dt-bindings: phy: Add Sophgo CV1800 USB phy

The USB phy of Sophgo CV18XX series SoC needs to sense a pin called
"VBUS_DET" to get the right operation mode. If this pin is not
connected, it only supports setting the mode manually.

Add USB phy bindings for Sophgo CV18XX/SG200X series SoC.

Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250708063038.497473-2-inochiama@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: inochisa

Documentation/devicetree/bindings/phy/sophgo,cv1800b-usb2-phy.yaml

@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/sophgo,cv1800b-usb2-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo CV18XX/SG200X USB 2.0 PHY
+
+maintainers:
+  - Inochi Amaoto <inochiama@gmail.com>
+
+properties:
+  compatible:
+    const: sophgo,cv1800b-usb2-phy
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 0
+
+  clocks:
+    items:
+      - description: PHY app clock
+      - description: PHY stb clock
+      - description: PHY lpm clock
+
+  clock-names:
+    items:
+      - const: app
+      - const: stb
+      - const: lpm
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - "#phy-cells"
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    phy@48 {
+      compatible = "sophgo,cv1800b-usb2-phy";
+      reg = <0x48 0x4>;
+      #phy-cells = <0>;
+      clocks = <&clk 93>, <&clk 94>, <&clk 95>;
+      clock-names = "app", "stb", "lpm";
+      resets = <&rst 58>;
+    };