dt-bindings: phy: Convert marvell,mmp2-usb-phy to DT schema

Convert the Marvell MMP2 USB PHY binding to DT schema format. It's a
straight forward conversion.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250607212613.743515-1-robh@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/marvell,mmp2-usb-phy.yaml

@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/marvell,mmp2-usb-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell MMP2/PXA USB PHY
+
+maintainers:
+  - Lubomir Rintel <lkundrak@v3.sk>
+
+properties:
+  compatible:
+    enum:
+      - marvell,mmp2-usb-phy
+      - marvell,pxa910-usb-phy
+      - marvell,pxa168-usb-phy
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    usbphy@d4207000 {
+        compatible = "marvell,mmp2-usb-phy";
+        reg = <0xd4207000 0x40>;
+        #phy-cells = <0>;
+        status = "okay";
+    };

Documentation/devicetree/bindings/phy/phy-pxa-usb.txt

@@ -1,18 +0,0 @@
-Marvell PXA USB PHY
--------------------
-
-Required properties:
-- compatible: one of: "marvell,mmp2-usb-phy", "marvell,pxa910-usb-phy",
-	"marvell,pxa168-usb-phy",
-- #phy-cells: must be 0
-
-Example:
-	usb-phy: usbphy@d4207000 {
-		compatible = "marvell,mmp2-usb-phy";
-		reg = <0xd4207000 0x40>;
-		#phy-cells = <0>;
-		status = "okay";
-	};
-
-This document explains the device tree binding. For general
-information about PHY subsystem refer to Documentation/driver-api/phy/phy.rst