dts: bindings: usb: Introduce STM32N6 OTG HS compatible

Add STM32N6 USB OTG HS compatible 'st,stm32n6-otghs'
that doesn't require pinctrl-0 and pinctrl-names.

Signed-off-by: IBEN EL HADJ MESSAOUD Marwa <marwa.ibenelhadjmessaoud-ext@st.com>

dts/bindings/usb/st,stm32-otghs-common.yaml

@@ -0,0 +1,27 @@
+# Copyright (c) 2025, STMicroelectronics
+# SPDX-License-Identifier: Apache-2.0
+
+# Common fields for STM32 OTGHS controller
+
+include: [usb-ep.yaml, pinctrl-device.yaml]
+
+properties:
+  reg:
+    required: true
+
+  interrupts:
+    required: true
+
+  ram-size:
+    type: int
+    required: true
+    description: |
+      Size of USB dedicated RAM. STM32 SOC's reference
+      manual defines a shared FIFO size.
+
+  phys:
+    type: phandle
+    description: PHY provider specifier
+
+  clocks:
+    required: true

dts/bindings/usb/st,stm32-otghs.yaml

@@ -1,35 +1,16 @@
 # Copyright (c) 2017, I-SENSE group of ICCS
+# Copyright (c) 2025, STMicroelectronics
 # SPDX-License-Identifier: Apache-2.0
 
 description: STM32 OTGHS controller
 
 compatible: "st,stm32-otghs"
 
-include: [usb-ep.yaml, pinctrl-device.yaml]
+include: st,stm32-otghs-common.yaml
 
 properties:
-  reg:
-    required: true
-
-  interrupts:
-    required: true
-
   pinctrl-0:
     required: true
 
   pinctrl-names:
     required: true
-
-  ram-size:
-    type: int
-    required: true
-    description: |
-      Size of USB dedicated RAM. STM32 SOC's reference
-      manual defines a shared FIFO size.
-
-  phys:
-    type: phandle
-    description: PHY provider specifier
-
-  clocks:
-    required: true

dts/bindings/usb/st,stm32n6-otghs.yaml

@@ -0,0 +1,13 @@
+# Copyright (c) 2025, STMicroelectronics
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+  STM32N6 OTGHS controller
+
+  In the STM32N6 series, the `pinctrl-0` and `pinctrl-names` properties are not required
+  for the USB OTG HS peripheral configuration. This is because the pin multiplexing
+  for the USB OTG HS peripheral are handled automatically by the hardware.
+
+compatible: "st,stm32n6-otghs"
+
+include: st,stm32-otghs-common.yaml