dt-bindings: usb: Convert ehci-mv to json-schema

A straightforward conversion of the ehci-mv binding to DT schema format
using json-schema.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
[robh: add unevaluatedProperties]
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/usb/ehci-mv.txt

-* Marvell PXA/MMP EHCI controller.
-
-Required properties:
-
-- compatible: must be "marvell,pxau2o-ehci"
-- reg: physical base addresses of the controller and length of memory mapped region
-- interrupts: one EHCI controller interrupt should be described here
-- clocks: phandle list of usb clocks
-- clock-names: should be "USBCLK"
-- phys: phandle for the PHY device
-- phy-names: should be "usb"
-
-Example:
-
-	ehci0: usb-ehci@d4208000 {
-		compatible = "marvell,pxau2o-ehci";
-		reg = <0xd4208000 0x200>;
-		interrupts = <44>;
-		clocks = <&soc_clocks MMP2_CLK_USB>;
-		clock-names = "USBCLK";
-		phys = <&usb_otg_phy>;
-		phy-names = "usb";
-	};

Documentation/devicetree/bindings/usb/marvell,pxau2o-ehci.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2019,2020 Lubomir Rintel <lkundrak@v3.sk>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/marvell,pxau2o-ehci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell PXA/MMP EHCI bindings
+
+maintainers:
+  - Lubomir Rintel <lkundrak@v3.sk>
+
+allOf:
+  - $ref: usb-hcd.yaml#
+
+properties:
+  compatible:
+    const: marvell,pxau2o-ehci
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: USBCLK
+
+  phys:
+    maxItems: 1
+
+  phy-names:
+    const: usb
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - phys
+  - phy-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/marvell,mmp2.h>
+    usb@d4208000 {
+        compatible = "marvell,pxau2o-ehci";
+        reg = <0xd4208000 0x200>;
+        interrupts = <44>;
+        clocks = <&soc_clocks MMP2_CLK_USB>;
+        clock-names = "USBCLK";
+        phys = <&usb_otg_phy>;
+        phy-names = "usb";
+    };
+
+...