dt-bindings: phy: Add Canaan K230 USB PHY

K230 SoC USB PHY requires configuring registers for control and
configuration. Add USB phy bindings for K230 SoC.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Jiayu Du <jiayu.riscv@isrc.iscas.ac.cn>
Link: https://patch.msgid.link/20260121145526.14672-2-jiayu.riscv@isrc.iscas.ac.cn
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/canaan,k230-usb-phy.yaml

@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/canaan,k230-usb-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Canaan K230 USB2.0 PHY
+
+maintainers:
+  - Jiayu Du <jiayu.riscv@isrc.iscas.ac.cn>
+
+properties:
+  compatible:
+    const: canaan,k230-usb-phy
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    usbphy: usb-phy@91585000 {
+        compatible = "canaan,k230-usb-phy";
+        reg = <0x91585000 0x400>;
+        #phy-cells = <1>;
+    };