Hi Krzysztof,
>
> Thanks for the review.
>
> To make sure I address the issue correctly, could you please suggest what specific changes you would
> like to see in this dt-binding? I will update the schema accordingly and re‑run dt_binding_check to
> ensure the examples and properties are properly validated.
Really I thought it was obvious... I asked where is the compatible and
provided you arguments that without it this is unverifiable schema.
Solution is to add compatible.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v6 4/7] mfd: p3h2x4x: Add driver for NXP P3H2x4x i3c hub and on-die regulator
2026-03-10 6:57 [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub Lakshay Piplani
2026-03-10 6:57 ` [PATCH v6 2/7] i3c: master: Add " Lakshay Piplani
2026-03-10 6:57 ` [PATCH v6 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support Lakshay Piplani
@ 2026-03-10 6:57 ` Lakshay Piplani
2026-03-10 9:08 ` Jorge Marques
2026-03-10 16:57 ` Frank Li
2026-03-10 6:57 ` [PATCH v6 5/7] regulator: p3h2x4x: Add driver for on-die regulators in NXP P3H2x4x i3c hub Lakshay Piplani
` (4 subsequent siblings)
7 siblings, 2 replies; 26+ messages in thread
From: Lakshay Piplani @ 2026-03-10 6:57 UTC (permalink / raw)
To: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood
Cc: vikash.bansal, priyanka.jain, aman.kumarpandey, lakshay.piplani
From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
Add core MFD support for the NXP P3H2x4x (P3H2440/P3H2441/P3H2840/P3H2841)
family of multiport I3C hub devices. These devices connect to a host via
I3C/I2C/SMBus and expose multiple downstream target ports.
Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
---
Changes in v6:
- No change
Changes in v5:
- Corrected the ordering in the Makefile and Kconfig for MFD_P3H2X4X
- Updated dev_err_probe() for regmap_init failure.
- Updated module description
Changes in v4:
- Split the driver into three separate patches(mfd, regulator and I3C hub)
- Added support for NXP P3H2x4x MFD functionality
---
---
MAINTAINERS | 2 +
drivers/mfd/Kconfig | 12 ++++
drivers/mfd/Makefile | 1 +
drivers/mfd/p3h2840.c | 126 ++++++++++++++++++++++++++++++++++++
include/linux/mfd/p3h2840.h | 28 ++++++++
5 files changed, 169 insertions(+)
create mode 100644 drivers/mfd/p3h2840.c
create mode 100644 include/linux/mfd/p3h2840.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 06b803d6f45d..cc33c6c300e4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19114,6 +19114,8 @@ L: linux-kernel@vger.kernel.org
L: linux-i3c-owner@lists.infradead.org
S: Maintained
F: Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
+F: drivers/mfd/p3h2840.c
+F: include/linux/mfd/p3h2840.h
NXP PF5300/PF5301/PF5302 PMIC REGULATOR DEVICE DRIVER
M: Woodrow Douglass <wdouglass@carnegierobotics.com>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 7192c9d1d268..645a8e4e62b6 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -617,6 +617,18 @@ config MFD_MX25_TSADC
i.MX25 processors. They consist of a conversion queue for general
purpose ADC and a queue for Touchscreens.
+config MFD_P3H2X4X
+ tristate "NXP P3H2X4X I3C Hub Device"
+ depends on I3C
+ select MFD_CORE
+ select REGMAP_I3C
+ help
+ Enable Support for NXP P3H244x/P3H284x I3C HUB device using I3C/I2c
+ communication interface.
+
+ This driver provides support for I3C Hub and regulator, additional
+ drivers must be enabled in order to use the functionality of the device.
+
config MFD_PF1550
tristate "NXP PF1550 PMIC Support"
depends on I2C=y && OF
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index e75e8045c28a..aaadf50fedf4 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -122,6 +122,7 @@ obj-$(CONFIG_MFD_MC13XXX) += mc13xxx-core.o
obj-$(CONFIG_MFD_MC13XXX_SPI) += mc13xxx-spi.o
obj-$(CONFIG_MFD_MC13XXX_I2C) += mc13xxx-i2c.o
+obj-$(CONFIG_MFD_P3H2X4X) += p3h2840.o
obj-$(CONFIG_MFD_PF1550) += pf1550.o
obj-$(CONFIG_MFD_NCT6694) += nct6694.o
diff --git a/drivers/mfd/p3h2840.c b/drivers/mfd/p3h2840.c
new file mode 100644
index 000000000000..774fbb67b025
--- /dev/null
+++ b/drivers/mfd/p3h2840.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2025 NXP
+ * P3H2x4x i3c hub and regulator device.
+ */
+
+#include <linux/i3c/master.h>
+#include <linux/i2c.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/p3h2840.h>
+#include <linux/regmap.h>
+
+static const struct mfd_cell p3h2x4x_devs[] = {
+ {
+ .name = "p3h2x4x-regulator",
+ },
+ {
+ .name = "p3h2x4x-i3c-hub",
+ },
+};
+
+static const struct regmap_config p3h2x4x_regmap_config = {
+ .reg_bits = P3H2x4x_REG_BITS,
+ .val_bits = P3H2x4x_VAL_BITS,
+ .max_register = 0xFF,
+};
+
+static int p3h2x4x_device_probe_i3c(struct i3c_device *i3cdev)
+{
+ struct p3h2x4x_dev *p3h2x4x;
+ int ret;
+
+ p3h2x4x = devm_kzalloc(&i3cdev->dev, sizeof(*p3h2x4x), GFP_KERNEL);
+ if (!p3h2x4x)
+ return -ENOMEM;
+
+ i3cdev_set_drvdata(i3cdev, p3h2x4x);
+
+ p3h2x4x->regmap = devm_regmap_init_i3c(i3cdev, &p3h2x4x_regmap_config);
+ if (IS_ERR(p3h2x4x->regmap))
+ return dev_err_probe(&i3cdev->dev, PTR_ERR(p3h2x4x->regmap),
+ "Failed to register I3C HUB regmap\n");
+
+ p3h2x4x->is_p3h2x4x_in_i3c = true;
+ p3h2x4x->i3cdev = i3cdev;
+
+ ret = devm_mfd_add_devices(&i3cdev->dev, PLATFORM_DEVID_NONE,
+ p3h2x4x_devs, ARRAY_SIZE(p3h2x4x_devs),
+ NULL, 0, NULL);
+ if (ret)
+ return dev_err_probe(&i3cdev->dev, ret, "Failed to add sub devices\n");
+
+ return 0;
+}
+
+static int p3h2x4x_device_probe_i2c(struct i2c_client *client)
+{
+ struct p3h2x4x_dev *p3h2x4x;
+ int ret;
+
+ p3h2x4x = devm_kzalloc(&client->dev, sizeof(*p3h2x4x), GFP_KERNEL);
+ if (!p3h2x4x)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, p3h2x4x);
+
+ p3h2x4x->regmap = devm_regmap_init_i2c(client, &p3h2x4x_regmap_config);
+ if (IS_ERR(p3h2x4x->regmap))
+ return dev_err_probe(&client->dev, PTR_ERR(p3h2x4x->regmap),
+ "Failed to register I3C HUB regmap\n");
+
+ p3h2x4x->is_p3h2x4x_in_i3c = false;
+ p3h2x4x->i2c_client = client;
+
+ ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE,
+ p3h2x4x_devs, ARRAY_SIZE(p3h2x4x_devs),
+ NULL, 0, NULL);
+ if (ret)
+ return dev_err_probe(&client->dev, ret, "Failed to add sub devices\n");
+
+ return 0;
+}
+
+/* p3h2x4x ids (i3c) */
+static const struct i3c_device_id p3h2x4x_i3c_ids[] = {
+ I3C_CLASS(I3C_DCR_HUB, NULL),
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(i3c, p3h2x4x_i3c_ids);
+
+/* p3h2x4x ids (i2c) */
+static const struct i2c_device_id p3h2x4x_i2c_id_table[] = {
+ { "nxp-i3c-hub" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, p3h2x4x_i2c_id_table);
+
+static const struct of_device_id p3h2x4x_i2c_of_match[] = {
+ { .compatible = "nxp,p3h2840", },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, p3h2x4x_i2c_of_match);
+static struct i3c_driver p3h2x4x_i3c = {
+ .driver = {
+ .name = "p3h2x4x_i3c_drv",
+ },
+ .probe = p3h2x4x_device_probe_i3c,
+ .id_table = p3h2x4x_i3c_ids,
+};
+
+static struct i2c_driver p3h2x4x_i2c = {
+ .driver = {
+ .name = "p3h2x4x_i2c_drv",
+ .of_match_table = p3h2x4x_i2c_of_match,
+ },
+ .probe = p3h2x4x_device_probe_i2c,
+ .id_table = p3h2x4x_i2c_id_table,
+};
+
+module_i3c_i2c_driver(p3h2x4x_i3c, &p3h2x4x_i2c);
+
+MODULE_AUTHOR("Aman Kumar Pandey <aman.kumarpandey@nxp.com>");
+MODULE_AUTHOR("Vikash Bansal <vikash.bansal@nxp.com>");
+MODULE_DESCRIPTION("P3H2x4x I3C HUB multi function driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/p3h2840.h b/include/linux/mfd/p3h2840.h
new file mode 100644
index 000000000000..9ed2a0d0564e
--- /dev/null
+++ b/include/linux/mfd/p3h2840.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2025 NXP
+ * This header file contain private Reg address and its bit mapping etc.
+ */
+
+#ifndef _LINUX_MFD_P3H2840_H
+#define _LINUX_MFD_P3H2840_H
+
+#include <linux/types.h>
+
+/* Device Configuration Registers */
+#define P3H2x4x_DEV_REG_PROTECTION_CODE 0x10
+#define P3H2x4x_REGISTERS_LOCK_CODE 0x00
+#define P3H2x4x_REGISTERS_UNLOCK_CODE 0x69
+#define P3H2x4x_CP1_REGISTERS_UNLOCK_CODE 0x6a
+
+/* Reg config for Regmap */
+#define P3H2x4x_REG_BITS 8
+#define P3H2x4x_VAL_BITS 8
+
+struct p3h2x4x_dev {
+ struct i3c_device *i3cdev;
+ struct i2c_client *i2c_client;
+ struct regmap *regmap;
+ bool is_p3h2x4x_in_i3c;
+};
+#endif /* _LINUX_MFD_P3H2840_H */
--
2.25.1
^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v6 4/7] mfd: p3h2x4x: Add driver for NXP P3H2x4x i3c hub and on-die regulator
2026-03-10 6:57 ` [PATCH v6 4/7] mfd: p3h2x4x: Add driver for NXP P3H2x4x i3c hub and on-die regulator Lakshay Piplani
@ 2026-03-10 9:08 ` Jorge Marques
2026-03-10 16:57 ` Frank Li
1 sibling, 0 replies; 26+ messages in thread
From: Jorge Marques @ 2026-03-10 9:08 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood,
vikash.bansal, priyanka.jain, aman.kumarpandey
On Tue, Mar 10, 2026 at 12:27:24PM +0530, Lakshay Piplani wrote:
> From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> Add core MFD support for the NXP P3H2x4x (P3H2440/P3H2441/P3H2840/P3H2841)
> family of multiport I3C hub devices. These devices connect to a host via
> I3C/I2C/SMBus and expose multiple downstream target ports.
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
>
> ---
> Changes in v6:
> - No change
>
> Changes in v5:
> - Corrected the ordering in the Makefile and Kconfig for MFD_P3H2X4X
> - Updated dev_err_probe() for regmap_init failure.
> - Updated module description
>
> Changes in v4:
> - Split the driver into three separate patches(mfd, regulator and I3C hub)
> - Added support for NXP P3H2x4x MFD functionality
> ---
> ---
> MAINTAINERS | 2 +
> drivers/mfd/Kconfig | 12 ++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/p3h2840.c | 126 ++++++++++++++++++++++++++++++++++++
> include/linux/mfd/p3h2840.h | 28 ++++++++
> 5 files changed, 169 insertions(+)
> create mode 100644 drivers/mfd/p3h2840.c
> create mode 100644 include/linux/mfd/p3h2840.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 06b803d6f45d..cc33c6c300e4 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19114,6 +19114,8 @@ L: linux-kernel@vger.kernel.org
> L: linux-i3c-owner@lists.infradead.org
> S: Maintained
> F: Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
> +F: drivers/mfd/p3h2840.c
> +F: include/linux/mfd/p3h2840.h
>
> NXP PF5300/PF5301/PF5302 PMIC REGULATOR DEVICE DRIVER
> M: Woodrow Douglass <wdouglass@carnegierobotics.com>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 7192c9d1d268..645a8e4e62b6 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -617,6 +617,18 @@ config MFD_MX25_TSADC
> i.MX25 processors. They consist of a conversion queue for general
> purpose ADC and a queue for Touchscreens.
>
> +config MFD_P3H2X4X
> + tristate "NXP P3H2X4X I3C Hub Device"
> + depends on I3C
> + select MFD_CORE
> + select REGMAP_I3C
> + help
> + Enable Support for NXP P3H244x/P3H284x I3C HUB device using I3C/I2c
> + communication interface.
> +
> + This driver provides support for I3C Hub and regulator, additional
> + drivers must be enabled in order to use the functionality of the device.
> +
Hi Aman, our CI/CD is failing with
arm-linux-ld: drivers/mfd/p3h2840.o: in function `p3h2x4x_device_probe_i2c':
P3h2840.c:(.text+0x40): undefined reference to `__devm_regmap_init_i2c'
And indeed
$ find . -name 'regmap*.o'
./drivers/base/regmap/regmap.o
./drivers/base/regmap/regmap-i3c.o
It infers the systems based on the KConfig+Makefile
I suggest adding select REGMAP_I2C, since your driver does call i2c
regmap methods (line 67), outside the regmap i3c umbrella.
Also, which drivers must be enabled to use the functionality?
Thanks,
Jorge
> config MFD_PF1550
> tristate "NXP PF1550 PMIC Support"
> depends on I2C=y && OF
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index e75e8045c28a..aaadf50fedf4 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -122,6 +122,7 @@ obj-$(CONFIG_MFD_MC13XXX) += mc13xxx-core.o
> obj-$(CONFIG_MFD_MC13XXX_SPI) += mc13xxx-spi.o
> obj-$(CONFIG_MFD_MC13XXX_I2C) += mc13xxx-i2c.o
>
> +obj-$(CONFIG_MFD_P3H2X4X) += p3h2840.o
> obj-$(CONFIG_MFD_PF1550) += pf1550.o
>
> obj-$(CONFIG_MFD_NCT6694) += nct6694.o
> diff --git a/drivers/mfd/p3h2840.c b/drivers/mfd/p3h2840.c
> new file mode 100644
> index 000000000000..774fbb67b025
> --- /dev/null
> +++ b/drivers/mfd/p3h2840.c
> @@ -0,0 +1,126 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2025 NXP
> + * P3H2x4x i3c hub and regulator device.
> + */
> +
> +#include <linux/i3c/master.h>
> +#include <linux/i2c.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/p3h2840.h>
> +#include <linux/regmap.h>
> +
> +static const struct mfd_cell p3h2x4x_devs[] = {
> + {
> + .name = "p3h2x4x-regulator",
> + },
> + {
> + .name = "p3h2x4x-i3c-hub",
> + },
> +};
> +
> +static const struct regmap_config p3h2x4x_regmap_config = {
> + .reg_bits = P3H2x4x_REG_BITS,
> + .val_bits = P3H2x4x_VAL_BITS,
> + .max_register = 0xFF,
> +};
> +
> +static int p3h2x4x_device_probe_i3c(struct i3c_device *i3cdev)
> +{
> + struct p3h2x4x_dev *p3h2x4x;
> + int ret;
> +
> + p3h2x4x = devm_kzalloc(&i3cdev->dev, sizeof(*p3h2x4x), GFP_KERNEL);
> + if (!p3h2x4x)
> + return -ENOMEM;
> +
> + i3cdev_set_drvdata(i3cdev, p3h2x4x);
> +
> + p3h2x4x->regmap = devm_regmap_init_i3c(i3cdev, &p3h2x4x_regmap_config);
> + if (IS_ERR(p3h2x4x->regmap))
> + return dev_err_probe(&i3cdev->dev, PTR_ERR(p3h2x4x->regmap),
> + "Failed to register I3C HUB regmap\n");
> +
> + p3h2x4x->is_p3h2x4x_in_i3c = true;
> + p3h2x4x->i3cdev = i3cdev;
> +
> + ret = devm_mfd_add_devices(&i3cdev->dev, PLATFORM_DEVID_NONE,
> + p3h2x4x_devs, ARRAY_SIZE(p3h2x4x_devs),
> + NULL, 0, NULL);
> + if (ret)
> + return dev_err_probe(&i3cdev->dev, ret, "Failed to add sub devices\n");
> +
> + return 0;
> +}
> +
> +static int p3h2x4x_device_probe_i2c(struct i2c_client *client)
> +{
> + struct p3h2x4x_dev *p3h2x4x;
> + int ret;
> +
> + p3h2x4x = devm_kzalloc(&client->dev, sizeof(*p3h2x4x), GFP_KERNEL);
> + if (!p3h2x4x)
> + return -ENOMEM;
> +
> + i2c_set_clientdata(client, p3h2x4x);
> +
> + p3h2x4x->regmap = devm_regmap_init_i2c(client, &p3h2x4x_regmap_config);
> + if (IS_ERR(p3h2x4x->regmap))
> + return dev_err_probe(&client->dev, PTR_ERR(p3h2x4x->regmap),
> + "Failed to register I3C HUB regmap\n");
> +
> + p3h2x4x->is_p3h2x4x_in_i3c = false;
> + p3h2x4x->i2c_client = client;
> +
> + ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE,
> + p3h2x4x_devs, ARRAY_SIZE(p3h2x4x_devs),
> + NULL, 0, NULL);
> + if (ret)
> + return dev_err_probe(&client->dev, ret, "Failed to add sub devices\n");
> +
> + return 0;
> +}
> +
> +/* p3h2x4x ids (i3c) */
> +static const struct i3c_device_id p3h2x4x_i3c_ids[] = {
> + I3C_CLASS(I3C_DCR_HUB, NULL),
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(i3c, p3h2x4x_i3c_ids);
> +
> +/* p3h2x4x ids (i2c) */
> +static const struct i2c_device_id p3h2x4x_i2c_id_table[] = {
> + { "nxp-i3c-hub" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(i2c, p3h2x4x_i2c_id_table);
> +
> +static const struct of_device_id p3h2x4x_i2c_of_match[] = {
> + { .compatible = "nxp,p3h2840", },
> + { /* sentinel */ }
> +};
> +
> +MODULE_DEVICE_TABLE(of, p3h2x4x_i2c_of_match);
> +static struct i3c_driver p3h2x4x_i3c = {
> + .driver = {
> + .name = "p3h2x4x_i3c_drv",
> + },
> + .probe = p3h2x4x_device_probe_i3c,
> + .id_table = p3h2x4x_i3c_ids,
> +};
> +
> +static struct i2c_driver p3h2x4x_i2c = {
> + .driver = {
> + .name = "p3h2x4x_i2c_drv",
> + .of_match_table = p3h2x4x_i2c_of_match,
> + },
> + .probe = p3h2x4x_device_probe_i2c,
> + .id_table = p3h2x4x_i2c_id_table,
> +};
> +
> +module_i3c_i2c_driver(p3h2x4x_i3c, &p3h2x4x_i2c);
> +
> +MODULE_AUTHOR("Aman Kumar Pandey <aman.kumarpandey@nxp.com>");
> +MODULE_AUTHOR("Vikash Bansal <vikash.bansal@nxp.com>");
> +MODULE_DESCRIPTION("P3H2x4x I3C HUB multi function driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/mfd/p3h2840.h b/include/linux/mfd/p3h2840.h
> new file mode 100644
> index 000000000000..9ed2a0d0564e
> --- /dev/null
> +++ b/include/linux/mfd/p3h2840.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2025 NXP
> + * This header file contain private Reg address and its bit mapping etc.
> + */
> +
> +#ifndef _LINUX_MFD_P3H2840_H
> +#define _LINUX_MFD_P3H2840_H
> +
> +#include <linux/types.h>
> +
> +/* Device Configuration Registers */
> +#define P3H2x4x_DEV_REG_PROTECTION_CODE 0x10
> +#define P3H2x4x_REGISTERS_LOCK_CODE 0x00
> +#define P3H2x4x_REGISTERS_UNLOCK_CODE 0x69
> +#define P3H2x4x_CP1_REGISTERS_UNLOCK_CODE 0x6a
> +
> +/* Reg config for Regmap */
> +#define P3H2x4x_REG_BITS 8
> +#define P3H2x4x_VAL_BITS 8
> +
> +struct p3h2x4x_dev {
> + struct i3c_device *i3cdev;
> + struct i2c_client *i2c_client;
> + struct regmap *regmap;
> + bool is_p3h2x4x_in_i3c;
> +};
> +#endif /* _LINUX_MFD_P3H2840_H */
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v6 4/7] mfd: p3h2x4x: Add driver for NXP P3H2x4x i3c hub and on-die regulator
2026-03-10 6:57 ` [PATCH v6 4/7] mfd: p3h2x4x: Add driver for NXP P3H2x4x i3c hub and on-die regulator Lakshay Piplani
2026-03-10 9:08 ` Jorge Marques
@ 2026-03-10 16:57 ` Frank Li
1 sibling, 0 replies; 26+ messages in thread
From: Frank Li @ 2026-03-10 16:57 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, lgirdwood, vikash.bansal,
priyanka.jain, aman.kumarpandey
On Tue, Mar 10, 2026 at 12:27:24PM +0530, Lakshay Piplani wrote:
> From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> Add core MFD support for the NXP P3H2x4x (P3H2440/P3H2441/P3H2840/P3H2841)
> family of multiport I3C hub devices. These devices connect to a host via
> I3C/I2C/SMBus and expose multiple downstream target ports.
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
>
...
>
> +config MFD_P3H2X4X
> + tristate "NXP P3H2X4X I3C Hub Device"
> + depends on I3C
Use new config I3C_OR_I2C
> + select MFD_CORE
> + select REGMAP_I3C
> + help
> + Enable Support for NXP P3H244x/P3H284x I3C HUB device using I3C/I2c
> + communication interface.
> +
> + This driver provides support for I3C Hub and regulator, additional
> + drivers must be enabled in order to use the functionality of the device.
> +
...
> +
> +struct p3h2x4x_dev {
> + struct i3c_device *i3cdev;
> + struct i2c_client *i2c_client;
Any place use this variable? suppose you get it from regmap's dev by
i2c_get_clientdata()
Frank
> + struct regmap *regmap;
> + bool is_p3h2x4x_in_i3c;
> +};
> +#endif /* _LINUX_MFD_P3H2840_H */
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v6 5/7] regulator: p3h2x4x: Add driver for on-die regulators in NXP P3H2x4x i3c hub
2026-03-10 6:57 [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub Lakshay Piplani
` (2 preceding siblings ...)
2026-03-10 6:57 ` [PATCH v6 4/7] mfd: p3h2x4x: Add driver for NXP P3H2x4x i3c hub and on-die regulator Lakshay Piplani
@ 2026-03-10 6:57 ` Lakshay Piplani
2026-03-10 17:00 ` Frank Li
2026-03-10 6:57 ` [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub Lakshay Piplani
` (3 subsequent siblings)
7 siblings, 1 reply; 26+ messages in thread
From: Lakshay Piplani @ 2026-03-10 6:57 UTC (permalink / raw)
To: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood
Cc: vikash.bansal, priyanka.jain, aman.kumarpandey, lakshay.piplani
From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
The NXP P3H2x4x family integrates on-die regulators alongside I3C hub
functionality. This driver registers the regulators using the MFD
framework and exposes them via the regulator subsystem.
Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
---
Changes in v6:
- Use DEFINE_LOCK_GUARD_1 for reg lock/unlock
Changes in v5:
- Updated dev_err_probe() for regmap_init failure.
- Updated module description
Changes in v4:
- Split the driver into three separate patches (mfd, regulator and I3C hub)
- Introduced driver for on-die regulators in NXP P3H2x4x I3C hub
---
---
MAINTAINERS | 1 +
drivers/regulator/Kconfig | 10 +
drivers/regulator/Makefile | 1 +
drivers/regulator/p3h2840_i3c_hub_regulator.c | 219 ++++++++++++++++++
4 files changed, 231 insertions(+)
create mode 100644 drivers/regulator/p3h2840_i3c_hub_regulator.c
diff --git a/MAINTAINERS b/MAINTAINERS
index cc33c6c300e4..2fc44b489ea1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19115,6 +19115,7 @@ L: linux-i3c-owner@lists.infradead.org
S: Maintained
F: Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
F: drivers/mfd/p3h2840.c
+F: drivers/regulator/p3h2840_i3c_hub_regulator.c
F: include/linux/mfd/p3h2840.h
NXP PF5300/PF5301/PF5302 PMIC REGULATOR DEVICE DRIVER
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index a708fc63f581..f3f57b74e2ad 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1019,6 +1019,16 @@ config REGULATOR_MTK_DVFSRC
of Mediatek. It allows for voting on regulator state
between multiple users.
+config REGULATOR_P3H2X4X
+ tristate "P3H2X4X regulator support"
+ depends on MFD_P3H2X4X
+ help
+ This driver provides support for the voltage regulators of the
+ P3H244x/P3H284x multi-function I3C Hub device.
+
+ Say M here if you want to include support for this regulator as
+ a module. The module will be named "p3h2840_i3c_hub_regulator".
+
config REGULATOR_PALMAS
tristate "TI Palmas PMIC Regulators"
depends on MFD_PALMAS
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 35639f3115fd..46f586ccde63 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -128,6 +128,7 @@ obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_SPMI) += qcom_spmi-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_USB_VBUS) += qcom_usb_vbus-regulator.o
+obj-$(CONFIG_REGULATOR_P3H2X4X) += p3h2840_i3c_hub_regulator.o
obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
obj-$(CONFIG_REGULATOR_PCA9450) += pca9450-regulator.o
obj-$(CONFIG_REGULATOR_PF0900) += pf0900-regulator.o
diff --git a/drivers/regulator/p3h2840_i3c_hub_regulator.c b/drivers/regulator/p3h2840_i3c_hub_regulator.c
new file mode 100644
index 000000000000..b2d31ecd5f19
--- /dev/null
+++ b/drivers/regulator/p3h2840_i3c_hub_regulator.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2025 NXP
+ * This P3H2x4x driver file contain functions for enable/disable regulator and voltage set/get.
+ */
+#include <linux/bitfield.h>
+#include <linux/cleanup.h>
+#include <linux/mfd/p3h2840.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+
+#define P3H2x4x_LDO_AND_PULLUP_CONF 0x19
+#define P3H2x4x_LDO_ENABLE_DISABLE_MASK GENMASK(3, 0)
+#define P3H2x4x_CP0_EN_LDO BIT(0)
+#define P3H2x4x_CP1_EN_LDO BIT(1)
+#define P3H2x4x_TP0145_EN_LDO BIT(2)
+#define P3H2x4x_TP2367_EN_LDO BIT(3)
+
+#define P3H2x4x_NET_OPER_MODE_CONF 0x15
+#define P3H2x4x_VCCIO_LDO_CONF 0x16
+#define P3H2x4x_CP0_VCCIO_LDO_VOLTAGE_MASK GENMASK(1, 0)
+#define P3H2x4x_CP0_VCCIO_LDO_VOLTAGE(x) \
+ FIELD_PREP(P3H2x4x_CP0_VCCIO_LDO_VOLTAGE_MASK, x)
+#define P3H2x4x_CP1_VCCIO_LDO_VOLTAGE_MASK GENMASK(3, 2)
+#define P3H2x4x_CP1_VCCIO_LDO_VOLTAGE(x) \
+ FIELD_PREP(P3H2x4x_CP1_VCCIO_LDO_VOLTAGE_MASK, x)
+#define P3H2x4x_TP0145_VCCIO_LDO_VOLTAGE_MASK GENMASK(5, 4)
+#define P3H2x4x_TP0145_VCCIO_LDO_VOLTAGE(x) \
+ FIELD_PREP(P3H2x4x_TP0145_VCCIO_LDO_VOLTAGE_MASK, x)
+#define P3H2x4x_TP2367_VCCIO_LDO_VOLTAGE_MASK GENMASK(7, 6)
+#define P3H2x4x_TP2367_VCCIO_LDO_VOLTAGE(x) \
+ FIELD_PREP(P3H2x4x_TP2367_VCCIO_LDO_VOLTAGE_MASK, x)
+#define P3H2x4x_LDO_COUNT 4
+
+struct p3h2x4x_regulator_dev {
+ struct regulator_dev *rp3h2x4x_dev[P3H2x4x_LDO_COUNT];
+ struct regmap *regmap;
+};
+
+struct p3h2x4x_reg_state {
+ unsigned int orig;
+ bool restore;
+};
+
+static void p3h2x4x_reg_guard_enter(struct regulator_dev *rdev,
+ struct p3h2x4x_reg_state *state)
+{
+ state->restore = false;
+
+ if (regmap_read(rdev->regmap,
+ P3H2x4x_DEV_REG_PROTECTION_CODE,
+ &state->orig))
+ return;
+
+ if (state->orig != P3H2x4x_REGISTERS_UNLOCK_CODE) {
+ regmap_write(rdev->regmap,
+ P3H2x4x_DEV_REG_PROTECTION_CODE,
+ P3H2x4x_REGISTERS_UNLOCK_CODE);
+ state->restore = true;
+ }
+}
+
+static void p3h2x4x_reg_guard_exit(struct regulator_dev *rdev,
+ struct p3h2x4x_reg_state *state)
+{
+ if (state->restore)
+ regmap_write(rdev->regmap,
+ P3H2x4x_DEV_REG_PROTECTION_CODE,
+ state->orig);
+}
+
+DEFINE_LOCK_GUARD_1(p3h2x4x_reg, struct regulator_dev,
+ p3h2x4x_reg_guard_enter(_T->lock, &_T->state),
+ p3h2x4x_reg_guard_exit(_T->lock, &_T->state),
+ struct p3h2x4x_reg_state state);
+
+static int p3h2x4x_regulator_enable(struct regulator_dev *rdev)
+{
+ guard(p3h2x4x_reg)(rdev);
+ return regulator_enable_regmap(rdev);
+}
+
+static int p3h2x4x_regulator_disable(struct regulator_dev *rdev)
+{
+ guard(p3h2x4x_reg)(rdev);
+ return regulator_disable_regmap(rdev);
+}
+
+static int p3h2x4x_regulator_set_voltage_sel(struct regulator_dev *rdev,
+ unsigned int sel)
+{
+ guard(p3h2x4x_reg)(rdev);
+ return regulator_set_voltage_sel_regmap(rdev, sel);
+}
+
+static const struct regulator_ops p3h2x4x_ldo_ops = {
+ .list_voltage = regulator_list_voltage_table,
+ .map_voltage = regulator_map_voltage_iterate,
+ .set_voltage_sel = p3h2x4x_regulator_set_voltage_sel,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .enable = p3h2x4x_regulator_enable,
+ .disable = p3h2x4x_regulator_disable,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+static const unsigned int p3h2x4x_voltage_table[] = {
+ 1000000,
+ 1100000,
+ 1200000,
+ 1800000,
+};
+
+static struct regulator_desc p3h2x4x_regulators[] = {
+ {
+ .name = "ldo-cp0",
+ .of_match = of_match_ptr("ldo-cp0"),
+ .regulators_node = of_match_ptr("regulators"),
+ .volt_table = p3h2x4x_voltage_table,
+ .n_voltages = ARRAY_SIZE(p3h2x4x_voltage_table),
+ .ops = &p3h2x4x_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .enable_reg = P3H2x4x_LDO_AND_PULLUP_CONF,
+ .enable_mask = P3H2x4x_CP0_EN_LDO,
+ .vsel_reg = P3H2x4x_VCCIO_LDO_CONF,
+ .vsel_mask = P3H2x4x_CP0_VCCIO_LDO_VOLTAGE_MASK,
+ },
+ {
+ .name = "ldo-cp1",
+ .of_match = of_match_ptr("ldo-cp1"),
+ .regulators_node = of_match_ptr("regulators"),
+ .volt_table = p3h2x4x_voltage_table,
+ .n_voltages = ARRAY_SIZE(p3h2x4x_voltage_table),
+ .ops = &p3h2x4x_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .enable_reg = P3H2x4x_LDO_AND_PULLUP_CONF,
+ .enable_mask = P3H2x4x_CP1_EN_LDO,
+ .vsel_reg = P3H2x4x_VCCIO_LDO_CONF,
+ .vsel_mask = P3H2x4x_CP1_VCCIO_LDO_VOLTAGE_MASK,
+ },
+ {
+ .name = "ldo-tpg0",
+ .of_match = of_match_ptr("ldo-tpg0"),
+ .regulators_node = of_match_ptr("regulators"),
+ .volt_table = p3h2x4x_voltage_table,
+ .n_voltages = ARRAY_SIZE(p3h2x4x_voltage_table),
+ .ops = &p3h2x4x_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .enable_reg = P3H2x4x_LDO_AND_PULLUP_CONF,
+ .enable_mask = P3H2x4x_TP0145_EN_LDO,
+ .vsel_reg = P3H2x4x_VCCIO_LDO_CONF,
+ .vsel_mask = P3H2x4x_TP0145_VCCIO_LDO_VOLTAGE_MASK,
+ },
+ {
+ .name = "ldo-tpg1",
+ .of_match = of_match_ptr("ldo-tpg1"),
+ .regulators_node = of_match_ptr("regulators"),
+ .volt_table = p3h2x4x_voltage_table,
+ .n_voltages = ARRAY_SIZE(p3h2x4x_voltage_table),
+ .ops = &p3h2x4x_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .enable_reg = P3H2x4x_LDO_AND_PULLUP_CONF,
+ .enable_mask = P3H2x4x_TP2367_EN_LDO,
+ .vsel_reg = P3H2x4x_VCCIO_LDO_CONF,
+ .vsel_mask = P3H2x4x_TP2367_VCCIO_LDO_VOLTAGE_MASK,
+ },
+};
+
+static int p3h2x4x_regulator_probe(struct platform_device *pdev)
+{
+ struct p3h2x4x_dev *p3h2x4x = dev_get_drvdata(pdev->dev.parent);
+ struct p3h2x4x_regulator_dev *p3h2x4x_regulator;
+ struct regulator_config rcfg = { };
+ struct device *dev = &pdev->dev;
+ struct regulator_dev *rdev;
+ int i;
+
+ p3h2x4x_regulator = devm_kzalloc(dev, sizeof(*p3h2x4x_regulator), GFP_KERNEL);
+ if (!p3h2x4x_regulator)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, p3h2x4x_regulator);
+
+ p3h2x4x_regulator->regmap = p3h2x4x->regmap;
+ device_set_of_node_from_dev(dev, dev->parent);
+
+ rcfg.dev = dev;
+ rcfg.dev->of_node = dev->of_node;
+ rcfg.regmap = p3h2x4x_regulator->regmap;
+ rcfg.driver_data = p3h2x4x_regulator;
+
+ for (i = 0; i < ARRAY_SIZE(p3h2x4x_regulators); i++) {
+ rdev = devm_regulator_register(&pdev->dev, &p3h2x4x_regulators[i], &rcfg);
+ if (IS_ERR(rdev))
+ return dev_err_probe(dev, PTR_ERR(rdev), "Failed to register %s\n",
+ p3h2x4x_regulators[i].name);
+ p3h2x4x_regulator->rp3h2x4x_dev[i] = rdev;
+ }
+ return 0;
+}
+
+static struct platform_driver p3h2x4x_regulator_driver = {
+ .driver = {
+ .name = "p3h2x4x-regulator",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ },
+ .probe = p3h2x4x_regulator_probe,
+};
+module_platform_driver(p3h2x4x_regulator_driver);
+
+MODULE_AUTHOR("Aman Kumar Pandey <aman.kumarpandey@nxp.com>");
+MODULE_AUTHOR("Vikash Bansal <vikash.bansal@nxp.com>");
+MODULE_DESCRIPTION("P3H2x4x I3C HUB Regulator driver");
+MODULE_LICENSE("GPL");
--
2.25.1
^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v6 5/7] regulator: p3h2x4x: Add driver for on-die regulators in NXP P3H2x4x i3c hub
2026-03-10 6:57 ` [PATCH v6 5/7] regulator: p3h2x4x: Add driver for on-die regulators in NXP P3H2x4x i3c hub Lakshay Piplani
@ 2026-03-10 17:00 ` Frank Li
0 siblings, 0 replies; 26+ messages in thread
From: Frank Li @ 2026-03-10 17:00 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, lgirdwood, vikash.bansal,
priyanka.jain, aman.kumarpandey
On Tue, Mar 10, 2026 at 12:27:25PM +0530, Lakshay Piplani wrote:
> From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> The NXP P3H2x4x family integrates on-die regulators alongside I3C hub
> functionality. This driver registers the regulators using the MFD
> framework and exposes them via the regulator subsystem.
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
>
> ---
Reviewed-by: Frank Li <Frank.Li@nxp.com>
> Changes in v6:
> - Use DEFINE_LOCK_GUARD_1 for reg lock/unlock
>
> Changes in v5:
> - Updated dev_err_probe() for regmap_init failure.
> - Updated module description
>
> Changes in v4:
> - Split the driver into three separate patches (mfd, regulator and I3C hub)
> - Introduced driver for on-die regulators in NXP P3H2x4x I3C hub
> ---
> ---
> MAINTAINERS | 1 +
> drivers/regulator/Kconfig | 10 +
> drivers/regulator/Makefile | 1 +
> drivers/regulator/p3h2840_i3c_hub_regulator.c | 219 ++++++++++++++++++
> 4 files changed, 231 insertions(+)
> create mode 100644 drivers/regulator/p3h2840_i3c_hub_regulator.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index cc33c6c300e4..2fc44b489ea1 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19115,6 +19115,7 @@ L: linux-i3c-owner@lists.infradead.org
> S: Maintained
> F: Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
> F: drivers/mfd/p3h2840.c
> +F: drivers/regulator/p3h2840_i3c_hub_regulator.c
> F: include/linux/mfd/p3h2840.h
>
> NXP PF5300/PF5301/PF5302 PMIC REGULATOR DEVICE DRIVER
> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
> index a708fc63f581..f3f57b74e2ad 100644
> --- a/drivers/regulator/Kconfig
> +++ b/drivers/regulator/Kconfig
> @@ -1019,6 +1019,16 @@ config REGULATOR_MTK_DVFSRC
> of Mediatek. It allows for voting on regulator state
> between multiple users.
>
> +config REGULATOR_P3H2X4X
> + tristate "P3H2X4X regulator support"
> + depends on MFD_P3H2X4X
> + help
> + This driver provides support for the voltage regulators of the
> + P3H244x/P3H284x multi-function I3C Hub device.
> +
> + Say M here if you want to include support for this regulator as
> + a module. The module will be named "p3h2840_i3c_hub_regulator".
> +
> config REGULATOR_PALMAS
> tristate "TI Palmas PMIC Regulators"
> depends on MFD_PALMAS
> diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
> index 35639f3115fd..46f586ccde63 100644
> --- a/drivers/regulator/Makefile
> +++ b/drivers/regulator/Makefile
> @@ -128,6 +128,7 @@ obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
> obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o
> obj-$(CONFIG_REGULATOR_QCOM_SPMI) += qcom_spmi-regulator.o
> obj-$(CONFIG_REGULATOR_QCOM_USB_VBUS) += qcom_usb_vbus-regulator.o
> +obj-$(CONFIG_REGULATOR_P3H2X4X) += p3h2840_i3c_hub_regulator.o
> obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
> obj-$(CONFIG_REGULATOR_PCA9450) += pca9450-regulator.o
> obj-$(CONFIG_REGULATOR_PF0900) += pf0900-regulator.o
> diff --git a/drivers/regulator/p3h2840_i3c_hub_regulator.c b/drivers/regulator/p3h2840_i3c_hub_regulator.c
> new file mode 100644
> index 000000000000..b2d31ecd5f19
> --- /dev/null
> +++ b/drivers/regulator/p3h2840_i3c_hub_regulator.c
> @@ -0,0 +1,219 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2025 NXP
> + * This P3H2x4x driver file contain functions for enable/disable regulator and voltage set/get.
> + */
> +#include <linux/bitfield.h>
> +#include <linux/cleanup.h>
> +#include <linux/mfd/p3h2840.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/driver.h>
> +
> +#define P3H2x4x_LDO_AND_PULLUP_CONF 0x19
> +#define P3H2x4x_LDO_ENABLE_DISABLE_MASK GENMASK(3, 0)
> +#define P3H2x4x_CP0_EN_LDO BIT(0)
> +#define P3H2x4x_CP1_EN_LDO BIT(1)
> +#define P3H2x4x_TP0145_EN_LDO BIT(2)
> +#define P3H2x4x_TP2367_EN_LDO BIT(3)
> +
> +#define P3H2x4x_NET_OPER_MODE_CONF 0x15
> +#define P3H2x4x_VCCIO_LDO_CONF 0x16
> +#define P3H2x4x_CP0_VCCIO_LDO_VOLTAGE_MASK GENMASK(1, 0)
> +#define P3H2x4x_CP0_VCCIO_LDO_VOLTAGE(x) \
> + FIELD_PREP(P3H2x4x_CP0_VCCIO_LDO_VOLTAGE_MASK, x)
> +#define P3H2x4x_CP1_VCCIO_LDO_VOLTAGE_MASK GENMASK(3, 2)
> +#define P3H2x4x_CP1_VCCIO_LDO_VOLTAGE(x) \
> + FIELD_PREP(P3H2x4x_CP1_VCCIO_LDO_VOLTAGE_MASK, x)
> +#define P3H2x4x_TP0145_VCCIO_LDO_VOLTAGE_MASK GENMASK(5, 4)
> +#define P3H2x4x_TP0145_VCCIO_LDO_VOLTAGE(x) \
> + FIELD_PREP(P3H2x4x_TP0145_VCCIO_LDO_VOLTAGE_MASK, x)
> +#define P3H2x4x_TP2367_VCCIO_LDO_VOLTAGE_MASK GENMASK(7, 6)
> +#define P3H2x4x_TP2367_VCCIO_LDO_VOLTAGE(x) \
> + FIELD_PREP(P3H2x4x_TP2367_VCCIO_LDO_VOLTAGE_MASK, x)
> +#define P3H2x4x_LDO_COUNT 4
> +
> +struct p3h2x4x_regulator_dev {
> + struct regulator_dev *rp3h2x4x_dev[P3H2x4x_LDO_COUNT];
> + struct regmap *regmap;
> +};
> +
> +struct p3h2x4x_reg_state {
> + unsigned int orig;
> + bool restore;
> +};
> +
> +static void p3h2x4x_reg_guard_enter(struct regulator_dev *rdev,
> + struct p3h2x4x_reg_state *state)
> +{
> + state->restore = false;
> +
> + if (regmap_read(rdev->regmap,
> + P3H2x4x_DEV_REG_PROTECTION_CODE,
> + &state->orig))
> + return;
> +
> + if (state->orig != P3H2x4x_REGISTERS_UNLOCK_CODE) {
> + regmap_write(rdev->regmap,
> + P3H2x4x_DEV_REG_PROTECTION_CODE,
> + P3H2x4x_REGISTERS_UNLOCK_CODE);
> + state->restore = true;
> + }
> +}
> +
> +static void p3h2x4x_reg_guard_exit(struct regulator_dev *rdev,
> + struct p3h2x4x_reg_state *state)
> +{
> + if (state->restore)
> + regmap_write(rdev->regmap,
> + P3H2x4x_DEV_REG_PROTECTION_CODE,
> + state->orig);
> +}
> +
> +DEFINE_LOCK_GUARD_1(p3h2x4x_reg, struct regulator_dev,
> + p3h2x4x_reg_guard_enter(_T->lock, &_T->state),
> + p3h2x4x_reg_guard_exit(_T->lock, &_T->state),
> + struct p3h2x4x_reg_state state);
> +
> +static int p3h2x4x_regulator_enable(struct regulator_dev *rdev)
> +{
> + guard(p3h2x4x_reg)(rdev);
> + return regulator_enable_regmap(rdev);
> +}
> +
> +static int p3h2x4x_regulator_disable(struct regulator_dev *rdev)
> +{
> + guard(p3h2x4x_reg)(rdev);
> + return regulator_disable_regmap(rdev);
> +}
> +
> +static int p3h2x4x_regulator_set_voltage_sel(struct regulator_dev *rdev,
> + unsigned int sel)
> +{
> + guard(p3h2x4x_reg)(rdev);
> + return regulator_set_voltage_sel_regmap(rdev, sel);
> +}
> +
> +static const struct regulator_ops p3h2x4x_ldo_ops = {
> + .list_voltage = regulator_list_voltage_table,
> + .map_voltage = regulator_map_voltage_iterate,
> + .set_voltage_sel = p3h2x4x_regulator_set_voltage_sel,
> + .get_voltage_sel = regulator_get_voltage_sel_regmap,
> + .enable = p3h2x4x_regulator_enable,
> + .disable = p3h2x4x_regulator_disable,
> + .is_enabled = regulator_is_enabled_regmap,
> +};
> +
> +static const unsigned int p3h2x4x_voltage_table[] = {
> + 1000000,
> + 1100000,
> + 1200000,
> + 1800000,
> +};
> +
> +static struct regulator_desc p3h2x4x_regulators[] = {
> + {
> + .name = "ldo-cp0",
> + .of_match = of_match_ptr("ldo-cp0"),
> + .regulators_node = of_match_ptr("regulators"),
> + .volt_table = p3h2x4x_voltage_table,
> + .n_voltages = ARRAY_SIZE(p3h2x4x_voltage_table),
> + .ops = &p3h2x4x_ldo_ops,
> + .type = REGULATOR_VOLTAGE,
> + .owner = THIS_MODULE,
> + .enable_reg = P3H2x4x_LDO_AND_PULLUP_CONF,
> + .enable_mask = P3H2x4x_CP0_EN_LDO,
> + .vsel_reg = P3H2x4x_VCCIO_LDO_CONF,
> + .vsel_mask = P3H2x4x_CP0_VCCIO_LDO_VOLTAGE_MASK,
> + },
> + {
> + .name = "ldo-cp1",
> + .of_match = of_match_ptr("ldo-cp1"),
> + .regulators_node = of_match_ptr("regulators"),
> + .volt_table = p3h2x4x_voltage_table,
> + .n_voltages = ARRAY_SIZE(p3h2x4x_voltage_table),
> + .ops = &p3h2x4x_ldo_ops,
> + .type = REGULATOR_VOLTAGE,
> + .owner = THIS_MODULE,
> + .enable_reg = P3H2x4x_LDO_AND_PULLUP_CONF,
> + .enable_mask = P3H2x4x_CP1_EN_LDO,
> + .vsel_reg = P3H2x4x_VCCIO_LDO_CONF,
> + .vsel_mask = P3H2x4x_CP1_VCCIO_LDO_VOLTAGE_MASK,
> + },
> + {
> + .name = "ldo-tpg0",
> + .of_match = of_match_ptr("ldo-tpg0"),
> + .regulators_node = of_match_ptr("regulators"),
> + .volt_table = p3h2x4x_voltage_table,
> + .n_voltages = ARRAY_SIZE(p3h2x4x_voltage_table),
> + .ops = &p3h2x4x_ldo_ops,
> + .type = REGULATOR_VOLTAGE,
> + .owner = THIS_MODULE,
> + .enable_reg = P3H2x4x_LDO_AND_PULLUP_CONF,
> + .enable_mask = P3H2x4x_TP0145_EN_LDO,
> + .vsel_reg = P3H2x4x_VCCIO_LDO_CONF,
> + .vsel_mask = P3H2x4x_TP0145_VCCIO_LDO_VOLTAGE_MASK,
> + },
> + {
> + .name = "ldo-tpg1",
> + .of_match = of_match_ptr("ldo-tpg1"),
> + .regulators_node = of_match_ptr("regulators"),
> + .volt_table = p3h2x4x_voltage_table,
> + .n_voltages = ARRAY_SIZE(p3h2x4x_voltage_table),
> + .ops = &p3h2x4x_ldo_ops,
> + .type = REGULATOR_VOLTAGE,
> + .owner = THIS_MODULE,
> + .enable_reg = P3H2x4x_LDO_AND_PULLUP_CONF,
> + .enable_mask = P3H2x4x_TP2367_EN_LDO,
> + .vsel_reg = P3H2x4x_VCCIO_LDO_CONF,
> + .vsel_mask = P3H2x4x_TP2367_VCCIO_LDO_VOLTAGE_MASK,
> + },
> +};
> +
> +static int p3h2x4x_regulator_probe(struct platform_device *pdev)
> +{
> + struct p3h2x4x_dev *p3h2x4x = dev_get_drvdata(pdev->dev.parent);
> + struct p3h2x4x_regulator_dev *p3h2x4x_regulator;
> + struct regulator_config rcfg = { };
> + struct device *dev = &pdev->dev;
> + struct regulator_dev *rdev;
> + int i;
> +
> + p3h2x4x_regulator = devm_kzalloc(dev, sizeof(*p3h2x4x_regulator), GFP_KERNEL);
> + if (!p3h2x4x_regulator)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, p3h2x4x_regulator);
> +
> + p3h2x4x_regulator->regmap = p3h2x4x->regmap;
> + device_set_of_node_from_dev(dev, dev->parent);
> +
> + rcfg.dev = dev;
> + rcfg.dev->of_node = dev->of_node;
> + rcfg.regmap = p3h2x4x_regulator->regmap;
> + rcfg.driver_data = p3h2x4x_regulator;
> +
> + for (i = 0; i < ARRAY_SIZE(p3h2x4x_regulators); i++) {
> + rdev = devm_regulator_register(&pdev->dev, &p3h2x4x_regulators[i], &rcfg);
> + if (IS_ERR(rdev))
> + return dev_err_probe(dev, PTR_ERR(rdev), "Failed to register %s\n",
> + p3h2x4x_regulators[i].name);
> + p3h2x4x_regulator->rp3h2x4x_dev[i] = rdev;
> + }
> + return 0;
> +}
> +
> +static struct platform_driver p3h2x4x_regulator_driver = {
> + .driver = {
> + .name = "p3h2x4x-regulator",
> + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> + },
> + .probe = p3h2x4x_regulator_probe,
> +};
> +module_platform_driver(p3h2x4x_regulator_driver);
> +
> +MODULE_AUTHOR("Aman Kumar Pandey <aman.kumarpandey@nxp.com>");
> +MODULE_AUTHOR("Vikash Bansal <vikash.bansal@nxp.com>");
> +MODULE_DESCRIPTION("P3H2x4x I3C HUB Regulator driver");
> +MODULE_LICENSE("GPL");
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub
2026-03-10 6:57 [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub Lakshay Piplani
` (3 preceding siblings ...)
2026-03-10 6:57 ` [PATCH v6 5/7] regulator: p3h2x4x: Add driver for on-die regulators in NXP P3H2x4x i3c hub Lakshay Piplani
@ 2026-03-10 6:57 ` Lakshay Piplani
2026-03-10 9:11 ` Jorge Marques
` (3 more replies)
2026-03-10 6:57 ` [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality Lakshay Piplani
` (2 subsequent siblings)
7 siblings, 4 replies; 26+ messages in thread
From: Lakshay Piplani @ 2026-03-10 6:57 UTC (permalink / raw)
To: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood
Cc: vikash.bansal, priyanka.jain, aman.kumarpandey, lakshay.piplani
Add virtual I3C bus support for the hub and provide interface to enable
or disable downstream ports.
Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
Signed-off-by: Lakshay Piplani <lakshay.piplani@nxp.com>
---
Changes in v6:
- Add support for the generic I3C interface in the I3C Hub
---
---
MAINTAINERS | 3 +
drivers/i3c/Kconfig | 15 ++
drivers/i3c/Makefile | 1 +
drivers/i3c/hub.c | 459 ++++++++++++++++++++++++++++++++++++++++
include/linux/i3c/hub.h | 107 ++++++++++
5 files changed, 585 insertions(+)
create mode 100644 drivers/i3c/hub.c
create mode 100644 include/linux/i3c/hub.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 2fc44b489ea1..7613b4b59290 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19110,12 +19110,15 @@ F: drivers/ptp/ptp_netc.c
NXP P3H2X4X I3C-HUB DRIVER
M: Vikash Bansal <vikash.bansal@nxp.com>
M: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
+M: Lakshay Piplani <lakshay.piplani@nxp.com>
L: linux-kernel@vger.kernel.org
L: linux-i3c-owner@lists.infradead.org
S: Maintained
F: Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
+F: drivers/i3c/hub.c
F: drivers/mfd/p3h2840.c
F: drivers/regulator/p3h2840_i3c_hub_regulator.c
+F: include/linux/i3c/hub.h
F: include/linux/mfd/p3h2840.h
NXP PF5300/PF5301/PF5302 PMIC REGULATOR DEVICE DRIVER
diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig
index 30a441506f61..889d781f099b 100644
--- a/drivers/i3c/Kconfig
+++ b/drivers/i3c/Kconfig
@@ -21,4 +21,19 @@ menuconfig I3C
if I3C
source "drivers/i3c/master/Kconfig"
+
+config I3C_HUB
+ bool "I3C Hub Support"
+ depends on I3C
+ help
+ Enable support for the I3C interface in hub devices.
+
+ This option adds virtual I3C bus support for hubs by creating
+ virtual master controllers for downstream ports and forwarding
+ bus operations through the hub device. It also provides an
+ interface used by hub drivers to enable or disable downstream
+ ports during bus transactions.
+
+ Say Y here if your platform includes an I3C hub device
+
endif # I3C
diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile
index 11982efbc6d9..9ddee56a6338 100644
--- a/drivers/i3c/Makefile
+++ b/drivers/i3c/Makefile
@@ -2,3 +2,4 @@
i3c-y := device.o master.o
obj-$(CONFIG_I3C) += i3c.o
obj-$(CONFIG_I3C) += master/
+obj-$(CONFIG_I3C_HUB) += hub.o
diff --git a/drivers/i3c/hub.c b/drivers/i3c/hub.c
new file mode 100644
index 000000000000..9cdea8635327
--- /dev/null
+++ b/drivers/i3c/hub.c
@@ -0,0 +1,459 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2026 NXP
+ * Generic I3C Hub core implementing virtual controller operations.
+ */
+#include <linux/i3c/device.h>
+#include <linux/i3c/hub.h>
+
+#include "internals.h"
+
+/**
+ * i3c_hub_master_bus_init() - Bind controller to hub device
+ * @controller: Virtual controller for a hub port
+ *
+ * Associates the virtual controller with the hub device descriptor so that
+ * transfers are executed through the hub on the parent bus.
+ */
+static int i3c_hub_master_bus_init(struct i3c_master_controller *controller)
+{
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_hub *hub;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return -ENODEV;
+
+ hub = hub_controller->hub;
+
+ if (!hub->hub_dev)
+ return -ENODEV;
+
+ controller->this = hub->hub_dev->desc;
+ return 0;
+}
+
+static void i3c_hub_master_bus_cleanup(struct i3c_master_controller *controller)
+{
+ controller->this = NULL;
+}
+
+static int i3c_hub_attach_i3c_dev(struct i3c_dev_desc *dev)
+{
+ return 0;
+}
+
+static int i3c_hub_reattach_i3c_dev(struct i3c_dev_desc *dev, u8 old_dyn_addr)
+{
+ return 0;
+}
+
+static void i3c_hub_detach_i3c_dev(struct i3c_dev_desc *dev)
+{
+}
+
+/**
+ * i3c_hub_do_daa() - Perform DAA via hub port
+ * @hub: Hub instance
+ * @controller: Virtual controller for a hub port
+ *
+ * Enables the port connection, performs DAA on the parent controller,
+ * then disables the connection.
+ */
+static int i3c_hub_do_daa(struct i3c_hub *hub,
+ struct i3c_master_controller *controller)
+{
+ int ret;
+
+ if (!hub || !hub->parent)
+ return -ENODEV;
+
+ i3c_hub_enable_port(controller);
+ ret = i3c_master_do_daa(hub->parent);
+ i3c_hub_disable_port(controller);
+
+ return ret;
+}
+
+static bool i3c_hub_supports_ccc_cmd(struct i3c_hub *hub,
+ const struct i3c_ccc_cmd *cmd)
+{
+ return i3c_master_supports_ccc_cmd(hub->parent, cmd);
+}
+
+/**
+ * i3c_hub_send_ccc_cmd() - Send CCC through hub port
+ * @hub: Hub instance
+ * @controller: Virtual controller
+ * @cmd: CCC command
+ *
+ * Enables the port connection while issuing CCC on the parent controller.
+ */
+static int i3c_hub_send_ccc_cmd(struct i3c_hub *hub,
+ struct i3c_master_controller *controller,
+ struct i3c_ccc_cmd *cmd)
+{
+ int ret;
+
+ if (!hub || !hub->parent)
+ return -ENODEV;
+
+ i3c_hub_enable_port(controller);
+ ret = i3c_master_send_ccc_cmd(hub->parent, cmd);
+ i3c_hub_disable_port(controller);
+
+ return ret;
+}
+
+/**
+ * i3c_hub_master_priv_xfers() - Execute private transfers via hub
+ * @dev: Target device descriptor
+ * @xfers: Transfer array
+ * @nxfers: Number of transfers
+ *
+ * Handles address adjustment and forwards private transfers through the hub
+ * device.
+ */
+static int i3c_hub_master_priv_xfers(struct i3c_dev_desc *dev,
+ struct i3c_xfer *xfers,
+ int nxfers,
+ enum i3c_xfer_mode mode)
+{
+ struct i3c_master_controller *controller = i3c_dev_get_master(dev);
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_dev_desc *hub_dev;
+ u8 hub_addr, target_addr;
+ struct i3c_hub *hub;
+ int ret;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return -ENODEV;
+
+ hub = hub_controller->hub;
+
+ if (!hub->hub_dev)
+ return -ENODEV;
+
+ hub_dev = hub->hub_dev->desc;
+
+ i3c_hub_enable_port(controller);
+
+ hub_addr = hub_dev->info.dyn_addr ?
+ hub_dev->info.dyn_addr : hub_dev->info.static_addr;
+
+ target_addr = dev->info.dyn_addr ?
+ dev->info.dyn_addr : dev->info.static_addr;
+
+ if (hub_addr != target_addr) {
+ hub_dev->info.dyn_addr = target_addr;
+ ret = i3c_master_reattach_i3c_dev(hub_dev, target_addr);
+ if (ret)
+ goto disable;
+ }
+
+ ret = i3c_device_do_xfers(hub->hub_dev, xfers, nxfers, mode);
+
+ if (hub_addr != target_addr) {
+ hub_dev->info.dyn_addr = hub_addr;
+ ret |= i3c_master_reattach_i3c_dev(hub_dev, hub_addr);
+ }
+
+disable:
+ i3c_hub_disable_port(controller);
+ return ret;
+}
+
+static int i3c_hub_attach_i2c_dev(struct i2c_dev_desc *dev)
+{
+ return 0;
+}
+
+static void i3c_hub_detach_i2c_dev(struct i2c_dev_desc *dev)
+{
+}
+
+static int i3c_hub_i2c_xfers(struct i2c_dev_desc *dev,
+ struct i2c_msg *xfers, int nxfers)
+{
+ return 0;
+}
+
+static int i3c_hub_master_do_daa(struct i3c_master_controller *controller)
+{
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_hub *hub;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return -ENODEV;
+
+ hub = hub_controller->hub;
+
+ return i3c_hub_do_daa(hub, controller);
+}
+
+static int i3c_hub_master_send_ccc_cmd(struct i3c_master_controller *controller,
+ struct i3c_ccc_cmd *cmd)
+{
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_hub *hub;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return -ENODEV;
+
+ hub = hub_controller->hub;
+
+ if (!hub->parent)
+ return -ENODEV;
+
+ if (cmd->id == I3C_CCC_RSTDAA(true))
+ return 0;
+
+ return i3c_hub_send_ccc_cmd(hub, controller, cmd);
+}
+
+static bool i3c_hub_master_supports_ccc_cmd(struct i3c_master_controller *controller,
+ const struct i3c_ccc_cmd *cmd)
+{
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_hub *hub;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return -ENODEV;
+
+ hub = hub_controller->hub;
+
+ return i3c_hub_supports_ccc_cmd(hub, cmd);
+}
+
+/**
+ * i3c_hub_request_ibi() - Request IBI through parent controller
+ * @desc: Target device descriptor
+ * @req: IBI setup
+ *
+ * Temporarily updates parent controller context to request IBI for a device
+ * connected through the hub.
+ */
+static int i3c_hub_request_ibi(struct i3c_dev_desc *desc,
+ const struct i3c_ibi_setup *req)
+{
+ struct i3c_master_controller *controller = i3c_dev_get_master(desc);
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_master_controller *orig_parent;
+ struct i3c_master_controller *parent;
+ struct i3c_hub *hub;
+ int ret;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return -ENODEV;
+
+ hub = hub_controller->hub;
+
+ if (!hub->parent)
+ return -ENODEV;
+
+ parent = hub->parent;
+
+ orig_parent = i3c_hub_update_desc_parent(&desc->common, parent);
+
+ ret = i3c_master_direct_attach_i3c_dev(parent, desc);
+ if (ret) {
+ i3c_hub_restore_desc_parent(&desc->common, orig_parent);
+ return ret;
+ }
+
+ mutex_unlock(&desc->ibi_lock);
+ kfree(desc->ibi);
+ desc->ibi = NULL;
+ ret = i3c_dev_request_ibi_locked(desc, req);
+ mutex_lock(&desc->ibi_lock);
+
+ i3c_hub_restore_desc_parent(&desc->common, orig_parent);
+
+ return ret;
+}
+
+static void i3c_hub_free_ibi(struct i3c_dev_desc *desc)
+{
+ struct i3c_master_controller *controller = i3c_dev_get_master(desc);
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_master_controller *orig_parent;
+ struct i3c_master_controller *parent;
+ struct i3c_hub *hub;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return;
+
+ hub = hub_controller->hub;
+
+ parent = hub->parent;
+
+ i3c_hub_enable_port(controller);
+
+ orig_parent = i3c_hub_update_desc_parent(&desc->common, parent);
+ i3c_master_direct_detach_i3c_dev(desc);
+ mutex_unlock(&desc->ibi_lock);
+ i3c_dev_free_ibi_locked(desc);
+ mutex_lock(&desc->ibi_lock);
+ i3c_hub_restore_desc_parent(&desc->common, orig_parent);
+
+ i3c_hub_disable_port(controller);
+}
+
+/**
+ * i3c_hub_enable_ibi() - Enable IBI via hub port
+ * @desc: Target device descriptor
+ *
+ * Enables port connection and forwards the IBI enable request to the parent
+ * controller.
+ */
+static int i3c_hub_enable_ibi(struct i3c_dev_desc *desc)
+{
+ struct i3c_master_controller *controller = i3c_dev_get_master(desc);
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_master_controller *orig_parent;
+ struct i3c_master_controller *parent;
+ struct i3c_hub *hub;
+ int ret;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return -ENODEV;
+
+ hub = hub_controller->hub;
+
+ if (!hub->parent)
+ return -ENODEV;
+
+ parent = hub->parent;
+
+ i3c_hub_enable_port(controller);
+
+ orig_parent = i3c_hub_update_desc_parent(&desc->common, parent);
+
+ down_write(&parent->bus.lock);
+ mutex_unlock(&desc->ibi_lock);
+ ret = i3c_dev_enable_ibi_locked(desc);
+ mutex_lock(&desc->ibi_lock);
+ up_write(&parent->bus.lock);
+
+ i3c_hub_restore_desc_parent(&desc->common, orig_parent);
+
+ i3c_hub_disable_port(controller);
+
+ return ret;
+}
+
+/**
+ * i3c_hub_disable_ibi() - Disable IBI via hub port
+ * @desc: Target device descriptor
+ *
+ * Enables port connection and forwards the IBI disable request to the parent
+ * controller.
+ */
+static int i3c_hub_disable_ibi(struct i3c_dev_desc *desc)
+{
+ struct i3c_master_controller *controller = i3c_dev_get_master(desc);
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_master_controller *orig_parent;
+ struct i3c_master_controller *parent;
+ struct i3c_hub *hub;
+ int ret;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return -ENODEV;
+
+ hub = hub_controller->hub;
+
+ if (!hub->parent)
+ return -ENODEV;
+
+ parent = hub->parent;
+
+ i3c_hub_enable_port(controller);
+
+ orig_parent = i3c_hub_update_desc_parent(&desc->common, parent);
+
+ down_write(&parent->bus.lock);
+ mutex_unlock(&desc->ibi_lock);
+ ret = i3c_dev_disable_ibi_locked(desc);
+ mutex_lock(&desc->ibi_lock);
+ up_write(&parent->bus.lock);
+
+ i3c_hub_restore_desc_parent(&desc->common, orig_parent);
+
+ i3c_hub_disable_port(controller);
+
+ return ret;
+}
+
+static void i3c_hub_recycle_ibi_slot(struct i3c_dev_desc *desc,
+ struct i3c_ibi_slot *slot)
+{
+}
+
+static const struct i3c_master_controller_ops i3c_hub_master_ops_data = {
+ .bus_init = i3c_hub_master_bus_init,
+ .bus_cleanup = i3c_hub_master_bus_cleanup,
+ .attach_i3c_dev = i3c_hub_attach_i3c_dev,
+ .reattach_i3c_dev = i3c_hub_reattach_i3c_dev,
+ .detach_i3c_dev = i3c_hub_detach_i3c_dev,
+ .do_daa = i3c_hub_master_do_daa,
+ .supports_ccc_cmd = i3c_hub_master_supports_ccc_cmd,
+ .send_ccc_cmd = i3c_hub_master_send_ccc_cmd,
+ .i3c_xfers = i3c_hub_master_priv_xfers,
+ .attach_i2c_dev = i3c_hub_attach_i2c_dev,
+ .detach_i2c_dev = i3c_hub_detach_i2c_dev,
+ .i2c_xfers = i3c_hub_i2c_xfers,
+ .request_ibi = i3c_hub_request_ibi,
+ .free_ibi = i3c_hub_free_ibi,
+ .enable_ibi = i3c_hub_enable_ibi,
+ .disable_ibi = i3c_hub_disable_ibi,
+ .recycle_ibi_slot = i3c_hub_recycle_ibi_slot,
+};
+
+/**
+ * i3c_hub_init() - Initialize hub context
+ * @hub: Hub instance
+ * @parent: Parent I3C master controller
+ * @ops: Vendor callbacks
+ * @hub_dev: I3C hub device
+ */
+struct i3c_hub *i3c_hub_init(struct i3c_master_controller *parent,
+ const struct i3c_hub_ops *ops,
+ struct i3c_device *hub_dev)
+{
+ struct i3c_hub *hub;
+
+ hub = devm_kzalloc(&hub_dev->dev,
+ sizeof(*hub),
+ GFP_KERNEL);
+
+ if (!hub)
+ return ERR_PTR(-ENOMEM);
+
+ hub->parent = parent;
+ hub->ops = ops;
+ hub->hub_dev = hub_dev;
+
+ return hub;
+}
+EXPORT_SYMBOL_GPL(i3c_hub_init);
+
+const struct i3c_master_controller_ops *i3c_hub_master_ops(void)
+{
+ return &i3c_hub_master_ops_data;
+}
+EXPORT_SYMBOL_GPL(i3c_hub_master_ops);
+
+MODULE_AUTHOR("Aman Kumar Pandey <aman.kumarpandey@nxp.com>");
+MODULE_AUTHOR("Vikash Bansal <vikash.bansal@nxp.com>");
+MODULE_AUTHOR("Lakshay Piplani <lakshay.piplani@nxp.com>");
+MODULE_DESCRIPTION("Generic I3C hub support");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/i3c/hub.h b/include/linux/i3c/hub.h
new file mode 100644
index 000000000000..b685d4d3cc7e
--- /dev/null
+++ b/include/linux/i3c/hub.h
@@ -0,0 +1,107 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2026 NXP
+ * Generic hub definitions and helper interfaces.
+ */
+#ifndef _LINUX_I3C_HUB_H
+#define _LINUX_I3C_HUB_H
+
+#include <linux/i3c/master.h>
+
+static inline struct i3c_master_controller *
+i3c_hub_update_desc_parent(struct i3c_i2c_dev_desc *desc,
+ struct i3c_master_controller *parent)
+{
+ struct i3c_master_controller *orig_parent = desc->master;
+
+ desc->master = parent;
+ return orig_parent;
+}
+
+static inline void
+i3c_hub_restore_desc_parent(struct i3c_i2c_dev_desc *desc,
+ struct i3c_master_controller *parent)
+{
+ desc->master = parent;
+}
+
+/**
+ * struct i3c_hub - Generic I3C hub context
+ * @parent: Parent I3C master controller
+ * @ops: Vendor callbacks for port connection control
+ * @hub_dev: I3C device representing the hub on the parent bus
+ */
+struct i3c_hub {
+ struct i3c_master_controller *parent;
+ const struct i3c_hub_ops *ops;
+ struct i3c_device *hub_dev;
+};
+
+struct i3c_hub_controller {
+ struct i3c_master_controller *parent;
+ struct i3c_master_controller controller;
+ struct i3c_hub *hub;
+};
+
+struct i3c_hub_ops {
+ void (*enable_port)(struct i3c_master_controller *controller);
+ void (*disable_port)(struct i3c_master_controller *controller);
+};
+
+/**
+ * i3c_hub_enable_port() - Enable hub connection for a controller
+ * @controller: Virtual controller representing a hub port
+ *
+ * Retrieves hub context from controller drvdata and invokes the vendor
+ * callback to enable the associated port connection.
+ */
+static inline void i3c_hub_enable_port(struct i3c_master_controller *controller)
+{
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_hub *hub;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return;
+
+ hub = hub_controller->hub;
+
+ if (hub && hub->ops && hub->ops->enable_port)
+ hub->ops->enable_port(controller);
+}
+
+/**
+ * i3c_hub_disable_port() - Disable hub connection for a controller
+ * @controller: Virtual controller representing a hub port
+ *
+ * Retrieves hub context from controller drvdata and invokes the vendor
+ * callback to disable the associated port connection.
+ */
+static inline void i3c_hub_disable_port(struct i3c_master_controller *controller)
+{
+ struct i3c_hub_controller *hub_controller;
+ struct i3c_hub *hub;
+
+ hub_controller = dev_get_drvdata(&controller->dev);
+ if (!hub_controller || !hub_controller->hub)
+ return;
+
+ hub = hub_controller->hub;
+
+ if (hub && hub->ops && hub->ops->disable_port)
+ hub->ops->disable_port(controller);
+}
+
+/**
+ * i3c_hub_master_ops() - Return virtual controller ops for hub ports
+ *
+ * Provides i3c_master_controller_ops used by controllers created for hub
+ * ports.
+ */
+const struct i3c_master_controller_ops *i3c_hub_master_ops(void);
+
+struct i3c_hub *i3c_hub_init(struct i3c_master_controller *parent,
+ const struct i3c_hub_ops *ops,
+ struct i3c_device *hub_dev);
+
+#endif
--
2.25.1
^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub
2026-03-10 6:57 ` [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub Lakshay Piplani
@ 2026-03-10 9:11 ` Jorge Marques
2026-03-10 9:25 ` Jorge Marques
` (2 subsequent siblings)
3 siblings, 0 replies; 26+ messages in thread
From: Jorge Marques @ 2026-03-10 9:11 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood,
vikash.bansal, priyanka.jain, aman.kumarpandey
On Tue, Mar 10, 2026 at 12:27:26PM +0530, Lakshay Piplani wrote:
> Add virtual I3C bus support for the hub and provide interface to enable
> or disable downstream ports.
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
> Signed-off-by: Lakshay Piplani <lakshay.piplani@nxp.com>
>
> ---
> Changes in v6:
> - Add support for the generic I3C interface in the I3C Hub
> ---
> ---
> MAINTAINERS | 3 +
> drivers/i3c/Kconfig | 15 ++
> drivers/i3c/Makefile | 1 +
> drivers/i3c/hub.c | 459 ++++++++++++++++++++++++++++++++++++++++
> include/linux/i3c/hub.h | 107 ++++++++++
> 5 files changed, 585 insertions(+)
> create mode 100644 drivers/i3c/hub.c
> create mode 100644 include/linux/i3c/hub.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2fc44b489ea1..7613b4b59290 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19110,12 +19110,15 @@ F: drivers/ptp/ptp_netc.c
> NXP P3H2X4X I3C-HUB DRIVER
> M: Vikash Bansal <vikash.bansal@nxp.com>
> M: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> +M: Lakshay Piplani <lakshay.piplani@nxp.com>
> L: linux-kernel@vger.kernel.org
> L: linux-i3c-owner@lists.infradead.org
> S: Maintained
> F: Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
> +F: drivers/i3c/hub.c
> F: drivers/mfd/p3h2840.c
> F: drivers/regulator/p3h2840_i3c_hub_regulator.c
> +F: include/linux/i3c/hub.h
> F: include/linux/mfd/p3h2840.h
>
> NXP PF5300/PF5301/PF5302 PMIC REGULATOR DEVICE DRIVER
> diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig
> index 30a441506f61..889d781f099b 100644
> --- a/drivers/i3c/Kconfig
> +++ b/drivers/i3c/Kconfig
> @@ -21,4 +21,19 @@ menuconfig I3C
>
> if I3C
> source "drivers/i3c/master/Kconfig"
> +
> +config I3C_HUB
> + bool "I3C Hub Support"
> + depends on I3C
> + help
> + Enable support for the I3C interface in hub devices.
> +
> + This option adds virtual I3C bus support for hubs by creating
> + virtual master controllers for downstream ports and forwarding
> + bus operations through the hub device. It also provides an
> + interface used by hub drivers to enable or disable downstream
> + ports during bus transactions.
> +
> + Say Y here if your platform includes an I3C hub device
> +
> endif # I3C
Hi Aman, the i3c subsytem allows to be compiled as module, why your
driver doesn't (due to bool instead of tristate), this causes, when
I3C is a module:
arm-linux-ld: drivers/i3c/hub.o: in function `i3c_hub_request_ibi':
hub.c:(.text+0xec): undefined reference to `i3c_master_direct_attach_i3c_dev'
...
Can you force i3c built-in if hub is selected, or allow as a module?
Thanks,
Jorge
> diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile
> index 11982efbc6d9..9ddee56a6338 100644
> --- a/drivers/i3c/Makefile
> +++ b/drivers/i3c/Makefile
> @@ -2,3 +2,4 @@
> i3c-y := device.o master.o
> obj-$(CONFIG_I3C) += i3c.o
> obj-$(CONFIG_I3C) += master/
> +obj-$(CONFIG_I3C_HUB) += hub.o
> diff --git a/drivers/i3c/hub.c b/drivers/i3c/hub.c
> new file mode 100644
> index 000000000000..9cdea8635327
> --- /dev/null
> +++ b/drivers/i3c/hub.c
> @@ -0,0 +1,459 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2026 NXP
> + * Generic I3C Hub core implementing virtual controller operations.
> + */
> +#include <linux/i3c/device.h>
> +#include <linux/i3c/hub.h>
> +
> +#include "internals.h"
> +
> +/**
> + * i3c_hub_master_bus_init() - Bind controller to hub device
> + * @controller: Virtual controller for a hub port
> + *
> + * Associates the virtual controller with the hub device descriptor so that
> + * transfers are executed through the hub on the parent bus.
> + */
> +static int i3c_hub_master_bus_init(struct i3c_master_controller *controller)
> +{
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_hub *hub;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return -ENODEV;
> +
> + hub = hub_controller->hub;
> +
> + if (!hub->hub_dev)
> + return -ENODEV;
> +
> + controller->this = hub->hub_dev->desc;
> + return 0;
> +}
> +
> +static void i3c_hub_master_bus_cleanup(struct i3c_master_controller *controller)
> +{
> + controller->this = NULL;
> +}
> +
> +static int i3c_hub_attach_i3c_dev(struct i3c_dev_desc *dev)
> +{
> + return 0;
> +}
> +
> +static int i3c_hub_reattach_i3c_dev(struct i3c_dev_desc *dev, u8 old_dyn_addr)
> +{
> + return 0;
> +}
> +
> +static void i3c_hub_detach_i3c_dev(struct i3c_dev_desc *dev)
> +{
> +}
> +
> +/**
> + * i3c_hub_do_daa() - Perform DAA via hub port
> + * @hub: Hub instance
> + * @controller: Virtual controller for a hub port
> + *
> + * Enables the port connection, performs DAA on the parent controller,
> + * then disables the connection.
> + */
> +static int i3c_hub_do_daa(struct i3c_hub *hub,
> + struct i3c_master_controller *controller)
> +{
> + int ret;
> +
> + if (!hub || !hub->parent)
> + return -ENODEV;
> +
> + i3c_hub_enable_port(controller);
> + ret = i3c_master_do_daa(hub->parent);
> + i3c_hub_disable_port(controller);
> +
> + return ret;
> +}
> +
> +static bool i3c_hub_supports_ccc_cmd(struct i3c_hub *hub,
> + const struct i3c_ccc_cmd *cmd)
> +{
> + return i3c_master_supports_ccc_cmd(hub->parent, cmd);
> +}
> +
> +/**
> + * i3c_hub_send_ccc_cmd() - Send CCC through hub port
> + * @hub: Hub instance
> + * @controller: Virtual controller
> + * @cmd: CCC command
> + *
> + * Enables the port connection while issuing CCC on the parent controller.
> + */
> +static int i3c_hub_send_ccc_cmd(struct i3c_hub *hub,
> + struct i3c_master_controller *controller,
> + struct i3c_ccc_cmd *cmd)
> +{
> + int ret;
> +
> + if (!hub || !hub->parent)
> + return -ENODEV;
> +
> + i3c_hub_enable_port(controller);
> + ret = i3c_master_send_ccc_cmd(hub->parent, cmd);
> + i3c_hub_disable_port(controller);
> +
> + return ret;
> +}
> +
> +/**
> + * i3c_hub_master_priv_xfers() - Execute private transfers via hub
> + * @dev: Target device descriptor
> + * @xfers: Transfer array
> + * @nxfers: Number of transfers
> + *
> + * Handles address adjustment and forwards private transfers through the hub
> + * device.
> + */
> +static int i3c_hub_master_priv_xfers(struct i3c_dev_desc *dev,
> + struct i3c_xfer *xfers,
> + int nxfers,
> + enum i3c_xfer_mode mode)
> +{
> + struct i3c_master_controller *controller = i3c_dev_get_master(dev);
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_dev_desc *hub_dev;
> + u8 hub_addr, target_addr;
> + struct i3c_hub *hub;
> + int ret;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return -ENODEV;
> +
> + hub = hub_controller->hub;
> +
> + if (!hub->hub_dev)
> + return -ENODEV;
> +
> + hub_dev = hub->hub_dev->desc;
> +
> + i3c_hub_enable_port(controller);
> +
> + hub_addr = hub_dev->info.dyn_addr ?
> + hub_dev->info.dyn_addr : hub_dev->info.static_addr;
> +
> + target_addr = dev->info.dyn_addr ?
> + dev->info.dyn_addr : dev->info.static_addr;
> +
> + if (hub_addr != target_addr) {
> + hub_dev->info.dyn_addr = target_addr;
> + ret = i3c_master_reattach_i3c_dev(hub_dev, target_addr);
> + if (ret)
> + goto disable;
> + }
> +
> + ret = i3c_device_do_xfers(hub->hub_dev, xfers, nxfers, mode);
> +
> + if (hub_addr != target_addr) {
> + hub_dev->info.dyn_addr = hub_addr;
> + ret |= i3c_master_reattach_i3c_dev(hub_dev, hub_addr);
> + }
> +
> +disable:
> + i3c_hub_disable_port(controller);
> + return ret;
> +}
> +
> +static int i3c_hub_attach_i2c_dev(struct i2c_dev_desc *dev)
> +{
> + return 0;
> +}
> +
> +static void i3c_hub_detach_i2c_dev(struct i2c_dev_desc *dev)
> +{
> +}
> +
> +static int i3c_hub_i2c_xfers(struct i2c_dev_desc *dev,
> + struct i2c_msg *xfers, int nxfers)
> +{
> + return 0;
> +}
> +
> +static int i3c_hub_master_do_daa(struct i3c_master_controller *controller)
> +{
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_hub *hub;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return -ENODEV;
> +
> + hub = hub_controller->hub;
> +
> + return i3c_hub_do_daa(hub, controller);
> +}
> +
> +static int i3c_hub_master_send_ccc_cmd(struct i3c_master_controller *controller,
> + struct i3c_ccc_cmd *cmd)
> +{
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_hub *hub;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return -ENODEV;
> +
> + hub = hub_controller->hub;
> +
> + if (!hub->parent)
> + return -ENODEV;
> +
> + if (cmd->id == I3C_CCC_RSTDAA(true))
> + return 0;
> +
> + return i3c_hub_send_ccc_cmd(hub, controller, cmd);
> +}
> +
> +static bool i3c_hub_master_supports_ccc_cmd(struct i3c_master_controller *controller,
> + const struct i3c_ccc_cmd *cmd)
> +{
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_hub *hub;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return -ENODEV;
> +
> + hub = hub_controller->hub;
> +
> + return i3c_hub_supports_ccc_cmd(hub, cmd);
> +}
> +
> +/**
> + * i3c_hub_request_ibi() - Request IBI through parent controller
> + * @desc: Target device descriptor
> + * @req: IBI setup
> + *
> + * Temporarily updates parent controller context to request IBI for a device
> + * connected through the hub.
> + */
> +static int i3c_hub_request_ibi(struct i3c_dev_desc *desc,
> + const struct i3c_ibi_setup *req)
> +{
> + struct i3c_master_controller *controller = i3c_dev_get_master(desc);
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_master_controller *orig_parent;
> + struct i3c_master_controller *parent;
> + struct i3c_hub *hub;
> + int ret;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return -ENODEV;
> +
> + hub = hub_controller->hub;
> +
> + if (!hub->parent)
> + return -ENODEV;
> +
> + parent = hub->parent;
> +
> + orig_parent = i3c_hub_update_desc_parent(&desc->common, parent);
> +
> + ret = i3c_master_direct_attach_i3c_dev(parent, desc);
> + if (ret) {
> + i3c_hub_restore_desc_parent(&desc->common, orig_parent);
> + return ret;
> + }
> +
> + mutex_unlock(&desc->ibi_lock);
> + kfree(desc->ibi);
> + desc->ibi = NULL;
> + ret = i3c_dev_request_ibi_locked(desc, req);
> + mutex_lock(&desc->ibi_lock);
> +
> + i3c_hub_restore_desc_parent(&desc->common, orig_parent);
> +
> + return ret;
> +}
> +
> +static void i3c_hub_free_ibi(struct i3c_dev_desc *desc)
> +{
> + struct i3c_master_controller *controller = i3c_dev_get_master(desc);
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_master_controller *orig_parent;
> + struct i3c_master_controller *parent;
> + struct i3c_hub *hub;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return;
> +
> + hub = hub_controller->hub;
> +
> + parent = hub->parent;
> +
> + i3c_hub_enable_port(controller);
> +
> + orig_parent = i3c_hub_update_desc_parent(&desc->common, parent);
> + i3c_master_direct_detach_i3c_dev(desc);
> + mutex_unlock(&desc->ibi_lock);
> + i3c_dev_free_ibi_locked(desc);
> + mutex_lock(&desc->ibi_lock);
> + i3c_hub_restore_desc_parent(&desc->common, orig_parent);
> +
> + i3c_hub_disable_port(controller);
> +}
> +
> +/**
> + * i3c_hub_enable_ibi() - Enable IBI via hub port
> + * @desc: Target device descriptor
> + *
> + * Enables port connection and forwards the IBI enable request to the parent
> + * controller.
> + */
> +static int i3c_hub_enable_ibi(struct i3c_dev_desc *desc)
> +{
> + struct i3c_master_controller *controller = i3c_dev_get_master(desc);
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_master_controller *orig_parent;
> + struct i3c_master_controller *parent;
> + struct i3c_hub *hub;
> + int ret;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return -ENODEV;
> +
> + hub = hub_controller->hub;
> +
> + if (!hub->parent)
> + return -ENODEV;
> +
> + parent = hub->parent;
> +
> + i3c_hub_enable_port(controller);
> +
> + orig_parent = i3c_hub_update_desc_parent(&desc->common, parent);
> +
> + down_write(&parent->bus.lock);
> + mutex_unlock(&desc->ibi_lock);
> + ret = i3c_dev_enable_ibi_locked(desc);
> + mutex_lock(&desc->ibi_lock);
> + up_write(&parent->bus.lock);
> +
> + i3c_hub_restore_desc_parent(&desc->common, orig_parent);
> +
> + i3c_hub_disable_port(controller);
> +
> + return ret;
> +}
> +
> +/**
> + * i3c_hub_disable_ibi() - Disable IBI via hub port
> + * @desc: Target device descriptor
> + *
> + * Enables port connection and forwards the IBI disable request to the parent
> + * controller.
> + */
> +static int i3c_hub_disable_ibi(struct i3c_dev_desc *desc)
> +{
> + struct i3c_master_controller *controller = i3c_dev_get_master(desc);
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_master_controller *orig_parent;
> + struct i3c_master_controller *parent;
> + struct i3c_hub *hub;
> + int ret;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return -ENODEV;
> +
> + hub = hub_controller->hub;
> +
> + if (!hub->parent)
> + return -ENODEV;
> +
> + parent = hub->parent;
> +
> + i3c_hub_enable_port(controller);
> +
> + orig_parent = i3c_hub_update_desc_parent(&desc->common, parent);
> +
> + down_write(&parent->bus.lock);
> + mutex_unlock(&desc->ibi_lock);
> + ret = i3c_dev_disable_ibi_locked(desc);
> + mutex_lock(&desc->ibi_lock);
> + up_write(&parent->bus.lock);
> +
> + i3c_hub_restore_desc_parent(&desc->common, orig_parent);
> +
> + i3c_hub_disable_port(controller);
> +
> + return ret;
> +}
> +
> +static void i3c_hub_recycle_ibi_slot(struct i3c_dev_desc *desc,
> + struct i3c_ibi_slot *slot)
> +{
> +}
> +
> +static const struct i3c_master_controller_ops i3c_hub_master_ops_data = {
> + .bus_init = i3c_hub_master_bus_init,
> + .bus_cleanup = i3c_hub_master_bus_cleanup,
> + .attach_i3c_dev = i3c_hub_attach_i3c_dev,
> + .reattach_i3c_dev = i3c_hub_reattach_i3c_dev,
> + .detach_i3c_dev = i3c_hub_detach_i3c_dev,
> + .do_daa = i3c_hub_master_do_daa,
> + .supports_ccc_cmd = i3c_hub_master_supports_ccc_cmd,
> + .send_ccc_cmd = i3c_hub_master_send_ccc_cmd,
> + .i3c_xfers = i3c_hub_master_priv_xfers,
> + .attach_i2c_dev = i3c_hub_attach_i2c_dev,
> + .detach_i2c_dev = i3c_hub_detach_i2c_dev,
> + .i2c_xfers = i3c_hub_i2c_xfers,
> + .request_ibi = i3c_hub_request_ibi,
> + .free_ibi = i3c_hub_free_ibi,
> + .enable_ibi = i3c_hub_enable_ibi,
> + .disable_ibi = i3c_hub_disable_ibi,
> + .recycle_ibi_slot = i3c_hub_recycle_ibi_slot,
> +};
> +
> +/**
> + * i3c_hub_init() - Initialize hub context
> + * @hub: Hub instance
> + * @parent: Parent I3C master controller
> + * @ops: Vendor callbacks
> + * @hub_dev: I3C hub device
> + */
> +struct i3c_hub *i3c_hub_init(struct i3c_master_controller *parent,
> + const struct i3c_hub_ops *ops,
> + struct i3c_device *hub_dev)
> +{
> + struct i3c_hub *hub;
> +
> + hub = devm_kzalloc(&hub_dev->dev,
> + sizeof(*hub),
> + GFP_KERNEL);
> +
> + if (!hub)
> + return ERR_PTR(-ENOMEM);
> +
> + hub->parent = parent;
> + hub->ops = ops;
> + hub->hub_dev = hub_dev;
> +
> + return hub;
> +}
> +EXPORT_SYMBOL_GPL(i3c_hub_init);
> +
> +const struct i3c_master_controller_ops *i3c_hub_master_ops(void)
> +{
> + return &i3c_hub_master_ops_data;
> +}
> +EXPORT_SYMBOL_GPL(i3c_hub_master_ops);
> +
> +MODULE_AUTHOR("Aman Kumar Pandey <aman.kumarpandey@nxp.com>");
> +MODULE_AUTHOR("Vikash Bansal <vikash.bansal@nxp.com>");
> +MODULE_AUTHOR("Lakshay Piplani <lakshay.piplani@nxp.com>");
> +MODULE_DESCRIPTION("Generic I3C hub support");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/i3c/hub.h b/include/linux/i3c/hub.h
> new file mode 100644
> index 000000000000..b685d4d3cc7e
> --- /dev/null
> +++ b/include/linux/i3c/hub.h
> @@ -0,0 +1,107 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2026 NXP
> + * Generic hub definitions and helper interfaces.
> + */
> +#ifndef _LINUX_I3C_HUB_H
> +#define _LINUX_I3C_HUB_H
> +
> +#include <linux/i3c/master.h>
> +
> +static inline struct i3c_master_controller *
> +i3c_hub_update_desc_parent(struct i3c_i2c_dev_desc *desc,
> + struct i3c_master_controller *parent)
> +{
> + struct i3c_master_controller *orig_parent = desc->master;
> +
> + desc->master = parent;
> + return orig_parent;
> +}
> +
> +static inline void
> +i3c_hub_restore_desc_parent(struct i3c_i2c_dev_desc *desc,
> + struct i3c_master_controller *parent)
> +{
> + desc->master = parent;
> +}
> +
> +/**
> + * struct i3c_hub - Generic I3C hub context
> + * @parent: Parent I3C master controller
> + * @ops: Vendor callbacks for port connection control
> + * @hub_dev: I3C device representing the hub on the parent bus
> + */
> +struct i3c_hub {
> + struct i3c_master_controller *parent;
> + const struct i3c_hub_ops *ops;
> + struct i3c_device *hub_dev;
> +};
> +
> +struct i3c_hub_controller {
> + struct i3c_master_controller *parent;
> + struct i3c_master_controller controller;
> + struct i3c_hub *hub;
> +};
> +
> +struct i3c_hub_ops {
> + void (*enable_port)(struct i3c_master_controller *controller);
> + void (*disable_port)(struct i3c_master_controller *controller);
> +};
> +
> +/**
> + * i3c_hub_enable_port() - Enable hub connection for a controller
> + * @controller: Virtual controller representing a hub port
> + *
> + * Retrieves hub context from controller drvdata and invokes the vendor
> + * callback to enable the associated port connection.
> + */
> +static inline void i3c_hub_enable_port(struct i3c_master_controller *controller)
> +{
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_hub *hub;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return;
> +
> + hub = hub_controller->hub;
> +
> + if (hub && hub->ops && hub->ops->enable_port)
> + hub->ops->enable_port(controller);
> +}
> +
> +/**
> + * i3c_hub_disable_port() - Disable hub connection for a controller
> + * @controller: Virtual controller representing a hub port
> + *
> + * Retrieves hub context from controller drvdata and invokes the vendor
> + * callback to disable the associated port connection.
> + */
> +static inline void i3c_hub_disable_port(struct i3c_master_controller *controller)
> +{
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_hub *hub;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return;
> +
> + hub = hub_controller->hub;
> +
> + if (hub && hub->ops && hub->ops->disable_port)
> + hub->ops->disable_port(controller);
> +}
> +
> +/**
> + * i3c_hub_master_ops() - Return virtual controller ops for hub ports
> + *
> + * Provides i3c_master_controller_ops used by controllers created for hub
> + * ports.
> + */
> +const struct i3c_master_controller_ops *i3c_hub_master_ops(void);
> +
> +struct i3c_hub *i3c_hub_init(struct i3c_master_controller *parent,
> + const struct i3c_hub_ops *ops,
> + struct i3c_device *hub_dev);
> +
> +#endif
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub
2026-03-10 6:57 ` [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub Lakshay Piplani
2026-03-10 9:11 ` Jorge Marques
@ 2026-03-10 9:25 ` Jorge Marques
2026-03-10 20:21 ` kernel test robot
2026-03-11 0:59 ` kernel test robot
3 siblings, 0 replies; 26+ messages in thread
From: Jorge Marques @ 2026-03-10 9:25 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood,
vikash.bansal, priyanka.jain, aman.kumarpandey
On Tue, Mar 10, 2026 at 12:27:26PM +0530, Lakshay Piplani wrote:
> Add virtual I3C bus support for the hub and provide interface to enable
> or disable downstream ports.
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
> Signed-off-by: Lakshay Piplani <lakshay.piplani@nxp.com>
>
> ---
> Changes in v6:
> - Add support for the generic I3C interface in the I3C Hub
> ---
> ---
> MAINTAINERS | 3 +
> drivers/i3c/Kconfig | 15 ++
> drivers/i3c/Makefile | 1 +
> drivers/i3c/hub.c | 459 ++++++++++++++++++++++++++++++++++++++++
> include/linux/i3c/hub.h | 107 ++++++++++
> 5 files changed, 585 insertions(+)
> create mode 100644 drivers/i3c/hub.c
> create mode 100644 include/linux/i3c/hub.h
>
> diff --git a/drivers/i3c/hub.c b/drivers/i3c/hub.c
> new file mode 100644
> index 000000000000..9cdea8635327
> --- /dev/null
> +++ b/drivers/i3c/hub.c
> @@ -0,0 +1,459 @@
Hi Aman,
> +static bool i3c_hub_master_supports_ccc_cmd(struct i3c_master_controller *controller,
> + const struct i3c_ccc_cmd *cmd)
> +{
> + struct i3c_hub_controller *hub_controller;
> + struct i3c_hub *hub;
> +
> + hub_controller = dev_get_drvdata(&controller->dev);
> + if (!hub_controller || !hub_controller->hub)
> + return -ENODEV;
> +
This method returns a bool, this is a signedness bug.
Regards,
Jorge
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub
2026-03-10 6:57 ` [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub Lakshay Piplani
2026-03-10 9:11 ` Jorge Marques
2026-03-10 9:25 ` Jorge Marques
@ 2026-03-10 20:21 ` kernel test robot
2026-03-11 0:59 ` kernel test robot
3 siblings, 0 replies; 26+ messages in thread
From: kernel test robot @ 2026-03-10 20:21 UTC (permalink / raw)
To: Lakshay Piplani, linux-kernel, linux-i3c, alexandre.belloni,
krzk+dt, robh, conor+dt, devicetree, broonie, lee, Frank.Li,
lgirdwood
Cc: oe-kbuild-all, vikash.bansal, priyanka.jain, aman.kumarpandey,
lakshay.piplani
Hi Lakshay,
kernel test robot noticed the following build warnings:
[auto build test WARNING on i3c/i3c/next]
[also build test WARNING on lee-mfd/for-mfd-next broonie-regulator/for-next linus/master v7.0-rc3 next-20260309]
[cannot apply to lee-mfd/for-mfd-fixes]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lakshay-Piplani/i3c-master-Add-the-APIs-to-support-I3C-hub/20260310-150040
base: https://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux.git i3c/next
patch link: https://lore.kernel.org/r/20260310065727.3759342-6-lakshay.piplani%40nxp.com
patch subject: [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub
config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20260311/202603110450.w8GEwjjv-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260311/202603110450.w8GEwjjv-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603110450.w8GEwjjv-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> Warning: drivers/i3c/hub.c:120 function parameter 'mode' not described in 'i3c_hub_master_priv_xfers'
>> Warning: drivers/i3c/hub.c:120 function parameter 'mode' not described in 'i3c_hub_master_priv_xfers'
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub
2026-03-10 6:57 ` [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub Lakshay Piplani
` (2 preceding siblings ...)
2026-03-10 20:21 ` kernel test robot
@ 2026-03-11 0:59 ` kernel test robot
3 siblings, 0 replies; 26+ messages in thread
From: kernel test robot @ 2026-03-11 0:59 UTC (permalink / raw)
To: Lakshay Piplani, linux-kernel, linux-i3c, alexandre.belloni,
krzk+dt, robh, conor+dt, devicetree, broonie, lee, Frank.Li,
lgirdwood
Cc: oe-kbuild-all, vikash.bansal, priyanka.jain, aman.kumarpandey,
lakshay.piplani
Hi Lakshay,
kernel test robot noticed the following build errors:
[auto build test ERROR on i3c/i3c/next]
[also build test ERROR on lee-mfd/for-mfd-next broonie-regulator/for-next linus/master v7.0-rc3 next-20260310]
[cannot apply to lee-mfd/for-mfd-fixes]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lakshay-Piplani/i3c-master-Add-the-APIs-to-support-I3C-hub/20260310-150040
base: https://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux.git i3c/next
patch link: https://lore.kernel.org/r/20260310065727.3759342-6-lakshay.piplani%40nxp.com
patch subject: [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub
config: s390-randconfig-001-20260311 (https://download.01.org/0day-ci/archive/20260311/202603110810.eZLkgGbx-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260311/202603110810.eZLkgGbx-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603110810.eZLkgGbx-lkp@intel.com/
All errors (new ones prefixed by >>):
s390-linux-ld: drivers/i3c/hub.o: in function `i3c_hub_disable_ibi':
>> hub.c:(.text+0x344): undefined reference to `i3c_dev_disable_ibi_locked'
s390-linux-ld: drivers/i3c/hub.o: in function `i3c_hub_enable_ibi':
>> hub.c:(.text+0x43c): undefined reference to `i3c_dev_enable_ibi_locked'
s390-linux-ld: drivers/i3c/hub.o: in function `i3c_hub_free_ibi':
>> hub.c:(.text+0x508): undefined reference to `i3c_master_direct_detach_i3c_dev'
>> s390-linux-ld: hub.c:(.text+0x51c): undefined reference to `i3c_dev_free_ibi_locked'
s390-linux-ld: drivers/i3c/hub.o: in function `i3c_hub_request_ibi':
>> hub.c:(.text+0x5e2): undefined reference to `i3c_master_direct_attach_i3c_dev'
>> s390-linux-ld: hub.c:(.text+0x644): undefined reference to `i3c_dev_request_ibi_locked'
s390-linux-ld: drivers/i3c/hub.o: in function `i3c_hub_master_priv_xfers':
>> hub.c:(.text+0x78e): undefined reference to `i3c_device_do_xfers'
>> s390-linux-ld: hub.c:(.text+0x7b8): undefined reference to `i3c_master_reattach_i3c_dev'
s390-linux-ld: hub.c:(.text+0x7d2): undefined reference to `i3c_master_reattach_i3c_dev'
s390-linux-ld: drivers/i3c/hub.o: in function `i3c_hub_master_send_ccc_cmd':
>> hub.c:(.text+0x88c): undefined reference to `i3c_master_send_ccc_cmd'
s390-linux-ld: drivers/i3c/hub.o: in function `i3c_hub_master_do_daa':
>> hub.c:(.text+0x92a): undefined reference to `i3c_master_do_daa'
s390-linux-ld: drivers/i3c/hub.o: in function `i3c_hub_master_supports_ccc_cmd':
>> hub.c:(.text+0x9ae): undefined reference to `i3c_master_supports_ccc_cmd'
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality
2026-03-10 6:57 [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub Lakshay Piplani
` (4 preceding siblings ...)
2026-03-10 6:57 ` [PATCH v6 6/7] i3c: hub: Add support for the I3C interface in the I3C hub Lakshay Piplani
@ 2026-03-10 6:57 ` Lakshay Piplani
2026-03-10 9:07 ` Lee Jones
` (3 more replies)
2026-03-10 14:40 ` [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub kernel test robot
2026-03-10 16:46 ` Frank Li
7 siblings, 4 replies; 26+ messages in thread
From: Lakshay Piplani @ 2026-03-10 6:57 UTC (permalink / raw)
To: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, Frank.Li, lgirdwood
Cc: vikash.bansal, priyanka.jain, aman.kumarpandey, lakshay.piplani
From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
Add I3C hub functionality for the NXP P3H2x4x family of multiport hubs.
These devices support downstream target ports that can be configured
as I3C, I2C, or SMBus.
This driver enables:
- I3C/I2C communication between host and hub
- Transparent communication with downstream devices
- Target port configuration (I3C/I2C/SMBus)
- MCTP device support
- In-band interrupt handling
P3H2440/P3H2441 support 4 target ports.
P3H2840/P3H2841 support 8 target ports.
Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
Signed-off-by: Lakshay Piplani <lakshay.piplani@nxp.com>
---
Changes in v6:
- Remove generic I3C code and keep reg dependent code only.
Changes in v5:
- Updated supply names.
Changes in v4:
- Split the driver into three separate patches (mfd, regulator and I3C hub)
- Added support for NXP P3H2x4x I3C hub functionality
- Integrated hub driver with its on-die regulator
Changes in v3:
- Added MFD (Multi-Function Device) support for I3C hub and on-die regulator
Changes in v2:
- Refined coding style and incorporated review feedback
- Updated directory structure
- Revised logic for parsing DTS nodes
---
---
MAINTAINERS | 1 +
drivers/i3c/Kconfig | 1 +
drivers/i3c/Makefile | 1 +
drivers/i3c/hub/Kconfig | 11 +
drivers/i3c/hub/Makefile | 4 +
drivers/i3c/hub/p3h2840_i3c_hub.h | 342 ++++++++++++++++++
drivers/i3c/hub/p3h2840_i3c_hub_common.c | 398 +++++++++++++++++++++
drivers/i3c/hub/p3h2840_i3c_hub_i3c.c | 119 +++++++
drivers/i3c/hub/p3h2840_i3c_hub_smbus.c | 423 +++++++++++++++++++++++
include/linux/i3c/device.h | 1 +
10 files changed, 1301 insertions(+)
create mode 100644 drivers/i3c/hub/Kconfig
create mode 100644 drivers/i3c/hub/Makefile
create mode 100644 drivers/i3c/hub/p3h2840_i3c_hub.h
create mode 100644 drivers/i3c/hub/p3h2840_i3c_hub_common.c
create mode 100644 drivers/i3c/hub/p3h2840_i3c_hub_i3c.c
create mode 100644 drivers/i3c/hub/p3h2840_i3c_hub_smbus.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 7613b4b59290..0ffd1a8183fd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19116,6 +19116,7 @@ L: linux-i3c-owner@lists.infradead.org
S: Maintained
F: Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
F: drivers/i3c/hub.c
+F: drivers/i3c/hub/*
F: drivers/mfd/p3h2840.c
F: drivers/regulator/p3h2840_i3c_hub_regulator.c
F: include/linux/i3c/hub.h
diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig
index 889d781f099b..972ba9aa2d55 100644
--- a/drivers/i3c/Kconfig
+++ b/drivers/i3c/Kconfig
@@ -36,4 +36,5 @@ config I3C_HUB
Say Y here if your platform includes an I3C hub device
+source "drivers/i3c/hub/Kconfig"
endif # I3C
diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile
index 9ddee56a6338..cf165cb75786 100644
--- a/drivers/i3c/Makefile
+++ b/drivers/i3c/Makefile
@@ -3,3 +3,4 @@ i3c-y := device.o master.o
obj-$(CONFIG_I3C) += i3c.o
obj-$(CONFIG_I3C) += master/
obj-$(CONFIG_I3C_HUB) += hub.o
+obj-$(CONFIG_I3C) += hub/
diff --git a/drivers/i3c/hub/Kconfig b/drivers/i3c/hub/Kconfig
new file mode 100644
index 000000000000..93eca168e764
--- /dev/null
+++ b/drivers/i3c/hub/Kconfig
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright 2025 NXP
+config P3H2X4X_I3C_HUB
+ tristate "P3H2X4X I3C HUB support"
+ depends on MFD_P3H2X4X
+ select I3C_HUB
+ help
+ This enables support for NXP P3H244x/P3H284x I3C HUB. These hubs
+ connect to a host via I3C/I2C/SMBus and allow communication with
+ multiple downstream peripherals. The Say Y or M here to use I3C
+ HUB driver to configure I3C HUB device.
diff --git a/drivers/i3c/hub/Makefile b/drivers/i3c/hub/Makefile
new file mode 100644
index 000000000000..9dbd8a7b4184
--- /dev/null
+++ b/drivers/i3c/hub/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright 2025 NXP
+p3h2840_i3c_hub-y := p3h2840_i3c_hub_common.o p3h2840_i3c_hub_i3c.o p3h2840_i3c_hub_smbus.o
+obj-$(CONFIG_P3H2X4X_I3C_HUB) += p3h2840_i3c_hub.o
diff --git a/drivers/i3c/hub/p3h2840_i3c_hub.h b/drivers/i3c/hub/p3h2840_i3c_hub.h
new file mode 100644
index 000000000000..ce19deec8752
--- /dev/null
+++ b/drivers/i3c/hub/p3h2840_i3c_hub.h
@@ -0,0 +1,342 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2025-2026 NXP
+ * This header file contain private device structure definition.
+ */
+
+#ifndef P3H2840_I3C_HUB_H
+#define P3H2840_I3C_HUB_H
+
+#include <linux/bitfield.h>
+#include <linux/i2c.h>
+#include <linux/i3c/device.h>
+#include <linux/i3c/hub.h>
+#include <linux/i3c/master.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regmap.h>
+
+/* I3C HUB REGISTERS */
+
+/* Device Information Registers */
+#define P3H2x4x_DEV_INFO_0 0x00
+#define P3H2x4x_DEV_INFO_1 0x01
+#define P3H2x4x_PID_5 0x02
+#define P3H2x4x_PID_4 0x03
+#define P3H2x4x_PID_3 0x04
+#define P3H2x4x_PID_2 0x05
+#define P3H2x4x_PID_1 0x06
+#define P3H2x4x_PID_0 0x07
+#define P3H2x4x_BCR 0x08
+#define P3H2x4x_DCR 0x09
+#define P3H2x4x_DEV_CAPAB 0x0a
+#define P3H2x4x_DEV_REV 0x0b
+
+/* Device Configuration Registers */
+#define P3H2x4x_CP_CONF 0x11
+#define P3H2x4x_TP_ENABLE 0x12
+
+#define P3H2x4x_DEV_CONF 0x13
+#define P3H2x4x_IO_STRENGTH 0x14
+#define P3H2x4x_TP0145_IO_STRENGTH_MASK GENMASK(1, 0)
+#define P3H2x4x_TP0145_IO_STRENGTH(x) \
+ FIELD_PREP(P3H2x4x_TP0145_IO_STRENGTH_MASK, x)
+#define P3H2x4x_TP2367_IO_STRENGTH_MASK GENMASK(3, 2)
+#define P3H2x4x_TP2367_IO_STRENGTH(x) \
+ FIELD_PREP(P3H2x4x_TP2367_IO_STRENGTH_MASK, x)
+#define P3H2x4x_CP0_IO_STRENGTH_MASK GENMASK(5, 4)
+#define P3H2x4x_CP0_IO_STRENGTH(x) \
+ FIELD_PREP(P3H2x4x_CP0_IO_STRENGTH_MASK, x)
+#define P3H2x4x_CP1_IO_STRENGTH_MASK GENMASK(7, 6)
+#define P3H2x4x_CP1_IO_STRENGTH(x) \
+ FIELD_PREP(P3H2x4x_CP1_IO_STRENGTH_MASK, x)
+#define P3H2x4x_IO_STRENGTH_MASK GENMASK(7, 0)
+
+#define P3H2x4x_TP_IO_MODE_CONF 0x17
+#define P3H2x4x_TP_SMBUS_AGNT_EN 0x18
+
+#define P3H2x4x_LDO_AND_PULLUP_CONF 0x19
+
+#define P3H2x4x_TP0145_PULLUP_CONF_MASK GENMASK(7, 6)
+#define P3H2x4x_TP0145_PULLUP_CONF(x) \
+ FIELD_PREP(P3H2x4x_TP0145_PULLUP_CONF_MASK, x)
+#define P3H2x4x_TP2367_PULLUP_CONF_MASK GENMASK(5, 4)
+#define P3H2x4x_TP2367_PULLUP_CONF(x) \
+ FIELD_PREP(P3H2x4x_TP2367_PULLUP_CONF_MASK, x)
+#define P3H2x4x_PULLUP_CONF_MASK GENMASK(7, 4)
+
+#define P3H2x4x_CP_IBI_CONF 0x1a
+
+#define P3H2x4x_TP_SMBUS_AGNT_IBI_CONFIG 0x1b
+
+#define P3H2x4x_IBI_MDB_CUSTOM 0x1c
+#define P3H2x4x_JEDEC_CONTEXT_ID 0x1d
+#define P3H2x4x_TP_GPIO_MODE_EN 0x1e
+
+/* Device Status and IBI Registers */
+#define P3H2x4x_DEV_AND_IBI_STS 0x20
+#define P3H2x4x_TP_SMBUS_AGNT_IBI_STS 0x21
+#define P3H2x4x_SMBUS_AGENT_EVENT_FLAG_STATUS BIT(4)
+
+/* Controller Port Control/Status Registers */
+#define P3H2x4x_CP_MUX_SET 0x38
+#define P3H2x4x_CONTROLLER_PORT_MUX_REQ BIT(0)
+#define P3H2x4x_CP_MUX_STS 0x39
+#define P3H2x4x_CONTROLLER_PORT_MUX_CONNECTION_STATUS BIT(0)
+
+/* Target Ports Control Registers */
+#define P3H2x4x_TP_SMBUS_AGNT_TRANS_START 0x50
+#define P3H2x4x_TP_NET_CON_CONF 0x51
+
+#define P3H2x4x_TP_PULLUP_EN 0x53
+
+#define P3H2x4x_TP_SCL_OUT_EN 0x54
+#define P3H2x4x_TP_SDA_OUT_EN 0x55
+#define P3H2x4x_TP_SCL_OUT_LEVEL 0x56
+#define P3H2x4x_TP_SDA_OUT_LEVEL 0x57
+#define P3H2x4x_TP_IN_DETECT_MODE_CONF 0x58
+#define P3H2x4x_TP_SCL_IN_DETECT_IBI_EN 0x59
+#define P3H2x4x_TP_SDA_IN_DETECT_IBI_EN 0x5a
+
+/* Target Ports Status Registers */
+#define P3H2x4x_TP_SCL_IN_LEVEL_STS 0x60
+#define P3H2x4x_TP_SDA_IN_LEVEL_STS 0x61
+#define P3H2x4x_TP_SCL_IN_DETECT_FLG 0x62
+#define P3H2x4x_TP_SDA_IN_DETECT_FLG 0x63
+
+/* SMBus Agent Configuration and Status Registers */
+#define P3H2x4x_TP0_SMBUS_AGNT_STS 0x64
+#define P3H2x4x_TP1_SMBUS_AGNT_STS 0x65
+#define P3H2x4x_TP2_SMBUS_AGNT_STS 0x66
+#define P3H2x4x_TP3_SMBUS_AGNT_STS 0x67
+#define P3H2x4x_TP4_SMBUS_AGNT_STS 0x68
+#define P3H2x4x_TP5_SMBUS_AGNT_STS 0x69
+#define P3H2x4x_TP6_SMBUS_AGNT_STS 0x6a
+#define P3H2x4x_TP7_SMBUS_AGNT_STS 0x6b
+#define P3H2x4x_ONCHIP_TD_AND_SMBUS_AGNT_CONF 0x6c
+
+/* buf receive flag set */
+#define P3H2x4x_TARGET_BUF_CA_TF BIT(0)
+#define P3H2x4x_TARGET_BUF_0_RECEIVE BIT(1)
+#define P3H2x4x_TARGET_BUF_1_RECEIVE BIT(2)
+#define P3H2x4x_TARGET_BUF_0_1_RECEIVE GENMASK(2, 1)
+#define P3H2x4x_TARGET_BUF_OVRFL GENMASK(3, 1)
+#define BUF_RECEIVED_FLAG_MASK GENMASK(3, 1)
+#define BUF_RECEIVED_FLAG_TF_MASK GENMASK(3, 0)
+
+#define P3H2x4x_TARGET_AGENT_LOCAL_DEV 0x11
+#define P3H2x4x_TARGET_BUFF_0_PAGE 0x12
+#define P3H2x4x_TARGET_BUFF_1_PAGE 0x13
+
+/* Special Function Registers */
+#define P3H2x4x_LDO_AND_CPSEL_STS 0x79
+#define P3H2x4x_CP_SDA1_LEVEL BIT(7)
+#define P3H2x4x_CP_SCL1_LEVEL BIT(6)
+
+#define P3H2x4x_CP_SEL_PIN_INPUT_CODE_MASK GENMASK(5, 4)
+#define P3H2x4x_CP_SEL_PIN_INPUT_CODE_GET(x) \
+ (((x) & P3H2x4x_CP_SEL_PIN_INPUT_CODE_MASK) >> 4)
+#define P3H2x4x_CP_SDA1_SCL1_PINS_CODE_MASK GENMASK(7, 6)
+#define P3H2x4x_CP_SDA1_SCL1_PINS_CODE_GET(x) \
+ (((x) & P3H2x4x_CP_SDA1_SCL1_PINS_CODE_MASK) >> 6)
+#define P3H2x4x_VCCIO1_PWR_GOOD BIT(3)
+#define P3H2x4x_VCCIO0_PWR_GOOD BIT(2)
+#define P3H2x4x_CP1_VCCIO_PWR_GOOD BIT(1)
+#define P3H2x4x_CP0_VCCIO_PWR_GOOD BIT(0)
+
+#define P3H2x4x_BUS_RESET_SCL_TIMEOUT 0x7a
+#define P3H2x4x_ONCHIP_TD_PROTO_ERR_FLG 0x7b
+#define P3H2x4x_DEV_CMD 0x7c
+#define P3H2x4x_ONCHIP_TD_STS 0x7d
+#define P3H2x4x_ONCHIP_TD_ADDR_CONF 0x7e
+#define P3H2x4x_PAGE_PTR 0x7f
+
+/* Paged Transaction Registers */
+#define P3H2x4x_CONTROLLER_BUFFER_PAGE 0x10
+#define P3H2x4x_CONTROLLER_AGENT_BUFF 0x80
+#define P3H2x4x_CONTROLLER_AGENT_BUFF_DATA 0x84
+
+#define P3H2x4x_TARGET_BUFF_LENGTH 0x80
+#define P3H2x4x_TARGET_BUFF_ADDRESS 0x81
+#define P3H2x4x_TARGET_BUFF_DATA 0x82
+
+#define P3H2x4x_TP_MAX_COUNT 0x08
+#define P3H2x4x_CP_MAX_COUNT 0x02
+#define P3H2x4x_TP_LOCAL_DEV 0x08
+
+/* LDO Disable/Enable DT settings */
+#define P3H2x4x_LDO_VOLT_1_0V 0x00
+#define P3H2x4x_LDO_VOLT_1_1V 0x01
+#define P3H2x4x_LDO_VOLT_1_2V 0x02
+#define P3H2x4x_LDO_VOLT_1_8V 0x03
+
+#define P3H2x4x_LDO_DISABLED 0x00
+#define P3H2x4x_LDO_ENABLED 0x01
+
+#define P3H2x4x_IBI_DISABLED 0x00
+#define P3H2x4x_IBI_ENABLED 0x01
+
+/* Pullup selection DT settings */
+#define P3H2x4x_TP_PULLUP_250R 0x00
+#define P3H2x4x_TP_PULLUP_500R 0x01
+#define P3H2x4x_TP_PULLUP_1000R 0x02
+#define P3H2x4x_TP_PULLUP_2000R 0x03
+
+#define P3H2x4x_TP_PULLUP_DISABLED 0x00
+#define P3H2x4x_TP_PULLUP_ENABLED 0x01
+
+#define P3H2x4x_IO_STRENGTH_20_OHM 0x00
+#define P3H2x4x_IO_STRENGTH_30_OHM 0x01
+#define P3H2x4x_IO_STRENGTH_40_OHM 0x02
+#define P3H2x4x_IO_STRENGTH_50_OHM 0x03
+
+#define P3H2x4x_TP_MODE_I3C 0x00
+#define P3H2x4x_TP_MODE_SMBUS 0x01
+#define P3H2x4x_TP_MODE_GPIO 0x02
+#define P3H2x4x_TP_MODE_I2C 0x03
+
+#define ONE_BYTE_SIZE 0x01
+
+/* holding SDA low when both SMBus Target Agent received data buffers are full.
+ * This feature can be used as a flow-control mechanism for MCTP applications to
+ * avoid MCTP transmitters on Target Ports time out when the SMBus agent buffers
+ * are not serviced in time by upstream controller and only receives write message
+ * from its downstream ports.
+ * SMBUS_AGENT_TX_RX_LOOPBACK_EN/TARGET_AGENT_BUF_FULL_SDA_LOW_EN
+ */
+
+#define P3H2x4x_TARGET_AGENT_DFT_IBI_CONF 0x20
+#define P3H2x4x_TARGET_AGENT_DFT_IBI_CONF_MASK 0x21
+
+/* Transaction status checking mask */
+
+#define P3H2x4x_SMBUS_TRANSACTION_FINISH_FLAG 1
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_SHIFT 4
+
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_OK 0
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_ADDR_NAK 1
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_DATA_NAK 2
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_WTR_NAK 3
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_SYNC_RCV 4
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_SYNC_RCVCLR 5
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_FAULT 6
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_ARB_LOSS 7
+#define P3H2x4x_SMBUS_CNTRL_STATUS_TXN_SCL_TO 8
+
+#define P3H2x4x_TP_BUFFER_STATUS_MASK 0x0f
+#define P3H2x4x_TP_TRANSACTION_CODE_MASK 0xf0
+
+/* SMBus transaction types fields */
+#define P3H2x4x_SMBUS_400kHz BIT(2)
+
+/* SMBus polling */
+#define P3H2x4x_POLLING_ROLL_PERIOD_MS 10
+
+/* Hub buffer size */
+#define P3H2x4x_CONTROLLER_BUFFER_SIZE 88
+#define P3H2x4x_TARGET_BUFFER_SIZE 80
+#define P3H2x4x_SMBUS_DESCRIPTOR_SIZE 4
+#define P3H2x4x_SMBUS_PAYLOAD_SIZE \
+ (P3H2x4x_CONTROLLER_BUFFER_SIZE - P3H2x4x_SMBUS_DESCRIPTOR_SIZE)
+#define P3H2x4x_SMBUS_TARGET_PAYLOAD_SIZE (P3H2x4x_TARGET_BUFFER_SIZE - 2)
+
+/* Hub SMBus transaction time */
+#define P3H2x4x_SMBUS_400kHz_TRANSFER_TIMEOUT(x) ((20 * (x)) + 80)
+
+#define P3H2x4x_NO_PAGE_PER_TP 4
+
+#define P3H2x4x_MAX_PAYLOAD_LEN 2
+#define P3H2x4x_NUM_SLOTS 6
+
+#define P3H2x4x_HUB_ID 0
+
+#define P3H2x4x_SET_BIT(n) BIT(n)
+
+enum p3h2x4x_tp {
+ TP_0,
+ TP_1,
+ TP_2,
+ TP_3,
+ TP_4,
+ TP_5,
+ TP_6,
+ TP_7,
+};
+
+enum p3h2x4x_rcv_buf {
+ RCV_BUF_0,
+ RCV_BUF_1,
+ RCV_BUF_OF,
+};
+
+struct p3h2x4x_regulators {
+ struct regulator *rcp0;
+ struct regulator *rcp1;
+ struct regulator *rtp0145;
+ struct regulator *rtp2367;
+};
+
+struct tp_configuration {
+ bool pullup_en;
+ bool ibi_en;
+ bool always_enable;
+ int mode;
+};
+
+struct hub_configuration {
+ int tp0145_pullup;
+ int tp2367_pullup;
+ int cp0_io_strength;
+ int cp1_io_strength;
+ int tp0145_io_strength;
+ int tp2367_io_strength;
+ struct tp_configuration tp_config[P3H2x4x_TP_MAX_COUNT];
+};
+
+struct tp_bus {
+ bool is_registered; /* bus was registered in the framework. */
+ u8 tp_mask;
+ u8 tp_port;
+ struct mutex port_mutex; /* per port mutex */
+ struct device_node *of_node;
+ struct i2c_client *tp_smbus_client;
+ struct i2c_adapter *tp_smbus_adapter;
+ struct i3c_hub_controller hub_controller;
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub;
+};
+
+struct p3h2x4x_i3c_hub_dev {
+ struct device *dev;
+ struct regmap *regmap;
+ struct mutex etx_mutex; /* all port mutex */
+ struct i3c_device *i3cdev;
+ struct i2c_client *i2c_client;
+ struct p3h2x4x_regulators rp3h2x4x;
+ struct hub_configuration hub_config;
+ struct tp_bus tp_bus[P3H2x4x_TP_MAX_COUNT];
+ struct i3c_hub *hub;
+};
+
+/**
+ * p3h2x4x_tp_smbus_algo - add i2c adapter for target port configured as SMBus.
+ * @priv: p3h2x4x device structure.
+ * @tp: target port.
+ * Return: 0 in case of success, a negative EINVAL code if the error.
+ */
+int p3h2x4x_tp_smbus_algo(struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub);
+
+/**
+ * p3h2x4x_tp_i3c_algo - register i3c controller for target port configured as I3C.
+ * @priv: p3h2x4x device structure.
+ * @tp: target port.
+ * Return: 0 in case of success, a negative EINVAL code if the error.
+ */
+int p3h2x4x_tp_i3c_algo(struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub);
+
+/**
+ * p3h2x4x_ibi_handler - IBI handler.
+ * @i3cdev: i3c device.
+ * @payload: two byte IBI payload data.
+ */
+void p3h2x4x_ibi_handler(struct i3c_device *i3cdev,
+ const struct i3c_ibi_payload *payload);
+#endif /* P3H2840_I3C_HUB_H */
diff --git a/drivers/i3c/hub/p3h2840_i3c_hub_common.c b/drivers/i3c/hub/p3h2840_i3c_hub_common.c
new file mode 100644
index 000000000000..a06faaddd9e3
--- /dev/null
+++ b/drivers/i3c/hub/p3h2840_i3c_hub_common.c
@@ -0,0 +1,398 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2025-2026 NXP
+ * This P3H2x4x driver file implements functions for Hub probe and DT parsing.
+ */
+
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/p3h2840.h>
+
+#include "p3h2840_i3c_hub.h"
+
+/* LDO voltage DT settings */
+#define P3H2x4x_DT_LDO_VOLT_1_0V 1000000
+#define P3H2x4x_DT_LDO_VOLT_1_1V 1100000
+#define P3H2x4x_DT_LDO_VOLT_1_2V 1200000
+#define P3H2x4x_DT_LDO_VOLT_1_8V 1800000
+
+static const int p3h2x4x_pullup_tbl[] = {
+ 250, 500, 1000, 2000
+};
+
+static const int p3h2x4x_io_strength_tbl[] = {
+ 20, 30, 40, 50
+};
+
+static int find_close(int val, const int *tbl, int size)
+{
+ int best = 0, i;
+
+ for (i = 1; i < size; i++)
+ if (abs(tbl[i] - val) < abs(tbl[best] - val))
+ best = i;
+
+ return best;
+}
+
+static u8 p3h2x4x_pullup_dt_to_reg(int dt_value)
+{
+ return find_close(dt_value, p3h2x4x_pullup_tbl,
+ ARRAY_SIZE(p3h2x4x_pullup_tbl));
+}
+
+static u8 p3h2x4x_io_strength_dt_to_reg(int dt_value)
+{
+ return find_close(dt_value, p3h2x4x_io_strength_tbl,
+ ARRAY_SIZE(p3h2x4x_io_strength_tbl));
+}
+
+static int p3h2x4x_configure_pullup(struct device *dev)
+{
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = dev_get_drvdata(dev);
+ u8 pullup;
+
+ pullup = P3H2x4x_TP0145_PULLUP_CONF(p3h2x4x_pullup_dt_to_reg
+ (p3h2x4x_i3c_hub->hub_config.tp0145_pullup));
+
+ pullup |= P3H2x4x_TP2367_PULLUP_CONF(p3h2x4x_pullup_dt_to_reg
+ (p3h2x4x_i3c_hub->hub_config.tp2367_pullup));
+
+ return regmap_update_bits(p3h2x4x_i3c_hub->regmap, P3H2x4x_LDO_AND_PULLUP_CONF,
+ P3H2x4x_PULLUP_CONF_MASK, pullup);
+}
+
+static int p3h2x4x_configure_io_strength(struct device *dev)
+{
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = dev_get_drvdata(dev);
+ u8 io_strength;
+
+ io_strength = P3H2x4x_CP0_IO_STRENGTH(p3h2x4x_io_strength_dt_to_reg
+ (p3h2x4x_i3c_hub->hub_config.cp0_io_strength));
+
+ io_strength |= P3H2x4x_CP1_IO_STRENGTH(p3h2x4x_io_strength_dt_to_reg
+ (p3h2x4x_i3c_hub->hub_config.cp1_io_strength));
+
+ io_strength |= P3H2x4x_TP0145_IO_STRENGTH(p3h2x4x_io_strength_dt_to_reg
+ (p3h2x4x_i3c_hub->hub_config.tp0145_io_strength));
+
+ io_strength |= P3H2x4x_TP2367_IO_STRENGTH(p3h2x4x_io_strength_dt_to_reg
+ (p3h2x4x_i3c_hub->hub_config.tp2367_io_strength));
+
+ return regmap_update_bits(p3h2x4x_i3c_hub->regmap, P3H2x4x_IO_STRENGTH,
+ P3H2x4x_IO_STRENGTH_MASK, io_strength);
+}
+
+static int p3h2x4x_configure_ldo(struct device *dev)
+{
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = dev_get_drvdata(dev);
+ int ret;
+
+ p3h2x4x_i3c_hub->rp3h2x4x.rcp0 = devm_regulator_get_optional(dev, "vcc1");
+ if (IS_ERR(p3h2x4x_i3c_hub->rp3h2x4x.rcp0)) {
+ p3h2x4x_i3c_hub->rp3h2x4x.rcp0 = NULL;
+ dev_dbg(dev, "vdd1-supply not found\n");
+ }
+
+ p3h2x4x_i3c_hub->rp3h2x4x.rcp1 = devm_regulator_get_optional(dev, "vcc2");
+ if (IS_ERR(p3h2x4x_i3c_hub->rp3h2x4x.rcp1)) {
+ p3h2x4x_i3c_hub->rp3h2x4x.rcp1 = NULL;
+ dev_dbg(dev, "vdd2-supply not found\n");
+ }
+
+ p3h2x4x_i3c_hub->rp3h2x4x.rtp0145 = devm_regulator_get_optional(dev, "vcc3");
+ if (IS_ERR(p3h2x4x_i3c_hub->rp3h2x4x.rtp0145)) {
+ p3h2x4x_i3c_hub->rp3h2x4x.rtp0145 = NULL;
+ dev_dbg(dev, "vdd3-supply not found\n");
+ }
+
+ p3h2x4x_i3c_hub->rp3h2x4x.rtp2367 = devm_regulator_get_optional(dev, "vcc4");
+ if (IS_ERR(p3h2x4x_i3c_hub->rp3h2x4x.rtp2367)) {
+ p3h2x4x_i3c_hub->rp3h2x4x.rtp2367 = NULL;
+ dev_dbg(dev, "vdd4-supply not found\n");
+ }
+
+ /* Enable regulators */
+ if (p3h2x4x_i3c_hub->rp3h2x4x.rcp0) {
+ ret = regulator_enable(p3h2x4x_i3c_hub->rp3h2x4x.rcp0);
+ if (ret)
+ dev_warn(dev, "Failed to enable regulator CP0 (%d)\n", ret);
+ }
+
+ if (p3h2x4x_i3c_hub->rp3h2x4x.rcp1) {
+ ret = regulator_enable(p3h2x4x_i3c_hub->rp3h2x4x.rcp1);
+ if (ret)
+ dev_warn(dev, "Failed to enable regulator CP1 (%d)\n", ret);
+ }
+
+ if (p3h2x4x_i3c_hub->rp3h2x4x.rtp0145) {
+ ret = regulator_enable(p3h2x4x_i3c_hub->rp3h2x4x.rtp0145);
+ if (ret)
+ dev_warn(dev, "Failed to enable regulator TPG0 (%d)\n", ret);
+ }
+
+ if (p3h2x4x_i3c_hub->rp3h2x4x.rtp2367) {
+ ret = regulator_enable(p3h2x4x_i3c_hub->rp3h2x4x.rtp2367);
+ if (ret)
+ dev_warn(dev, "Failed to enable regulator TPG1 (%d)\n", ret);
+ }
+
+ /* This delay is required for the regulator to stabilize its output voltage */
+ mdelay(5);
+
+ return 0;
+}
+
+static int p3h2x4x_configure_tp(struct device *dev)
+{
+ struct p3h2x4x_i3c_hub_dev *hub = dev_get_drvdata(dev);
+ u8 mode = 0, smbus = 0, pullup = 0, target_port = 0;
+ int tp, ret;
+
+ for (tp = 0; tp < P3H2x4x_TP_MAX_COUNT; tp++) {
+ pullup |= hub->hub_config.tp_config[tp].pullup_en ? P3H2x4x_SET_BIT(tp) : 0;
+ mode |= (hub->hub_config.tp_config[tp].mode != P3H2x4x_TP_MODE_I3C) ?
+ P3H2x4x_SET_BIT(tp) : 0;
+ smbus |= (hub->hub_config.tp_config[tp].mode == P3H2x4x_TP_MODE_SMBUS) ?
+ P3H2x4x_SET_BIT(tp) : 0;
+ target_port |= (hub->tp_bus[tp].tp_mask == P3H2x4x_SET_BIT(tp)) ?
+ hub->tp_bus[tp].tp_mask : 0;
+ }
+
+ ret = regmap_update_bits(hub->regmap, P3H2x4x_TP_PULLUP_EN, pullup, pullup);
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(hub->regmap, P3H2x4x_TP_IO_MODE_CONF, mode, mode);
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(hub->regmap, P3H2x4x_TP_SMBUS_AGNT_EN, smbus, smbus);
+ if (ret)
+ return ret;
+
+ if (target_port & ~smbus) {
+ ret = regmap_write(hub->regmap, P3H2x4x_CP_MUX_SET,
+ P3H2x4x_CONTROLLER_PORT_MUX_REQ);
+ if (ret)
+ return ret;
+ }
+
+ return regmap_update_bits(hub->regmap, P3H2x4x_TP_ENABLE, target_port, target_port);
+}
+
+static int p3h2x4x_configure_hw(struct device *dev)
+{
+ int ret;
+
+ ret = p3h2x4x_configure_ldo(dev);
+ if (ret)
+ return ret;
+
+ ret = p3h2x4x_configure_pullup(dev);
+ if (ret)
+ return ret;
+
+ ret = p3h2x4x_configure_io_strength(dev);
+ if (ret)
+ return ret;
+
+ return p3h2x4x_configure_tp(dev);
+}
+
+static void p3h2x4x_get_target_port_dt_conf(struct device *dev,
+ const struct device_node *node)
+{
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = dev_get_drvdata(dev);
+ u64 tp_port;
+
+ for_each_available_child_of_node_scoped(node, dev_node) {
+ if (of_property_read_reg(dev_node, 0, &tp_port, NULL))
+ continue;
+
+ if (tp_port < P3H2x4x_TP_MAX_COUNT) {
+ p3h2x4x_i3c_hub->tp_bus[tp_port].of_node = dev_node;
+ p3h2x4x_i3c_hub->tp_bus[tp_port].tp_mask = P3H2x4x_SET_BIT(tp_port);
+ p3h2x4x_i3c_hub->tp_bus[tp_port].p3h2x4x_i3c_hub = p3h2x4x_i3c_hub;
+ p3h2x4x_i3c_hub->tp_bus[tp_port].tp_port = tp_port;
+ }
+ }
+}
+
+static void p3h2x4x_parse_tp_dt_settings(struct device *dev,
+ const struct device_node *node,
+ struct tp_configuration tp_config[])
+{
+ u64 id;
+
+ for_each_available_child_of_node_scoped(node, tp_node) {
+ if (of_property_read_reg(tp_node, 0, &id, NULL))
+ continue;
+
+ if (id >= P3H2x4x_TP_MAX_COUNT) {
+ dev_warn(dev, "Invalid target port index found in DT: %lli\n", id);
+ continue;
+ }
+
+ if (strcmp(tp_node->name, "i3c") == 0)
+ tp_config[id].mode = P3H2x4x_TP_MODE_I3C;
+
+ if (strcmp(tp_node->name, "i2c") == 0)
+ tp_config[id].mode = P3H2x4x_TP_MODE_I2C;
+
+ if (strcmp(tp_node->name, "smbus") == 0)
+ tp_config[id].mode = P3H2x4x_TP_MODE_SMBUS;
+
+ tp_config[id].pullup_en =
+ of_property_read_bool(tp_node, "nxp,pullup-enable");
+ }
+}
+
+static void p3h2x4x_get_hub_dt_conf(struct device *dev,
+ const struct device_node *node)
+{
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = dev_get_drvdata(dev);
+
+ of_property_read_u32(node, "nxp,tp0145-pullup-ohms",
+ &p3h2x4x_i3c_hub->hub_config.tp0145_pullup);
+ of_property_read_u32(node, "nxp,tp2367-pullup-ohms",
+ &p3h2x4x_i3c_hub->hub_config.tp2367_pullup);
+ of_property_read_u32(node, "nxp,cp0-io-strength-ohms",
+ &p3h2x4x_i3c_hub->hub_config.cp0_io_strength);
+ of_property_read_u32(node, "nxp,cp1-io-strength-ohms",
+ &p3h2x4x_i3c_hub->hub_config.cp1_io_strength);
+ of_property_read_u32(node, "nxp,tp0145-io-strength-ohms",
+ &p3h2x4x_i3c_hub->hub_config.tp0145_io_strength);
+ of_property_read_u32(node, "nxp,tp2367-io-strength-ohms",
+ &p3h2x4x_i3c_hub->hub_config.tp2367_io_strength);
+
+ p3h2x4x_parse_tp_dt_settings(dev, node, p3h2x4x_i3c_hub->hub_config.tp_config);
+}
+
+static void p3h2x4x_default_configuration(struct device *dev)
+{
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = dev_get_drvdata(dev);
+ int tp_count;
+
+ p3h2x4x_i3c_hub->hub_config.tp0145_pullup = P3H2x4x_TP_PULLUP_500R;
+ p3h2x4x_i3c_hub->hub_config.tp2367_pullup = P3H2x4x_TP_PULLUP_500R;
+ p3h2x4x_i3c_hub->hub_config.cp0_io_strength = P3H2x4x_IO_STRENGTH_20_OHM;
+ p3h2x4x_i3c_hub->hub_config.cp1_io_strength = P3H2x4x_IO_STRENGTH_20_OHM;
+ p3h2x4x_i3c_hub->hub_config.tp0145_io_strength = P3H2x4x_IO_STRENGTH_20_OHM;
+ p3h2x4x_i3c_hub->hub_config.tp2367_io_strength = P3H2x4x_IO_STRENGTH_20_OHM;
+
+ for (tp_count = 0; tp_count < P3H2x4x_TP_MAX_COUNT; ++tp_count)
+ p3h2x4x_i3c_hub->hub_config.tp_config[tp_count].mode = P3H2x4x_TP_MODE_I3C;
+}
+
+static int p3h2x4x_i3c_hub_probe(struct platform_device *pdev)
+{
+ struct p3h2x4x_dev *p3h2x4x = dev_get_drvdata(pdev->dev.parent);
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub;
+ struct device *dev = &pdev->dev;
+ struct device_node *node;
+ int ret, i;
+
+ p3h2x4x_i3c_hub = devm_kzalloc(dev, sizeof(*p3h2x4x_i3c_hub), GFP_KERNEL);
+ if (!p3h2x4x_i3c_hub)
+ return -ENOMEM;
+
+ p3h2x4x_i3c_hub->regmap = p3h2x4x->regmap;
+ p3h2x4x_i3c_hub->dev = dev;
+
+ platform_set_drvdata(pdev, p3h2x4x_i3c_hub);
+ device_set_of_node_from_dev(dev, dev->parent);
+
+ p3h2x4x_default_configuration(dev);
+
+ ret = devm_mutex_init(dev, &p3h2x4x_i3c_hub->etx_mutex);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < P3H2x4x_TP_MAX_COUNT; i++) {
+ ret = devm_mutex_init(dev, &p3h2x4x_i3c_hub->tp_bus[i].port_mutex);
+ if (ret)
+ return ret;
+ }
+
+ /* get hub node from DT */
+ node = dev->of_node;
+ if (!node)
+ return dev_err_probe(dev, -ENODEV, "No Device Tree entry found\n");
+
+ p3h2x4x_get_hub_dt_conf(dev, node);
+ p3h2x4x_get_target_port_dt_conf(dev, node);
+
+ /* Unlock access to protected registers */
+ ret = regmap_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_DEV_REG_PROTECTION_CODE,
+ P3H2x4x_REGISTERS_UNLOCK_CODE);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to unlock HUB's protected registers\n");
+
+ ret = p3h2x4x_configure_hw(dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to configure the HUB\n");
+
+ /* Register logic for native vertual I3C ports */
+ if (p3h2x4x->is_p3h2x4x_in_i3c) {
+ p3h2x4x_i3c_hub->i3cdev = p3h2x4x->i3cdev;
+ ret = p3h2x4x_tp_i3c_algo(p3h2x4x_i3c_hub);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to register i3c bus\n");
+ } else {
+ p3h2x4x_i3c_hub->i2c_client = p3h2x4x->i2c_client;
+ }
+
+ /* Register logic for native SMBus ports */
+ ret = p3h2x4x_tp_smbus_algo(p3h2x4x_i3c_hub);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to add i2c adapter\n");
+
+ /* Lock access to protected registers */
+ ret = regmap_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_DEV_REG_PROTECTION_CODE,
+ P3H2x4x_REGISTERS_LOCK_CODE);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to lock HUB's protected registers\n");
+
+ return 0;
+}
+
+static void p3h2x4x_i3c_hub_remove(struct platform_device *pdev)
+{
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = platform_get_drvdata(pdev);
+ struct p3h2x4x_dev *p3h2x4x = dev_get_drvdata(pdev->dev.parent);
+ u8 i;
+
+ for (i = 0; i < P3H2x4x_TP_MAX_COUNT; i++) {
+ if (!p3h2x4x_i3c_hub->tp_bus[i].is_registered)
+ continue;
+
+ if (p3h2x4x_i3c_hub->hub_config.tp_config[i].mode == P3H2x4x_TP_MODE_SMBUS)
+ i2c_del_adapter(p3h2x4x_i3c_hub->tp_bus[i].tp_smbus_adapter);
+ else if (p3h2x4x_i3c_hub->hub_config.tp_config[i].mode == P3H2x4x_TP_MODE_I3C)
+ i3c_master_unregister(&p3h2x4x_i3c_hub->tp_bus[i]
+ .hub_controller.controller);
+ }
+
+ if (p3h2x4x->is_p3h2x4x_in_i3c) {
+ i3c_device_disable_ibi(p3h2x4x->i3cdev);
+ i3c_device_free_ibi(p3h2x4x->i3cdev);
+ }
+}
+
+static struct platform_driver p3h2x4x_i3c_hub_driver = {
+ .driver = {
+ .name = "p3h2x4x-i3c-hub",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ },
+ .probe = p3h2x4x_i3c_hub_probe,
+ .remove = p3h2x4x_i3c_hub_remove,
+};
+module_platform_driver(p3h2x4x_i3c_hub_driver);
+
+MODULE_AUTHOR("Aman Kumar Pandey <aman.kumarpandey@nxp.com>");
+MODULE_AUTHOR("Vikash Bansal <vikash.bansal@nxp.com>");
+MODULE_AUTHOR("Lakshay Piplani <lakshay.piplani@nxp.com>");
+MODULE_DESCRIPTION("P3H2x4x I3C HUB driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/i3c/hub/p3h2840_i3c_hub_i3c.c b/drivers/i3c/hub/p3h2840_i3c_hub_i3c.c
new file mode 100644
index 000000000000..833bc0bebc4e
--- /dev/null
+++ b/drivers/i3c/hub/p3h2840_i3c_hub_i3c.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2025-2026 NXP
+ * This P3H2x4x driver file contain functions for I3C virtual Bus creation, connect/disconnect
+ * hub network and read/write.
+ */
+#include <linux/i3c/hub.h>
+#include <linux/mfd/p3h2840.h>
+#include <linux/regmap.h>
+
+#include "p3h2840_i3c_hub.h"
+
+static const struct i3c_ibi_setup p3h2x4x_ibireq = {
+ .handler = p3h2x4x_ibi_handler,
+ .max_payload_len = P3H2x4x_MAX_PAYLOAD_LEN,
+ .num_slots = P3H2x4x_NUM_SLOTS,
+};
+
+static inline struct tp_bus *
+p3h2x4x_bus_from_controller(struct i3c_master_controller *controller)
+{
+ struct i3c_hub_controller *hub_controller;
+
+ hub_controller = container_of(controller, struct i3c_hub_controller, controller);
+
+ return container_of(hub_controller, struct tp_bus, hub_controller);
+}
+
+static void p3h2x4x_hub_enable_port(struct i3c_master_controller *controller)
+{
+ struct tp_bus *bus = p3h2x4x_bus_from_controller(controller);
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = bus->p3h2x4x_i3c_hub;
+
+ if (p3h2x4x_i3c_hub->hub_config.tp_config[bus->tp_port].always_enable)
+ return;
+
+ regmap_set_bits(p3h2x4x_i3c_hub->regmap, P3H2x4x_TP_NET_CON_CONF, bus->tp_mask);
+}
+
+static void p3h2x4x_hub_disable_port(struct i3c_master_controller *controller)
+{
+ struct tp_bus *bus = p3h2x4x_bus_from_controller(controller);
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = bus->p3h2x4x_i3c_hub;
+
+ if (p3h2x4x_i3c_hub->hub_config.tp_config[bus->tp_port].always_enable)
+ return;
+
+ regmap_clear_bits(p3h2x4x_i3c_hub->regmap, P3H2x4x_TP_NET_CON_CONF, bus->tp_mask);
+}
+
+static const struct i3c_hub_ops p3h2x4x_hub_ops = {
+ .enable_port = p3h2x4x_hub_enable_port,
+ .disable_port = p3h2x4x_hub_disable_port,
+};
+
+/**
+ * p3h2x4x_tp_i3c_algo - register i3c master for target port who
+ * configured as i3c.
+ * @hub: p3h2x4x device structure.
+ * Return: 0 in case of success, negative error code on failur.
+ */
+int p3h2x4x_tp_i3c_algo(struct p3h2x4x_i3c_hub_dev *p3h2x4x_hub)
+{
+ struct i3c_master_controller *parent = i3c_dev_get_master(p3h2x4x_hub->i3cdev->desc);
+ u8 tp, ntwk_mask = 0;
+ int ret;
+
+ p3h2x4x_hub->hub = i3c_hub_init(parent,
+ &p3h2x4x_hub_ops,
+ p3h2x4x_hub->i3cdev);
+
+ if (IS_ERR(p3h2x4x_hub->hub))
+ return PTR_ERR(p3h2x4x_hub->hub);
+
+ for (tp = 0; tp < P3H2x4x_TP_MAX_COUNT; tp++) {
+ if (!p3h2x4x_hub->tp_bus[tp].of_node ||
+ p3h2x4x_hub->hub_config.tp_config[tp].mode != P3H2x4x_TP_MODE_I3C)
+ continue;
+
+ /* Assign DT node for this TP */
+ p3h2x4x_hub->dev->of_node = p3h2x4x_hub->tp_bus[tp].of_node;
+
+ struct i3c_hub_controller *hub_controller =
+ &p3h2x4x_hub->tp_bus[tp].hub_controller;
+ struct i3c_master_controller *controller = &hub_controller->controller;
+
+ hub_controller->parent = parent;
+ hub_controller->hub = p3h2x4x_hub->hub;
+
+ dev_set_drvdata(&controller->dev, hub_controller);
+
+ ret = i3c_master_register(controller,
+ p3h2x4x_hub->dev,
+ i3c_hub_master_ops(),
+ false);
+
+ if (ret)
+ return ret;
+
+ /* Perform DAA */
+ ret = i3c_master_do_daa(parent);
+ if (ret)
+ return ret;
+
+ ntwk_mask |= p3h2x4x_hub->tp_bus[tp].tp_mask;
+ p3h2x4x_hub->tp_bus[tp].is_registered = true;
+ p3h2x4x_hub->hub_config.tp_config[tp].always_enable = true;
+ }
+
+ ret = i3c_device_request_ibi(p3h2x4x_hub->i3cdev, &p3h2x4x_ibireq);
+ if (ret)
+ return ret;
+
+ ret = i3c_device_enable_ibi(p3h2x4x_hub->i3cdev);
+ if (ret)
+ return ret;
+
+ return regmap_write(p3h2x4x_hub->regmap, P3H2x4x_TP_NET_CON_CONF, ntwk_mask);
+}
diff --git a/drivers/i3c/hub/p3h2840_i3c_hub_smbus.c b/drivers/i3c/hub/p3h2840_i3c_hub_smbus.c
new file mode 100644
index 000000000000..75803a59fd6c
--- /dev/null
+++ b/drivers/i3c/hub/p3h2840_i3c_hub_smbus.c
@@ -0,0 +1,423 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2025 NXP
+ * This P3H2x4x driver file contain functions for SMBus/I2C virtual Bus creation and read/write.
+ */
+#include <linux/mfd/p3h2840.h>
+#include <linux/regmap.h>
+
+#include "p3h2840_i3c_hub.h"
+
+#if IS_ENABLED(CONFIG_I2C_SLAVE)
+static void p3h2x4x_read_smbus_agent_rx_buf(struct i3c_device *i3cdev, enum p3h2x4x_rcv_buf rfbuf,
+ enum p3h2x4x_tp tp, bool is_of)
+{
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = dev_get_drvdata(&i3cdev->dev);
+ u8 slave_rx_buffer[P3H2x4x_SMBUS_TARGET_PAYLOAD_SIZE] = { 0 };
+ u8 target_buffer_page, flag_clear = 0x0f, temp, i;
+ u32 packet_len, slave_address, ret;
+
+ target_buffer_page = (((rfbuf) ? P3H2x4x_TARGET_BUFF_1_PAGE : P3H2x4x_TARGET_BUFF_0_PAGE)
+ + (P3H2x4x_NO_PAGE_PER_TP * tp));
+ ret = regmap_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_PAGE_PTR, target_buffer_page);
+ if (ret)
+ goto ibi_err;
+
+ /* read buffer length */
+ ret = regmap_read(p3h2x4x_i3c_hub->regmap, P3H2x4x_TARGET_BUFF_LENGTH, &packet_len);
+ if (ret)
+ goto ibi_err;
+
+ if (packet_len)
+ packet_len = packet_len - 1;
+
+ if (packet_len > P3H2x4x_SMBUS_TARGET_PAYLOAD_SIZE) {
+ dev_err(&i3cdev->dev, "Received message too big for p3h2x4x buffer\n");
+ return;
+ }
+
+ /* read slave address */
+ ret = regmap_read(p3h2x4x_i3c_hub->regmap, P3H2x4x_TARGET_BUFF_ADDRESS, &slave_address);
+ if (ret)
+ goto ibi_err;
+
+ /* read data */
+ if (packet_len) {
+ ret = regmap_bulk_read(p3h2x4x_i3c_hub->regmap, P3H2x4x_TARGET_BUFF_DATA,
+ slave_rx_buffer, packet_len);
+ if (ret)
+ goto ibi_err;
+ }
+
+ if (is_of)
+ flag_clear = BUF_RECEIVED_FLAG_TF_MASK;
+ else
+ flag_clear = (((rfbuf == RCV_BUF_0) ? P3H2x4x_TARGET_BUF_0_RECEIVE :
+ P3H2x4x_TARGET_BUF_1_RECEIVE));
+
+ /* notify slave driver about received data */
+ if ((p3h2x4x_i3c_hub->tp_bus[tp].tp_smbus_client->addr & 0x7f) == (slave_address >> 1)) {
+ i2c_slave_event(p3h2x4x_i3c_hub->tp_bus[tp].tp_smbus_client,
+ I2C_SLAVE_WRITE_REQUESTED, (u8 *)&slave_address);
+ for (i = 0; i < packet_len; i++) {
+ temp = slave_rx_buffer[i];
+ i2c_slave_event(p3h2x4x_i3c_hub->tp_bus[tp].tp_smbus_client,
+ I2C_SLAVE_WRITE_RECEIVED, &temp);
+ }
+ i2c_slave_event(p3h2x4x_i3c_hub->tp_bus[tp].tp_smbus_client, I2C_SLAVE_STOP, &temp);
+ }
+
+ibi_err:
+ regmap_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_PAGE_PTR, 0x00);
+ regmap_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_TP0_SMBUS_AGNT_STS + tp, flag_clear);
+}
+#endif
+
+/**
+ * p3h2x4x_ibi_handler - IBI handler.
+ * @i3cdev: i3c device.
+ * @payload: two byte IBI payload data.
+ *
+ */
+void p3h2x4x_ibi_handler(struct i3c_device *i3cdev,
+ const struct i3c_ibi_payload *payload)
+{
+ u32 payload_byte_one = (*(int *)payload->data);
+
+ if (!(payload_byte_one & P3H2x4x_SMBUS_AGENT_EVENT_FLAG_STATUS))
+ return;
+
+#if IS_ENABLED(CONFIG_I2C_SLAVE)
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = dev_get_drvdata(&i3cdev->dev);
+ u32 target_port_status, payload_byte_two;
+ u32 ret, i;
+
+ if (!p3h2x4x_i3c_hub || !p3h2x4x_i3c_hub->regmap)
+ return;
+
+ payload_byte_two = (*(int *)(payload->data + 4));
+ guard(mutex)(&p3h2x4x_i3c_hub->etx_mutex);
+
+ for (i = 0; i < P3H2x4x_TP_MAX_COUNT; ++i) {
+ if (p3h2x4x_i3c_hub->tp_bus[i].is_registered && (payload_byte_two >> i) & 0x01) {
+ ret = regmap_read(p3h2x4x_i3c_hub->regmap, P3H2x4x_TP0_SMBUS_AGNT_STS + i,
+ &target_port_status);
+ if (ret) {
+ dev_err(&i3cdev->dev, "target port read status failed %d\n", ret);
+ return;
+ }
+
+ /* process data receive buffer */
+ switch (target_port_status & BUF_RECEIVED_FLAG_MASK) {
+ case P3H2x4x_TARGET_BUF_CA_TF:
+ break;
+ case P3H2x4x_TARGET_BUF_0_RECEIVE:
+ p3h2x4x_read_smbus_agent_rx_buf(i3cdev, RCV_BUF_0, i, false);
+ break;
+ case P3H2x4x_TARGET_BUF_1_RECEIVE:
+ p3h2x4x_read_smbus_agent_rx_buf(i3cdev, RCV_BUF_1, i, false);
+ break;
+ case P3H2x4x_TARGET_BUF_0_1_RECEIVE:
+ p3h2x4x_read_smbus_agent_rx_buf(i3cdev, RCV_BUF_0, i, false);
+ p3h2x4x_read_smbus_agent_rx_buf(i3cdev, RCV_BUF_1, i, false);
+ break;
+ case P3H2x4x_TARGET_BUF_OVRFL:
+ p3h2x4x_read_smbus_agent_rx_buf(i3cdev, RCV_BUF_0, i, false);
+ p3h2x4x_read_smbus_agent_rx_buf(i3cdev, RCV_BUF_1, i, true);
+ dev_err(&i3cdev->dev, "Overflow, reading buffer zero and one\n");
+ break;
+ default:
+ regmap_write(p3h2x4x_i3c_hub->regmap,
+ P3H2x4x_TP0_SMBUS_AGNT_STS + i,
+ BUF_RECEIVED_FLAG_TF_MASK);
+ break;
+ }
+ }
+ }
+#endif
+}
+
+static int p3h2x4x_read_smbus_transaction_status(struct p3h2x4x_i3c_hub_dev *hub,
+ u8 target_port_status,
+ u8 data_length)
+{
+ u32 status_read;
+ u8 status;
+ int ret;
+
+ mutex_unlock(&hub->etx_mutex);
+ fsleep(P3H2x4x_SMBUS_400kHz_TRANSFER_TIMEOUT(data_length));
+ mutex_lock(&hub->etx_mutex);
+
+ ret = regmap_read(hub->regmap, target_port_status, &status_read);
+ if (ret)
+ return ret;
+
+ status = (u8)status_read;
+
+ status = (status & P3H2x4x_TP_TRANSACTION_CODE_MASK)
+ >> P3H2x4x_SMBUS_CNTRL_STATUS_TXN_SHIFT;
+
+ switch (status) {
+ case P3H2x4x_SMBUS_CNTRL_STATUS_TXN_OK:
+ return 0;
+ case P3H2x4x_SMBUS_CNTRL_STATUS_TXN_ADDR_NAK:
+ return -ENXIO;
+ case P3H2x4x_SMBUS_CNTRL_STATUS_TXN_DATA_NAK:
+ return -EIO;
+ case P3H2x4x_SMBUS_CNTRL_STATUS_TXN_SCL_TO:
+ return -ETIMEDOUT;
+ case P3H2x4x_SMBUS_CNTRL_STATUS_TXN_ARB_LOSS:
+ return -EAGAIN;
+ default:
+ return -EIO;
+ }
+}
+
+/**
+ * p3h2x4x_tp_i2c_xfer_msg() - This starts a SMBus write transaction by writing a descriptor
+ * and a message to the p3h2x4x registers. Controller buffer page is determined by multiplying the
+ * target port index by four and adding the base page number to it.
+ */
+static int p3h2x4x_tp_i2c_xfer_msg(struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub,
+ struct i2c_msg *xfers,
+ u8 target_port,
+ u8 nxfers_i, u8 rw)
+{
+ u8 controller_buffer_page = P3H2x4x_CONTROLLER_BUFFER_PAGE + 4 * target_port;
+ u8 target_port_status = P3H2x4x_TP0_SMBUS_AGNT_STS + target_port;
+ u8 desc[P3H2x4x_SMBUS_DESCRIPTOR_SIZE] = { 0 };
+ u8 transaction_type = P3H2x4x_SMBUS_400kHz;
+ int write_length, read_length;
+ u8 addr = xfers[nxfers_i].addr;
+ u8 rw_address = 2 * addr;
+ int ret;
+
+ if (rw == 2) { /* write and read */
+ write_length = xfers[nxfers_i].len;
+ read_length = xfers[nxfers_i + 1].len;
+ } else if (rw == 1) {
+ rw_address |= P3H2x4x_SET_BIT(0);
+ write_length = 0;
+ read_length = xfers[nxfers_i].len;
+ } else {
+ write_length = xfers[nxfers_i].len;
+ read_length = 0;
+ }
+
+ desc[0] = rw_address;
+ if (rw == 2)
+ desc[1] = transaction_type | P3H2x4x_SET_BIT(0);
+ else
+ desc[1] = transaction_type;
+ desc[2] = write_length;
+ desc[3] = read_length;
+
+ ret = regmap_write(p3h2x4x_i3c_hub->regmap, target_port_status,
+ P3H2x4x_TP_BUFFER_STATUS_MASK);
+ if (ret)
+ goto out;
+
+ ret = regmap_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_PAGE_PTR, controller_buffer_page);
+
+ if (ret)
+ goto out;
+
+ ret = regmap_bulk_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_CONTROLLER_AGENT_BUFF,
+ desc, P3H2x4x_SMBUS_DESCRIPTOR_SIZE);
+
+ if (ret)
+ goto out;
+
+ if (!(rw % 2)) {
+ ret = regmap_bulk_write(p3h2x4x_i3c_hub->regmap,
+ P3H2x4x_CONTROLLER_AGENT_BUFF_DATA,
+ xfers[nxfers_i].buf, xfers[nxfers_i].len);
+ if (ret)
+ goto out;
+ }
+
+ ret = regmap_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_TP_SMBUS_AGNT_TRANS_START,
+ p3h2x4x_i3c_hub->tp_bus[target_port].tp_mask);
+
+ if (ret)
+ goto out;
+
+ ret = p3h2x4x_read_smbus_transaction_status(p3h2x4x_i3c_hub,
+ target_port_status,
+ (write_length + read_length));
+ if (ret)
+ goto out;
+
+ if (rw) {
+ if (rw == 2)
+ nxfers_i += 1;
+
+ ret = regmap_bulk_read(p3h2x4x_i3c_hub->regmap,
+ P3H2x4x_CONTROLLER_AGENT_BUFF_DATA + write_length,
+ xfers[nxfers_i].buf, xfers[nxfers_i].len);
+ if (ret)
+ goto out;
+ }
+out:
+ int ret2;
+
+ ret2 = regmap_write(p3h2x4x_i3c_hub->regmap,
+ P3H2x4x_PAGE_PTR, 0x00);
+ if (!ret && ret2)
+ ret = ret2;
+
+ return ret;
+}
+
+/*
+ * This function will be called whenever you call I2C read, write APIs like
+ * i2c_master_send(), i2c_master_recv() etc.
+ */
+static s32 p3h2x4x_tp_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+{
+ int ret_sum = 0, ret;
+ u8 msg_count, rw;
+
+ struct tp_bus *bus = i2c_get_adapdata(adap);
+ struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = bus->p3h2x4x_i3c_hub;
+
+ guard(mutex)(&p3h2x4x_i3c_hub->etx_mutex);
+ guard(mutex)(&bus->port_mutex);
+
+ for (msg_count = 0; msg_count < num; msg_count++) {
+ if (msgs[msg_count].len > P3H2x4x_SMBUS_PAYLOAD_SIZE) {
+ dev_err(p3h2x4x_i3c_hub->dev,
+ "Message nr. %d not sent - length over %d bytes.\n",
+ msg_count, P3H2x4x_SMBUS_PAYLOAD_SIZE);
+ continue;
+ }
+
+ rw = (msgs[msg_count].flags & I2C_M_RD) ? 1 : 0;
+ if (!rw) {
+ /* If a read message is immediately followed by a write message to
+ * the same address, consider combining them into a single transaction.
+ */
+ if (msg_count + 1 < num &&
+ msgs[msg_count].addr == msgs[msg_count + 1].addr &&
+ (msgs[msg_count + 1].flags & I2C_M_RD)) {
+ rw = 2;
+ msg_count += 1;
+ ret_sum += 1;
+ }
+ }
+
+ ret = p3h2x4x_tp_i2c_xfer_msg(p3h2x4x_i3c_hub,
+ msgs,
+ bus->tp_port,
+ (rw == 2) ? (msg_count - 1) : msg_count,
+ rw);
+ if (ret)
+ return ret;
+
+ ret_sum++;
+ }
+ return ret_sum;
+}
+
+static u32 p3h2x4x_tp_smbus_funcs(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_BLOCK_DATA;
+}
+
+#if IS_ENABLED(CONFIG_I2C_SLAVE)
+static int p3h2x4x_tp_i2c_reg_slave(struct i2c_client *slave)
+{
+ struct tp_bus *bus = i2c_get_adapdata(slave->adapter);
+
+ if (bus->tp_smbus_client)
+ return -EBUSY;
+
+ bus->tp_smbus_client = slave;
+
+ return 0;
+}
+
+static int p3h2x4x_tp_i2c_unreg_slave(struct i2c_client *slave)
+{
+ struct tp_bus *bus = i2c_get_adapdata(slave->adapter);
+
+ bus->tp_smbus_client = NULL;
+
+ return 0;
+}
+#endif
+
+/*
+ * I2C algorithm Structure
+ */
+static struct i2c_algorithm p3h2x4x_tp_i2c_algorithm = {
+ .master_xfer = p3h2x4x_tp_i2c_xfer,
+#if IS_ENABLED(CONFIG_I2C_SLAVE)
+ .reg_slave = p3h2x4x_tp_i2c_reg_slave,
+ .unreg_slave = p3h2x4x_tp_i2c_unreg_slave,
+#endif
+ .functionality = p3h2x4x_tp_smbus_funcs,
+};
+
+/**
+ * p3h2x4x_tp_smbus_algo - add i2c adapter for target port who
+ * configured as SMBus.
+ * @hub: p3h2x4x device structure.
+ * Return: 0 in case of success, negative error code on failur.
+ */
+int p3h2x4x_tp_smbus_algo(struct p3h2x4x_i3c_hub_dev *hub)
+{
+ u8 tp, ibi_mask = 0;
+ int ret;
+
+ for (tp = 0; tp < P3H2x4x_TP_MAX_COUNT; tp++) {
+ if (!hub->tp_bus[tp].of_node ||
+ hub->hub_config.tp_config[tp].mode != P3H2x4x_TP_MODE_SMBUS)
+ continue;
+
+ /* Allocate adapter */
+ struct i2c_adapter *smbus_adapter =
+ devm_kzalloc(hub->dev, sizeof(*smbus_adapter), GFP_KERNEL);
+ if (!smbus_adapter)
+ return -ENOMEM;
+
+ /* Initialize adapter */
+ smbus_adapter->owner = THIS_MODULE;
+ smbus_adapter->class = I2C_CLASS_HWMON;
+ smbus_adapter->algo = &p3h2x4x_tp_i2c_algorithm;
+ smbus_adapter->dev.parent = hub->dev;
+ smbus_adapter->dev.of_node = hub->tp_bus[tp].of_node;
+ snprintf(smbus_adapter->name, sizeof(smbus_adapter->name),
+ "p3h2x4x-i3c-hub.tp-port-%d", tp);
+
+ i2c_set_adapdata(smbus_adapter, &hub->tp_bus[tp]);
+
+ /* Register adapter */
+ ret = i2c_add_adapter(smbus_adapter);
+ if (ret) {
+ devm_kfree(hub->dev, smbus_adapter);
+ return ret;
+ }
+
+ ibi_mask |= hub->tp_bus[tp].tp_mask;
+ hub->tp_bus[tp].is_registered = true;
+ hub->hub_config.tp_config[tp].ibi_en = true;
+ hub->tp_bus[tp].tp_smbus_adapter = smbus_adapter;
+ }
+
+ /*
+ * holding SDA low when both SMBus Target Agent received data buffers are full.
+ * This feature can be used as a flow-control mechanism for MCTP applications to
+ * avoid MCTP transmitters on Target Ports time out when the SMBus agent buffers
+ * are not serviced in time by upstream controller and only receives write message
+ * from its downstream ports.
+ */
+ ret = regmap_update_bits(hub->regmap, P3H2x4x_ONCHIP_TD_AND_SMBUS_AGNT_CONF,
+ P3H2x4x_TARGET_AGENT_DFT_IBI_CONF_MASK,
+ P3H2x4x_TARGET_AGENT_DFT_IBI_CONF);
+ if (ret)
+ return ret;
+
+ return regmap_write(hub->regmap, P3H2x4x_TP_SMBUS_AGNT_IBI_CONFIG, ibi_mask);
+}
diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
index 971d53349b6f..6188082599dd 100644
--- a/include/linux/i3c/device.h
+++ b/include/linux/i3c/device.h
@@ -85,6 +85,7 @@ struct i3c_xfer {
*/
enum i3c_dcr {
I3C_DCR_GENERIC_DEVICE = 0,
+ I3C_DCR_HUB = 194,
};
#define I3C_PID_MANUF_ID(pid) (((pid) & GENMASK_ULL(47, 33)) >> 33)
--
2.25.1
^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality
2026-03-10 6:57 ` [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality Lakshay Piplani
@ 2026-03-10 9:07 ` Lee Jones
2026-03-10 18:28 ` Frank Li
` (2 subsequent siblings)
3 siblings, 0 replies; 26+ messages in thread
From: Lee Jones @ 2026-03-10 9:07 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, Frank.Li, lgirdwood, vikash.bansal,
priyanka.jain, aman.kumarpandey
On Tue, 10 Mar 2026, Lakshay Piplani wrote:
> From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> Add I3C hub functionality for the NXP P3H2x4x family of multiport hubs.
> These devices support downstream target ports that can be configured
> as I3C, I2C, or SMBus.
>
> This driver enables:
> - I3C/I2C communication between host and hub
> - Transparent communication with downstream devices
> - Target port configuration (I3C/I2C/SMBus)
> - MCTP device support
> - In-band interrupt handling
>
> P3H2440/P3H2441 support 4 target ports.
> P3H2840/P3H2841 support 8 target ports.
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
> Signed-off-by: Lakshay Piplani <lakshay.piplani@nxp.com>
Where is your cover letter?
Why did I have to scour 7 patches just to find out that there is nothing
for me to do and that I shouldn't have been sent the set in the first
place?
Please provide cover letters for large sets like this.
--
Lee Jones [李琼斯]
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality
2026-03-10 6:57 ` [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality Lakshay Piplani
2026-03-10 9:07 ` Lee Jones
@ 2026-03-10 18:28 ` Frank Li
2026-03-10 22:10 ` kernel test robot
2026-03-10 23:26 ` kernel test robot
3 siblings, 0 replies; 26+ messages in thread
From: Frank Li @ 2026-03-10 18:28 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, lgirdwood, vikash.bansal,
priyanka.jain, aman.kumarpandey
On Tue, Mar 10, 2026 at 12:27:27PM +0530, Lakshay Piplani wrote:
> From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> Add I3C hub functionality for the NXP P3H2x4x family of multiport hubs.
> These devices support downstream target ports that can be configured
> as I3C, I2C, or SMBus.
>
> This driver enables:
> - I3C/I2C communication between host and hub
> - Transparent communication with downstream devices
> - Target port configuration (I3C/I2C/SMBus)
> - MCTP device support
> - In-band interrupt handling
>
> P3H2440/P3H2441 support 4 target ports.
> P3H2840/P3H2841 support 8 target ports.
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
> Signed-off-by: Lakshay Piplani <lakshay.piplani@nxp.com>
>
> ---
...
> +
> +static int find_close(int val, const int *tbl, int size)
> +{
> + int best = 0, i;
> +
> + for (i = 1; i < size; i++)
> + if (abs(tbl[i] - val) < abs(tbl[best] - val))
> + best = i;
> +
> + return best;
> +}
> +
There find_closest() in
/ include / linux / util_macros.h
Can you reuse it?
> +static u8 p3h2x4x_pullup_dt_to_reg(int dt_value)
> +{
> + return find_close(dt_value, p3h2x4x_pullup_tbl,
> + ARRAY_SIZE(p3h2x4x_pullup_tbl));
> +}
> +
> +static u8 p3h2x4x_io_strength_dt_to_reg(int dt_value)
> +{
> + return find_close(dt_value, p3h2x4x_io_strength_tbl,
> + ARRAY_SIZE(p3h2x4x_io_strength_tbl));
> +}
> +
...
> +
> + p3h2x4x_i3c_hub->rp3h2x4x.rcp0 = devm_regulator_get_optional(dev, "vcc1");
> + if (IS_ERR(p3h2x4x_i3c_hub->rp3h2x4x.rcp0)) {
> + p3h2x4x_i3c_hub->rp3h2x4x.rcp0 = NULL;
> + dev_dbg(dev, "vdd1-supply not found\n");
> + }
> +
> + p3h2x4x_i3c_hub->rp3h2x4x.rcp1 = devm_regulator_get_optional(dev, "vcc2");
> + if (IS_ERR(p3h2x4x_i3c_hub->rp3h2x4x.rcp1)) {
> + p3h2x4x_i3c_hub->rp3h2x4x.rcp1 = NULL;
> + dev_dbg(dev, "vdd2-supply not found\n");
> + }
> +
> + p3h2x4x_i3c_hub->rp3h2x4x.rtp0145 = devm_regulator_get_optional(dev, "vcc3");
> + if (IS_ERR(p3h2x4x_i3c_hub->rp3h2x4x.rtp0145)) {
> + p3h2x4x_i3c_hub->rp3h2x4x.rtp0145 = NULL;
> + dev_dbg(dev, "vdd3-supply not found\n");
> + }
> +
> + p3h2x4x_i3c_hub->rp3h2x4x.rtp2367 = devm_regulator_get_optional(dev, "vcc4");
> + if (IS_ERR(p3h2x4x_i3c_hub->rp3h2x4x.rtp2367)) {
> + p3h2x4x_i3c_hub->rp3h2x4x.rtp2367 = NULL;
> + dev_dbg(dev, "vdd4-supply not found\n");
> + }
> +
> + /* Enable regulators */
> + if (p3h2x4x_i3c_hub->rp3h2x4x.rcp0) {
> + ret = regulator_enable(p3h2x4x_i3c_hub->rp3h2x4x.rcp0);
can you use devm_regulator_get_enable_optional() to combine get and enable
by one call?
> diff --git a/drivers/i3c/hub/p3h2840_i3c_hub_i3c.c b/drivers/i3c/hub/p3h2840_i3c_hub_i3c.c
> new file mode 100644
> index 000000000000..833bc0bebc4e
> --- /dev/null
> +++ b/drivers/i3c/hub/p3h2840_i3c_hub_i3c.c
> @@ -0,0 +1,119 @@
...
> +int p3h2x4x_tp_i3c_algo(struct p3h2x4x_i3c_hub_dev *p3h2x4x_hub)
> +{
> + struct i3c_master_controller *parent = i3c_dev_get_master(p3h2x4x_hub->i3cdev->desc);
> + u8 tp, ntwk_mask = 0;
> + int ret;
> +
> + p3h2x4x_hub->hub = i3c_hub_init(parent,
> + &p3h2x4x_hub_ops,
> + p3h2x4x_hub->i3cdev);
> +
> + if (IS_ERR(p3h2x4x_hub->hub))
> + return PTR_ERR(p3h2x4x_hub->hub);
> +
> + for (tp = 0; tp < P3H2x4x_TP_MAX_COUNT; tp++) {
> + if (!p3h2x4x_hub->tp_bus[tp].of_node ||
> + p3h2x4x_hub->hub_config.tp_config[tp].mode != P3H2x4x_TP_MODE_I3C)
> + continue;
> +
> + /* Assign DT node for this TP */
> + p3h2x4x_hub->dev->of_node = p3h2x4x_hub->tp_bus[tp].of_node;
> +
> + struct i3c_hub_controller *hub_controller =
> + &p3h2x4x_hub->tp_bus[tp].hub_controller;
> + struct i3c_master_controller *controller = &hub_controller->controller;
> +
> + hub_controller->parent = parent;
> + hub_controller->hub = p3h2x4x_hub->hub;
> +
> + dev_set_drvdata(&controller->dev, hub_controller);
> +
> + ret = i3c_master_register(controller,
> + p3h2x4x_hub->dev,
> + i3c_hub_master_ops(),
> + false);
> +
> + if (ret)
> + return ret;
> +
> + /* Perform DAA */
> + ret = i3c_master_do_daa(parent);
> + if (ret)
> + return ret;
> +
> + ntwk_mask |= p3h2x4x_hub->tp_bus[tp].tp_mask;
> + p3h2x4x_hub->tp_bus[tp].is_registered = true;
> + p3h2x4x_hub->hub_config.tp_config[tp].always_enable = true;
> + }
> +
> + ret = i3c_device_request_ibi(p3h2x4x_hub->i3cdev, &p3h2x4x_ibireq);
> + if (ret)
> + return ret;
Need unregister_i3c at error path, or add API devm_i3c_master_register().
> +
> + ret = i3c_device_enable_ibi(p3h2x4x_hub->i3cdev);
> + if (ret)
> + return ret;
> +
> + return regmap_write(p3h2x4x_hub->regmap, P3H2x4x_TP_NET_CON_CONF, ntwk_mask);
> +}
> diff --git a/drivers/i3c/hub/p3h2840_i3c_hub_smbus.c b/drivers/i3c/hub/p3h2840_i3c_hub_smbus.c
> new file mode 100644
> index 000000000000..75803a59fd6c
> --- /dev/null
> +++ b/drivers/i3c/hub/p3h2840_i3c_hub_smbus.c
> @@ -0,0 +1,423 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2025 NXP
> + * This P3H2x4x driver file contain functions for SMBus/I2C virtual Bus creation and read/write.
> + */
> +#include <linux/mfd/p3h2840.h>
> +#include <linux/regmap.h>
> +
> +#include "p3h2840_i3c_hub.h"
> +
> +#if IS_ENABLED(CONFIG_I2C_SLAVE)
why I3C_SLAVE here?
" This enables Linux to act as an I2C slave device. Note that your I2C
bus master driver also needs to support this functionality. Please
read Documentation/i2c/slave-interface.rst for further details.
"
I2C_SLAVE is for slave mode of i2c
> +/**
> + * p3h2x4x_ibi_handler - IBI handler.
> + * @i3cdev: i3c device.
> + * @payload: two byte IBI payload data.
> + *
> + */
> +void p3h2x4x_ibi_handler(struct i3c_device *i3cdev,
> + const struct i3c_ibi_payload *payload)
> +{
> + u32 payload_byte_one = (*(int *)payload->data);
> +
> + if (!(payload_byte_one & P3H2x4x_SMBUS_AGENT_EVENT_FLAG_STATUS))
> + return;
> +
> +#if IS_ENABLED(CONFIG_I2C_SLAVE)
The same here
> + struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub = dev_get_drvdata(&i3cdev->dev);
> + u32 target_port_status, payload_byte_two;
> + u32 ret, i;
> +
> + if (!p3h2x4x_i3c_hub || !p3h2x4x_i3c_hub->regmap)
> + return;
> +
...
> +/**
> + * p3h2x4x_tp_i2c_xfer_msg() - This starts a SMBus write transaction by writing a descriptor
> + * and a message to the p3h2x4x registers. Controller buffer page is determined by multiplying the
> + * target port index by four and adding the base page number to it.
> + */
> +static int p3h2x4x_tp_i2c_xfer_msg(struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub,
> + struct i2c_msg *xfers,
> + u8 target_port,
> + u8 nxfers_i, u8 rw)
> +{
> + u8 controller_buffer_page = P3H2x4x_CONTROLLER_BUFFER_PAGE + 4 * target_port;
> + u8 target_port_status = P3H2x4x_TP0_SMBUS_AGNT_STS + target_port;
> + u8 desc[P3H2x4x_SMBUS_DESCRIPTOR_SIZE] = { 0 };
> + u8 transaction_type = P3H2x4x_SMBUS_400kHz;
> + int write_length, read_length;
> + u8 addr = xfers[nxfers_i].addr;
> + u8 rw_address = 2 * addr;
> + int ret;
> +
> + if (rw == 2) { /* write and read */
> + write_length = xfers[nxfers_i].len;
> + read_length = xfers[nxfers_i + 1].len;
> + } else if (rw == 1) {
> + rw_address |= P3H2x4x_SET_BIT(0);
> + write_length = 0;
> + read_length = xfers[nxfers_i].len;
> + } else {
> + write_length = xfers[nxfers_i].len;
> + read_length = 0;
> + }
> +
> + desc[0] = rw_address;
> + if (rw == 2)
> + desc[1] = transaction_type | P3H2x4x_SET_BIT(0);
> + else
> + desc[1] = transaction_type;
> + desc[2] = write_length;
> + desc[3] = read_length;
can you define index 0, 1, 2, 3 as enum
Frank
> +
> + ret = regmap_write(p3h2x4x_i3c_hub->regmap, target_port_status,
> + P3H2x4x_TP_BUFFER_STATUS_MASK);
> + if (ret)
> + goto out;
> +
> +static struct i2c_algorithm p3h2x4x_tp_i2c_algorithm = {
> + .master_xfer = p3h2x4x_tp_i2c_xfer,
> +#if IS_ENABLED(CONFIG_I2C_SLAVE)
> + .reg_slave = p3h2x4x_tp_i2c_reg_slave,
> + .unreg_slave = p3h2x4x_tp_i2c_unreg_slave,
> +#endif
> + .functionality = p3h2x4x_tp_smbus_funcs,
> +};
> +
> +/**
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality
2026-03-10 6:57 ` [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality Lakshay Piplani
2026-03-10 9:07 ` Lee Jones
2026-03-10 18:28 ` Frank Li
@ 2026-03-10 22:10 ` kernel test robot
2026-03-10 23:26 ` kernel test robot
3 siblings, 0 replies; 26+ messages in thread
From: kernel test robot @ 2026-03-10 22:10 UTC (permalink / raw)
To: Lakshay Piplani, linux-kernel, linux-i3c, alexandre.belloni,
krzk+dt, robh, conor+dt, devicetree, broonie, lee, Frank.Li,
lgirdwood
Cc: oe-kbuild-all, vikash.bansal, priyanka.jain, aman.kumarpandey,
lakshay.piplani
Hi Lakshay,
kernel test robot noticed the following build errors:
[auto build test ERROR on i3c/i3c/next]
[also build test ERROR on lee-mfd/for-mfd-next broonie-regulator/for-next linus/master v7.0-rc3 next-20260310]
[cannot apply to lee-mfd/for-mfd-fixes]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lakshay-Piplani/i3c-master-Add-the-APIs-to-support-I3C-hub/20260310-150040
base: https://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux.git i3c/next
patch link: https://lore.kernel.org/r/20260310065727.3759342-7-lakshay.piplani%40nxp.com
patch subject: [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality
config: riscv-randconfig-001-20260311 (https://download.01.org/0day-ci/archive/20260311/202603110643.VWCcqjaP-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260311/202603110643.VWCcqjaP-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603110643.VWCcqjaP-lkp@intel.com/
All errors (new ones prefixed by >>):
drivers/i3c/hub/p3h2840_i3c_hub_smbus.c: In function 'p3h2x4x_tp_i2c_xfer_msg':
>> drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:263:2: error: a label can only be part of a statement and a declaration is not a statement
int ret2;
^~~
vim +263 drivers/i3c/hub/p3h2840_i3c_hub_smbus.c
176
177 /**
178 * p3h2x4x_tp_i2c_xfer_msg() - This starts a SMBus write transaction by writing a descriptor
179 * and a message to the p3h2x4x registers. Controller buffer page is determined by multiplying the
180 * target port index by four and adding the base page number to it.
181 */
182 static int p3h2x4x_tp_i2c_xfer_msg(struct p3h2x4x_i3c_hub_dev *p3h2x4x_i3c_hub,
183 struct i2c_msg *xfers,
184 u8 target_port,
185 u8 nxfers_i, u8 rw)
186 {
187 u8 controller_buffer_page = P3H2x4x_CONTROLLER_BUFFER_PAGE + 4 * target_port;
188 u8 target_port_status = P3H2x4x_TP0_SMBUS_AGNT_STS + target_port;
189 u8 desc[P3H2x4x_SMBUS_DESCRIPTOR_SIZE] = { 0 };
190 u8 transaction_type = P3H2x4x_SMBUS_400kHz;
191 int write_length, read_length;
192 u8 addr = xfers[nxfers_i].addr;
193 u8 rw_address = 2 * addr;
194 int ret;
195
196 if (rw == 2) { /* write and read */
197 write_length = xfers[nxfers_i].len;
198 read_length = xfers[nxfers_i + 1].len;
199 } else if (rw == 1) {
200 rw_address |= P3H2x4x_SET_BIT(0);
201 write_length = 0;
202 read_length = xfers[nxfers_i].len;
203 } else {
204 write_length = xfers[nxfers_i].len;
205 read_length = 0;
206 }
207
208 desc[0] = rw_address;
209 if (rw == 2)
210 desc[1] = transaction_type | P3H2x4x_SET_BIT(0);
211 else
212 desc[1] = transaction_type;
213 desc[2] = write_length;
214 desc[3] = read_length;
215
216 ret = regmap_write(p3h2x4x_i3c_hub->regmap, target_port_status,
217 P3H2x4x_TP_BUFFER_STATUS_MASK);
218 if (ret)
219 goto out;
220
221 ret = regmap_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_PAGE_PTR, controller_buffer_page);
222
223 if (ret)
224 goto out;
225
226 ret = regmap_bulk_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_CONTROLLER_AGENT_BUFF,
227 desc, P3H2x4x_SMBUS_DESCRIPTOR_SIZE);
228
229 if (ret)
230 goto out;
231
232 if (!(rw % 2)) {
233 ret = regmap_bulk_write(p3h2x4x_i3c_hub->regmap,
234 P3H2x4x_CONTROLLER_AGENT_BUFF_DATA,
235 xfers[nxfers_i].buf, xfers[nxfers_i].len);
236 if (ret)
237 goto out;
238 }
239
240 ret = regmap_write(p3h2x4x_i3c_hub->regmap, P3H2x4x_TP_SMBUS_AGNT_TRANS_START,
241 p3h2x4x_i3c_hub->tp_bus[target_port].tp_mask);
242
243 if (ret)
244 goto out;
245
246 ret = p3h2x4x_read_smbus_transaction_status(p3h2x4x_i3c_hub,
247 target_port_status,
248 (write_length + read_length));
249 if (ret)
250 goto out;
251
252 if (rw) {
253 if (rw == 2)
254 nxfers_i += 1;
255
256 ret = regmap_bulk_read(p3h2x4x_i3c_hub->regmap,
257 P3H2x4x_CONTROLLER_AGENT_BUFF_DATA + write_length,
258 xfers[nxfers_i].buf, xfers[nxfers_i].len);
259 if (ret)
260 goto out;
261 }
262 out:
> 263 int ret2;
264
265 ret2 = regmap_write(p3h2x4x_i3c_hub->regmap,
266 P3H2x4x_PAGE_PTR, 0x00);
267 if (!ret && ret2)
268 ret = ret2;
269
270 return ret;
271 }
272
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality
2026-03-10 6:57 ` [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality Lakshay Piplani
` (2 preceding siblings ...)
2026-03-10 22:10 ` kernel test robot
@ 2026-03-10 23:26 ` kernel test robot
3 siblings, 0 replies; 26+ messages in thread
From: kernel test robot @ 2026-03-10 23:26 UTC (permalink / raw)
To: Lakshay Piplani, linux-kernel, linux-i3c, alexandre.belloni,
krzk+dt, robh, conor+dt, devicetree, broonie, lee, Frank.Li,
lgirdwood
Cc: oe-kbuild-all, vikash.bansal, priyanka.jain, aman.kumarpandey,
lakshay.piplani
Hi Lakshay,
kernel test robot noticed the following build warnings:
[auto build test WARNING on i3c/i3c/next]
[also build test WARNING on lee-mfd/for-mfd-next broonie-regulator/for-next linus/master v7.0-rc3 next-20260310]
[cannot apply to lee-mfd/for-mfd-fixes]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lakshay-Piplani/i3c-master-Add-the-APIs-to-support-I3C-hub/20260310-150040
base: https://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux.git i3c/next
patch link: https://lore.kernel.org/r/20260310065727.3759342-7-lakshay.piplani%40nxp.com
patch subject: [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality
config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20260311/202603110741.nkI3lGfN-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260311/202603110741.nkI3lGfN-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603110741.nkI3lGfN-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_i3c.c:62 function parameter 'p3h2x4x_hub' not described in 'p3h2x4x_tp_i3c_algo'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_i3c.c:62 function parameter 'p3h2x4x_hub' not described in 'p3h2x4x_tp_i3c_algo'
--
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'p3h2x4x_i3c_hub' not described in 'p3h2x4x_tp_i2c_xfer_msg'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'xfers' not described in 'p3h2x4x_tp_i2c_xfer_msg'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'target_port' not described in 'p3h2x4x_tp_i2c_xfer_msg'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'nxfers_i' not described in 'p3h2x4x_tp_i2c_xfer_msg'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'rw' not described in 'p3h2x4x_tp_i2c_xfer_msg'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'p3h2x4x_i3c_hub' not described in 'p3h2x4x_tp_i2c_xfer_msg'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'xfers' not described in 'p3h2x4x_tp_i2c_xfer_msg'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'target_port' not described in 'p3h2x4x_tp_i2c_xfer_msg'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'nxfers_i' not described in 'p3h2x4x_tp_i2c_xfer_msg'
>> Warning: drivers/i3c/hub/p3h2840_i3c_hub_smbus.c:185 function parameter 'rw' not described in 'p3h2x4x_tp_i2c_xfer_msg'
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub
2026-03-10 6:57 [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub Lakshay Piplani
` (5 preceding siblings ...)
2026-03-10 6:57 ` [PATCH v6 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality Lakshay Piplani
@ 2026-03-10 14:40 ` kernel test robot
2026-03-10 16:46 ` Frank Li
7 siblings, 0 replies; 26+ messages in thread
From: kernel test robot @ 2026-03-10 14:40 UTC (permalink / raw)
To: Lakshay Piplani, linux-kernel, linux-i3c, alexandre.belloni,
krzk+dt, robh, conor+dt, devicetree, broonie, lee, Frank.Li,
lgirdwood
Cc: oe-kbuild-all, vikash.bansal, priyanka.jain, aman.kumarpandey,
lakshay.piplani
Hi Lakshay,
kernel test robot noticed the following build warnings:
[auto build test WARNING on i3c/i3c/next]
[also build test WARNING on lee-mfd/for-mfd-next broonie-regulator/for-next linus/master lee-mfd/for-mfd-fixes v7.0-rc3 next-20260309]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lakshay-Piplani/i3c-master-Add-the-APIs-to-support-I3C-hub/20260310-150040
base: https://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux.git i3c/next
patch link: https://lore.kernel.org/r/20260310065727.3759342-1-lakshay.piplani%40nxp.com
patch subject: [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub
config: loongarch-randconfig-001-20260310 (https://download.01.org/0day-ci/archive/20260310/202603102243.IVWJtjqQ-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 13.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260310/202603102243.IVWJtjqQ-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603102243.IVWJtjqQ-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> Warning: drivers/i3c/master.c:3197 expecting prototype for i3c_dev_disable_ibi(). Prototype was for i3c_dev_disable_ibi_locked() instead
>> Warning: drivers/i3c/master.c:3263 expecting prototype for i3c_dev_request_ibi(). Prototype was for i3c_dev_request_ibi_locked() instead
>> Warning: drivers/i3c/master.c:3312 expecting prototype for i3c_dev_free_ibi(). Prototype was for i3c_dev_free_ibi_locked() instead
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub
2026-03-10 6:57 [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub Lakshay Piplani
` (6 preceding siblings ...)
2026-03-10 14:40 ` [PATCH v6 1/7] i3c: master: Expose the APIs to support I3C hub kernel test robot
@ 2026-03-10 16:46 ` Frank Li
7 siblings, 0 replies; 26+ messages in thread
From: Frank Li @ 2026-03-10 16:46 UTC (permalink / raw)
To: Lakshay Piplani
Cc: linux-kernel, linux-i3c, alexandre.belloni, krzk+dt, robh,
conor+dt, devicetree, broonie, lee, lgirdwood, vikash.bansal,
priyanka.jain, aman.kumarpandey
On Tue, Mar 10, 2026 at 12:27:21PM +0530, Lakshay Piplani wrote:
> From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> Expose the below APIs to support I3C hub.
>
> 1) i3c_dev_enable_ibi_locked()
> 2) i3c_dev_disable_ibi_locked()
> 3) i3c_dev_request_ibi_locked()
> 4) i3c_dev_free_ibi_locked()
> 5) i3c_master_reattach_i3c_dev()
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> ---
> Changes in v6:
> - Split the patch into two parts:
> 1) expose the existing API
> 2) add new APIs.
>
> Changes in v5:
> - No change
>
> Changes in v4:
> - Updated I3C master to handle hub support
> ---
> ---
> drivers/i3c/master.c | 70 ++++++++++++++++++++++++++++++++++++--
> include/linux/i3c/master.h | 2 ++
> 2 files changed, 70 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index 9e6be49bebb2..886637757c26 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -1619,8 +1619,23 @@ static int i3c_master_attach_i3c_dev(struct i3c_master_controller *master,
> return 0;
> }
>
> -static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
> - u8 old_dyn_addr)
> +/**
> + * i3c_master_reattach_i3c_dev() - reattach an I3C device with a new address
> + * @dev: I3C device descriptor to reattach
> + * @old_dyn_addr: previous dynamic address of the device
> + *
> + * This function reattaches an existing I3C device to the bus when its dynamic
> + * address has changed. It updates the bus address slot status accordingly:
> + * - Marks the new dynamic address as occupied by an I3C device.
> + * - Frees the old dynamic address slot if applicable.
> + *
> + * This function must be called with the bus lock held in write mode.
> + *
> + * Return: 0 on success, or a negative error code if reattachment fails
> + * (e.g. -EBUSY if the new address slot is not free).
> + */
> +int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
> + u8 old_dyn_addr)
> {
> struct i3c_master_controller *master = i3c_dev_get_master(dev);
> int ret;
> @@ -1644,6 +1659,7 @@ static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(i3c_master_reattach_i3c_dev);
>
> static void i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev)
> {
> @@ -3168,6 +3184,16 @@ int i3c_dev_do_xfers_locked(struct i3c_dev_desc *dev, struct i3c_xfer *xfers,
> return master->ops->i3c_xfers(dev, xfers, nxfers, mode);
> }
>
> +/**
> + * i3c_dev_disable_ibi() - Disable IBIs coming from a specific device
> + * @dev: device on which IBIs should be disabled
> + *
> + * This function disable IBIs coming from a specific device and wait for
> + * all pending IBIs to be processed.
> + *
> + * Context: Must be called with mutex_lock(&dev->desc->ibi_lock) held.
> + * Return: 0 in case of success, a negative error core otherwise.
> + */
> int i3c_dev_disable_ibi_locked(struct i3c_dev_desc *dev)
> {
> struct i3c_master_controller *master;
> @@ -3189,7 +3215,22 @@ int i3c_dev_disable_ibi_locked(struct i3c_dev_desc *dev)
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(i3c_dev_disable_ibi_locked);
>
> +/**
> + * i3c_dev_enable_ibi_locked() - Enable IBIs from a specific device (lock held)
> + * @dev: device on which IBIs should be enabled
> + *
> + * This function enable IBIs coming from a specific device and wait for
> + * all pending IBIs to be processed. This should be called on a device
> + * where i3c_device_request_ibi() has succeeded.
> + *
> + * Note that IBIs from this device might be received before this function
> + * returns to its caller.
> + *
> + * Context: Must be called with mutex_lock(&dev->desc->ibi_lock) held.
> + * Return: 0 on success, or a negative error code on failure.
> + */
> int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev)
> {
> struct i3c_master_controller *master = i3c_dev_get_master(dev);
> @@ -3204,7 +3245,20 @@ int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev)
>
> return ret;
> }
> +EXPORT_SYMBOL_GPL(i3c_dev_enable_ibi_locked);
>
> +/**
> + * i3c_dev_request_ibi() - Request an IBI
> + * @dev: device for which we should enable IBIs
> + * @req: setup requested for this IBI
> + *
> + * This function is responsible for pre-allocating all resources needed to
> + * process IBIs coming from @dev. When this function returns, the IBI is not
> + * enabled until i3c_device_enable_ibi() is called.
> + *
> + * Context: Must be called with mutex_lock(&dev->desc->ibi_lock) held.
> + * Return: 0 in case of success, a negative error core otherwise.
> + */
> int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev,
> const struct i3c_ibi_setup *req)
> {
> @@ -3243,7 +3297,18 @@ int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev,
>
> return ret;
> }
> +EXPORT_SYMBOL_GPL(i3c_dev_request_ibi_locked);
>
> +/**
> + * i3c_dev_free_ibi() - Free all resources needed for IBI handling
> + * @dev: device on which you want to release IBI resources
> + *
> + * This function is responsible for de-allocating resources previously
> + * allocated by i3c_device_request_ibi(). It should be called after disabling
> + * IBIs with i3c_device_disable_ibi().
> + *
> + * Context: Must be called with mutex_lock(&dev->desc->ibi_lock) held.
> + */
> void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev)
> {
> struct i3c_master_controller *master = i3c_dev_get_master(dev);
> @@ -3274,6 +3339,7 @@ void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev)
> kfree(dev->ibi);
> dev->ibi = NULL;
> }
> +EXPORT_SYMBOL_GPL(i3c_dev_free_ibi_locked);
>
> static int __init i3c_init(void)
> {
> diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
> index 592b646f6134..aeccec171e64 100644
> --- a/include/linux/i3c/master.h
> +++ b/include/linux/i3c/master.h
> @@ -613,6 +613,8 @@ void i3c_master_dma_unmap_single(struct i3c_dma *dma_xfer);
> DEFINE_FREE(i3c_master_dma_unmap_single, void *,
> if (_T) i3c_master_dma_unmap_single(_T))
>
> +int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
> + u8 old_dyn_addr);
how about other functions? such as i3c_dev_request_ibi_locked()? All
export API should in header files.
Frank
> int i3c_master_set_info(struct i3c_master_controller *master,
> const struct i3c_device_info *info);
>
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 26+ messages in thread