dt-bindings: usb: Convert generic USB properties to DT schemas

The generic USB properties have been described in the legacy bindings
text file: Documentation/devicetree/bindings/usb/generic.txt . Let's
convert its content into the generic USB, USB HCD and USB DRD DT
schemas. So the Generic USB schema will be applicable to all USB
controllers, USB HCD - for the generic USB Host controllers and the USB
DRD - for the USB Dual-role controllers.

Note the USB DRD schema is supposed to work in conjunction with
the USB peripheral/gadget and USB host controllers DT schemas.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20201210090944.16283-3-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/usb-drd.yaml

@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/usb-drd.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic USB OTG Controller Device Tree Bindings
+
+maintainers:
+  - Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+properties:
+  otg-rev:
+    description:
+      Tells usb driver the release number of the OTG and EH supplement with
+      which the device and its descriptors are compliant, in binary-coded
+      decimal (i.e. 2.0 is 0200H). This property is used if any real OTG
+      features (HNP/SRP/ADP) is enabled. If ADP is required, otg-rev should be
+      0x0200 or above.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  dr_mode:
+    description:
+      Tells Dual-Role USB controllers that we want to work on a particular
+      mode. In case this attribute isn't passed via DT, USB DRD controllers
+      should default to OTG.
+    $ref: /schemas/types.yaml#/definitions/string
+    enum: [host, peripheral, otg]
+
+  hnp-disable:
+    description:
+      Tells OTG controllers we want to disable OTG HNP. Normally HNP is the
+      basic function of real OTG except you want it to be a srp-capable only B
+      device.
+    type: boolean
+
+  srp-disable:
+    description:
+      Tells OTG controllers we want to disable OTG SRP. SRP is optional for OTG
+      device.
+    type: boolean
+
+  adp-disable:
+    description:
+      Tells OTG controllers we want to disable OTG ADP. ADP is optional for OTG
+      device.
+    type: boolean
+
+  usb-role-switch:
+    description:
+      Indicates that the device is capable of assigning the USB data role
+      (USB host or USB device) for a given USB connector, such as Type-C,
+      Type-B(micro). See connector/usb-connector.yaml.
+
+  role-switch-default-mode:
+    description:
+      Indicates if usb-role-switch is enabled, the device default operation
+      mode of controller while usb role is USB_ROLE_NONE.
+    $ref: /schemas/types.yaml#/definitions/string
+    enum: [host, peripheral]
+    default: peripheral
+
+additionalProperties: true
+
+examples:
+  - |
+    usb@4a030000 {
+        compatible = "snps,dwc3";
+        reg = <0x4a030000 0xcfff>;
+        interrupts = <0 92 4>;
+        usb-phy = <&usb2_phy>, <&usb3_phy>;
+        maximum-speed = "super-speed";
+        dr_mode = "otg";
+        phy_type = "utmi_wide";
+        otg-rev = <0x0200>;
+        adp-disable;
+    };