WIP: device tree MVP

dts/bindings/phy/phy-controller.yaml

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+# Copyright (c) 2018, Yannis Damigos
+# SPDX-License-Identifier: Apache-2.0
+
+# Common fields for PHY providers
+
+include: base.yaml
+
+properties:
+    "#phy-cells":
+        type: int
+        required: true
+        description: |
+          Number of cells in a PHY provider. The meaning those
+          cells is defined by the binding for the phy node.

dts/bindings/phy/st,stm32-usbphyc.yaml

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+# Copyright (c) 2018, Yannis Damigos
+# SPDX-License-Identifier: Apache-2.0
+
+description: STM32 USB HS PHY controller
+
+compatible: "st,stm32-usbphyc"
+
+include: phy-controller.yaml
+
+properties:
+    reg:
+      required: true
+
+    "#phy-cells":
+      const: 0

dts/bindings/phy/usb-nop-xceiv.yaml

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+# Copyright (c) 2018, Yannis Damigos
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+    This binding is to be used by all the usb transceivers which are built-in
+    with USB IP
+
+compatible: "usb-nop-xceiv"
+
+include: phy-controller.yaml
+
+properties:
+    "#phy-cells":
+      const: 0