Re: [PATCHv3 1/3] dt-bindings: net: Add DT bindings for Socionext Netsec

On 12/21/2017 05:55 AM, Andrew Lunn wrote:

quoted

+- mdio device tree subnode: When the Netsec has a phy connected to its local
+		mdio, there must be device tree subnode with the following
+		required properties:
+
+	- compatible: Must be "socionext,snq-mdio".

Is there a need for a compatible string? Is there different versions
of the MDIO bus hardware? If it was an independent MDIO bus driver,
then yes, you need a compatible string. But since it is embedded in
the MAC driver, there should not be a need.

I don't see a problem with doing that though, it may be extra
information, but if we ever have a standalone MDIO bus controller that
happens to be supported by the same HW/driver, and the Ethernet driver
delegates the MDIO management to this MDIO bus driver, then having the
compatible string is kind of mandatory for proper matching/identification.
-- 
Florian
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