dt-bindings: usb: add the Renesas RZ/N1 USBF controller

The Renesas RZ/N1 USBF controller is an USB2.0 device controller
(UDC) available in the Renesas r9a06g032 SoC (RZ/N1 family).
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230105152257.310642-2-herve.codina@bootlin.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/renesas,rzn1-usbf.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/renesas,rzn1-usbf.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/N1 SoCs USBF (USB Function) controller
+
+description: |
+   The Renesas USBF controller is an USB2.0 device
+   controller (UDC).
+
+maintainers:
+  - Herve Codina <herve.codina@bootlin.com>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,r9a06g032-usbf
+      - const: renesas,rzn1-usbf
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Internal bus clock (AHB) for Function
+      - description: Internal bus clock (AHB) for Power Management
+
+  clock-names:
+    items:
+      - const: hclkf
+      - const: hclkpm
+
+  power-domains:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: The USBF EPC interrupt
+      - description: The USBF AHB-EPC interrupt
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - power-domains
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/r9a06g032-sysctrl.h>
+
+    usb@4001e000 {
+        compatible = "renesas,r9a06g032-usbf", "renesas,rzn1-usbf";
+        reg = <0x4001e000 0x2000>;
+        interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&sysctrl R9A06G032_HCLK_USBF>,
+                 <&sysctrl R9A06G032_HCLK_USBPM>;
+        clock-names = "hclkf", "hclkpm";
+        power-domains = <&sysctrl>;
+    };