dt-bindings: usb: Document the Microchip USB2514 hub

Document the Microchip USB2412, USB2417, and USB2514 USB hubs.

The existing usb251xb.yaml describes Microchip USB251x hubs that are
connected under I2C bus. Here, the hub is under the USB bus and use
the on-board-hub interface instead.

Signed-off-by: Fabio Estevam <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/devicetree/bindings/usb/microchip,usb2514.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/microchip,usb2514.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip USB2514 Hub Controller
+
+maintainers:
+  - Fabio Estevam <[e-mail]>
+
+allOf:
+  - $ref: usb-hcd.yaml#
+
+properties:
+  compatible:
+    enum:
+      - usb424,2412
+      - usb424,2417
+      - usb424,2514
+
+  reg: true
+
+  reset-gpios:
+    description: GPIO connected to the RESET_N pin.
+
+  vdd-supply:
+    description: 3.3V power supply.
+
+  clocks:
+    description: External 24MHz clock connected to the CLKIN pin.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx6qdl-clock.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    usb {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        usb-hub@1 {
+            compatible = "usb424,2514";
+            reg = <1>;
+            clocks = <&clks IMX6QDL_CLK_CKO>;
+            reset-gpios = <&gpio7 12 GPIO_ACTIVE_LOW>;
+            vdd-supply = <&reg_3v3_hub>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            ethernet@1 {
+                compatible = "usbb95,772b";
+                reg = <1>;
+            };
+        };
+    };