+  nvmem-cells:
+    items:
+      - description: nvmem cell address of MAC address of 1st MAC
+      - description: nvmem cell address of MAC address of 2nd MAC
+
+  nvmem-cell-names:
+    description: names corresponding to the nvmem cells of MAC address
+    items:
+      - const: mac_addr0
+      - const: mac_addr1

These are port properties, so put them in the port section.

Also, the name you should use is well defined, "mac-address".  See
nvmem_get_mac_address(). But you won't be able to use that helper
because it take dev, not an of node.

	Andrew