Nathan Whitehorn 629aa519d6 Make tsec work with the device tree present on the RB800. The previous code
assumed that the MDIO bus was a direct child of the Ethernet interface. It
may not be and indeed on many device trees is not. While here, add proper
locking for MII transactions, which may be on a bus shared by several MACs.

Hardware donated by:	Benjamin Perrault
2013-11-11 15:43:21 +00:00
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