[PATCH v9 3/7] dt-bindings: i3c: Add NXP P3H2x4x i3c-hub support

[Lakshay Piplani <lakshay.piplani@nxp.com>]

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>
Signed-off-by: Lakshay Piplani <lakshay.piplani@nxp.com>

---
Changes in v9:
 - Referenced i3c.yaml and i2c-controller.yaml for child nodes
 - Dropped unnecessary #address-cells and #size-cells from child nodes

Changes in v8:
 - Add compatible in i3c example

Changes in v7:
 - Fix schema validation issues
 - Adjust required properties
 - Add I2C example

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  | 291 ++++++++++++++++++
 MAINTAINERS                                   |   9 +
 2 files changed, 300 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..c080eeb0eeaa
--- /dev/null
+++ b/Documentation/devicetree/bindings/i3c/nxp,p3h2840.yaml
@@ -0,0 +1,291 @@
+# 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>
+  - Lakshay Piplani <lakshay.piplani@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.
+
+properties:
+  compatible:
+    const: nxp,p3h2840
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  assigned-address:
+    maximum: 0x7f
+
+  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
+        $ref: /schemas/regulator/regulator.yaml#
+        unevaluatedProperties: false
+
+required:
+  - reg
+
+patternProperties:
+  "^i3c@[0-7]$":
+    type: object
+    $ref: /schemas/i3c/i3c.yaml#
+    unevaluatedProperties: false
+
+    properties:
+      reg:
+        description:
+          The I3C HUB Target Port number.
+        maximum: 7
+
+      nxp,pullup-enable:
+        type: boolean
+        description:
+          Enables the on-die pull-up for Target Port.
+
+    required:
+      - reg
+
+  "^(i2c|smbus)@[0-7]$":
+    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.
+
+    required:
+      - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i3c {
+        #address-cells = <3>;
+        #size-cells = <0>;
+
+        hub@70,236153000c2 {
+            reg = <0x70 0x236 0x3000c2>;
+            compatible = "nxp,p3h2840";
+            #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 = <&reg_tpg0>;
+            vcc4-supply = <&reg_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;
+            };
+        };
+    };
+
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        hub@70 {
+            reg = <0x70>;
+            compatible = "nxp,p3h2840";
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            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 = <&reg_tpg0_i2c>;
+            vcc4-supply = <&reg_tpg1_i2c>;
+
+            regulators {
+                reg_cp0_i2c: ldo-cp0 {
+                    regulator-name = "ldo-cp0";
+                    regulator-min-microvolt = <1800000>;
+                    regulator-max-microvolt = <1800000>;
+                };
+
+                reg_cp1_i2c: ldo-cp1 {
+                    regulator-name = "ldo-cp1";
+                    regulator-min-microvolt = <1800000>;
+                    regulator-max-microvolt = <1800000>;
+                };
+
+                reg_tpg0_i2c: ldo-tpg0 {
+                    regulator-name = "ldo-tpg0";
+                    regulator-min-microvolt = <1800000>;
+                    regulator-max-microvolt = <1800000>;
+                };
+
+                reg_tpg1_i2c: 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;
+            };
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 76d8291237be..4425816b478b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19266,6 +19266,15 @@ 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>
+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
+
 NXP PF5300/PF5301/PF5302 PMIC REGULATOR DEVICE DRIVER
 M:	Woodrow Douglass <wdouglass@carnegierobotics.com>
 S:	Maintained
-- 
2.25.1


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