tree d304258f6d37948848d165e4087292346fbe8211
parent 3cfef195212976032ce7bcd6b4d0b9f1e4741725
author Florian Fainelli <f.fainelli@gmail.com> 1461885852 -0700
committer David S. Miller <davem@davemloft.net> 1462145669 -0400

of: of_mdio: Check if MDIO bus controller is available

Add a check whether the 'struct device_node' pointer passed to
of_mdiobus_register() is an available (aka enabled) node in the Device
Tree.

Rationale for doing this are cases where an Ethernet MAC provides a MDIO
bus controller and node, and an additional Ethernet MAC might be
connecting its PHY/switches to that first MDIO bus controller, while
still embedding one internally which is therefore marked as "disabled".

Instead of sprinkling checks like these in callers of
of_mdiobus_register(), do this in a central location.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>