WIP: device tree MVP

dts/bindings/mdio/atmel,sam-mdio.yaml

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+# Copyright (c) 2021 IP-Logix Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Atmel SAM Family MDIO Driver node
+
+compatible: "atmel,sam-mdio"
+
+include: mdio-controller.yaml
+
+properties:
+    pinctrl-0:
+      type: phandles
+      required: false
+      description: |
+        PIO pin configuration for MDC, and MDIO signals.
+
+        For example the GMAC on SAME7x would be
+          pinctrl-0 = <&pd8a_gmac_gmdc &pd9a_gmac_gmdio>;

dts/bindings/mdio/mdio-controller.yaml

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+# Copyright (c) 2021 IP-Logix Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+# Common fields for MDIO controllers
+
+include: base.yaml
+
+bus: mdio
+
+properties:
+    label:
+      required: true
+    protocol:
+      required: false
+      type: string
+      description: |
+        MDIO bus framing protocol to use for communication. Most devices
+        support clause 22.
+
+        - clause 22: IEEE802.3 clause 22 frame format
+        - clause 45: IEEE802.3 clause 45 frame format
+        - micrel SMI: Micrel Serial Management Interface frame format
+      enum:
+        - "clause 22"
+        - "clause 45"
+        - "micrel SMI"
+      default: "clause 22"