dt-bindings: usb: Add Socionext Uniphier DWC3 controller

The Socionext Uniphier DWC3 controller binding is already in use, but undocumented. It's a straight-forward binding similar to other DWC3 bindings.

Signed-off-by Rob Herring (Arm) <[email protected]>

---
v2:
- Allow 1 phy entry for Pro4

---
  .../bindings/usb/socionext,uniphier-dwc3.yaml | 89 +++++++++++++++++++
  1 file changed, 89 insertions(+)

create mode 100644
Documentation/devicetree/bindings/usb/socionext,uniphier-dwc3.yaml

diff --git a/Documentation/devicetree/bindings/usb/socionext,uniphier-dwc3.yaml b/Documentation/devicetree/bindings/usb/socionext,uniphier-dwc3.yaml new file mode 100644
index 000000000000..2b253339c199

Documentation/devicetree/bindings/usb/socionext,uniphier-dwc3.yaml new file +79 -0

@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/socionext,uniphier-dwc3.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Socionext Uniphier SuperSpeed DWC3 USB SoC controller
+
+maintainers:
+  - Kunihiko Hayashi <[email protected]>
+  - Masami Hiramatsu <[email protected]>
+
+select:
+  properties:
+    compatible:
+      contains:
+        const: socionext,uniphier-dwc3
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - const: socionext,uniphier-dwc3
+      - const: snps,dwc3
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 1
+    items:
+      - description: Host or single combined interrupt
+      - description: Peripheral interrupt
+
+  interrupt-names:
+    minItems: 1
+    items:
+      - enum:
+          - dwc_usb3
+          - host
+      - const: peripheral
+
+  clocks:
+    maxItems: 3
+
+  clock-names:
+    items:
+      - const: ref
+      - const: bus_early
+      - const: suspend
+
+  phys:
+    description: 1 to 4 HighSpeed PHYs followed by 1 or 2 SuperSpeed PHYs
+    minItems: 1
+    maxItems: 6
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - phys
+
+unevaluatedProperties: false
+
+allOf:
+  - $ref: snps,dwc3.yaml#
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    usb@65a00000 {
+        compatible = "socionext,uniphier-dwc3", "snps,dwc3";