Hi Andrew,

The extra node for mdio seems to complicate things somewhat. 
Just adding this node seems not enough.  How to find out easily if a child 
of a enetc port node is a mdio node?

You copy somebody else code :-)

https://elixir.bootlin.com/linux/v5.0-rc6/source/drivers/net/dsa/mv88e6xxx/chip.c#L2765

	Andrew

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