[PATCH v3 1/2] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support
Aman Kumar Pandey
aman.kumarpandey at nxp.com
Fri Aug 8 06:20:44 PDT 2025
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 at nxp.com>
Signed-off-by: Vikash Bansal <vikash.bansal at nxp.com>
---
V1 -> V2: Cleaned up coding style and addressed review comments
V2 -> V3: Added mfd device support for i3c hub and regulator.
---
.../bindings/mfd/nxp,p3h2840-i3c-hub.yaml | 320 ++++++++++++++++++
MAINTAINERS | 8 +
2 files changed, 328 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/nxp,p3h2840-i3c-hub.yaml
diff --git a/Documentation/devicetree/bindings/mfd/nxp,p3h2840-i3c-hub.yaml b/Documentation/devicetree/bindings/mfd/nxp,p3h2840-i3c-hub.yaml
new file mode 100644
index 000000000000..490595c94627
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/nxp,p3h2840-i3c-hub.yaml
@@ -0,0 +1,320 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2025 NXP
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/nxp,p3h2840-i3c-hub.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP P3H2X4X I3C HUB
+
+maintainers:
+ - Aman Kumar Pandey <aman.kumarpandey at nxp.com>
+ - Vikash Bansal <vikash.bansal at 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: i3c.yaml#
+
+properties:
+ compatible:
+ items:
+ - const: nxp,p3h2840
+
+ cp0-ldo-microvolt:
+ description:
+ Selects the voltage for controller Port 0, in microvolts.
+ enum: [1000000, 1100000, 1200000, 1800000]
+ default: 1000000
+
+ cp1-ldo-microvolt:
+ description:
+ Selects the voltage for controller Port 1, in microvolts.
+ enum: [1000000, 1100000, 1200000, 1800000]
+ default: 1000000
+
+ tp0145-ldo-microvolt:
+ description:
+ Selects the voltage for target Port 0/1/4/5, in microvolts.
+ enum: [1000000, 1100000, 1200000, 1800000]
+ default: 1000000
+
+ tp2367-ldo-microvolt:
+ description:
+ Selects the voltage for target Port 2/3/6/7, in microvolts.
+ enum: [1000000, 1100000, 1200000, 1800000]
+ default: 1000000
+
+ 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
+
+ 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
+
+ cp0-io-strength-ohms:
+ description:
+ Selects the IO drive strength for controller Port 0, in ohms.
+ enum: [20, 30, 40, 50]
+ default: 20
+
+ cp1-io-strength-ohms:
+ description:
+ Selects the IO drive strength for controller Port 1, in ohms.
+ enum: [20, 30, 40, 50]
+ default: 20
+
+ 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
+
+ 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
+
+ cp0-supply:
+ description: Phandle to voltage regulator providing power to controller port 0.
+
+ cp1-supply:
+ description: Phandle to voltage regulator providing power to controller port 1.
+
+ tp0145-supply:
+ description: Phandle to voltage regulator providing power to target port 0/1/4/5.
+
+ tp2367-supply:
+ description: Phandle to voltage regulator providing power to target port 2/3/6/7.
+
+ regulators:
+ type: object
+ additionalProperties: false
+
+ properties:
+ cp0:
+ type: object
+ $ref: /schemas/regulator/regulator.yaml#
+ unevaluatedProperties: false
+
+ cp1:
+ type: object
+ $ref: /schemas/regulator/regulator.yaml#
+ unevaluatedProperties: false
+
+ tp0145:
+ type: object
+ $ref: /schemas/regulator/regulator.yaml#
+ unevaluatedProperties: false
+
+ tp2367:
+ type: object
+ $ref: /schemas/regulator/regulator.yaml#
+ unevaluatedProperties: false
+
+patternProperties:
+ "@[0-7]$":
+ type: object
+ additionalProperties: false
+ description:
+ I3C HUB Target Port child, should be named as target-port@<target-port-id>
+
+ properties:
+ reg:
+ description:
+ The I3C HUB Target Port number.
+ minimum: 0
+ maximum: 0x07
+
+ mode:
+ enum: [i3c, smbus, i2c, gpio]
+ description:
+ I3C HUB Target Port mode setting to control Target Port functionality.
+ As per now it is only supporting SMBus, i2c and i3c( i2c mode will work
+ with hub network).
+
+ pullup-enable:
+ type: boolean
+ description:
+ Enables the on-die pull-up for Target Port.
+
+ ibi-enable:
+ type: boolean
+ description:
+ Enables the IBI for Target Port.
+
+ local-dev:
+ $ref: /schemas/types.yaml#/definitions/uint8-array
+ description:
+ SMBus Target Agent can discard transactions of downstream device and not generate an IBI to upstream I3C Hub
+ Controller Port. Up to 8 device (addresses) can be configured as local Devices.
+
+ This property is optional. If not provided, local device list will empty.
+
+ hub_bridge_en:
+ type: boolean
+ description:
+ Enables the hub network (Controller port -> target port).
+
+ patternProperties:
+ "@[0-9a-f]+$":
+ type: object
+ additionalProperties: false
+ description: |
+ I2C child, should be named: <device-type>@<i2c-address>
+
+ properties:
+ compatible:
+ description:
+ Compatible of the I2C/SMBus downstream device.
+
+ reg:
+ description: |
+ I2C address, Downstream device address which are connected to target port.
+ minimum: 0
+ maximum: 0x7f
+
+ required:
+ - compatible
+ - reg
+
+ "@[0-9a-f]+,[0-9a-f]+$":
+ type: object
+ additionalProperties: false
+ description: |
+ I3C child, should be named: <device-type>@<static-i2c-address>,<i3c-pid>
+
+ properties:
+ reg:
+ items:
+ - items:
+ - description:
+ Encodes the static I2C address. Should be 0 if the device does
+ not have one (0 is not a valid I2C address).
+ minimum: 0
+ maximum: 0x7f
+ - description: |
+ First half of the Provisioned ID (following the PID
+ definition provided by the I3C specification).
+
+ Contains the manufacturer ID left-shifted by 1.
+ - description: |
+ Second half of the Provisioned ID (following the PID
+ definition provided by the I3C specification).
+
+ Contains the ORing of the part ID left-shifted by 16,
+ the instance ID left-shifted by 12 and extra information.
+
+ assigned-address:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 0x1
+ maximum: 0xff
+ description:
+ Dynamic address to be assigned to this device. In case static address is
+ present (first cell of the reg property != 0), this address is assigned
+ through SETDASA. If static address is not present, this address is assigned
+ through SETNEWDA after assigning a temporary address via ENTDAA.
+
+ required:
+ - reg
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ i3c {
+ #address-cells = <3>;
+ #size-cells = <0>;
+
+ hub at 70,236153000c2 {
+ reg = <0x70 0x236 0x3000c2>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ assigned-address = <0x50>;
+
+ cp0-ldo-microvolt = <1800000>;
+ cp1-ldo-microvolt = <1800000>;
+ tp0145-ldo-microvolt = <1800000>;
+ tp2367-ldo-microvolt = <1800000>;
+ tp0145-pullup-ohm = <1000>;
+ tp2367-pullup-ohm = <1000>;
+ cp0-io-strength-ohm = <50>;
+ cp1-io-strength-ohm = <50>;
+ tp0145-io-strength-ohm = <50>;
+ tp2367-io-strength-ohm = <50>;
+ cp0-supply = <&cp0>;
+ tp0145-supply = <&tp0145>;
+
+ regulators {
+ cp0 {
+ regulator-name = "cp0";
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ cp1 {
+ regulator-name = "cp1";
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ tp0145 {
+ regulator-name = "tp0145";
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ tp2367 {
+ regulator-name = "tp2367";
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <1800000>;
+ };
+ };
+
+ target-port at 0 {
+ reg = <0x0>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ mode = "smbus";
+ pullup-enable;
+
+ eeprom at 57 {
+ compatible = "atmel,24c32";
+ reg = <0x57>;
+ pagesize = <32>;
+ wp-gpios = <&gpio2 2 0>;
+ num-addresses = <8>;
+ };
+ };
+
+ target-port at 2 {
+ reg = <0x2>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ mode = "i3c";
+ pullup-enable;
+
+ sensor at 68,39200144004 {
+ reg = <0x68 0x392 0x144004>;
+ assigned-address = <0xa>;
+ };
+ };
+ };
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 4262e8d833c4..b33e90030188 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15477,6 +15477,14 @@ S: Maintained
F: Documentation/devicetree/bindings/sound/nxp,tfa989x.yaml
F: sound/soc/codecs/tfa989x.c
+NXP P3H2X4X I3C-HUB DRIVER
+M: Vikash Bansal <vikash.bansal at nxp.com>
+M: Aman Kumar Pandey <aman.kumarpandey at nxp.com>
+L: linux-kernel at vger.kernel.org
+L: linux-i3c-owner at lists.infradead.org
+S: Maintained
+F: Documentation/devicetree/bindings/i3c/p3h2x4x_i3c_hub.yaml
+
NZXT-KRAKEN2 HARDWARE MONITORING DRIVER
M: Jonas Malaco <jonas at protocubo.io>
L: linux-hwmon at vger.kernel.org
--
2.25.1
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