Merge branch 'BCM54612E'

Merge branch 'BCM54612E'

Xo Wang says:

====================
Broadcom BCM54612E support

This series is based on tip of torvalds/master.

The first patch adds register definitions from Broadcom docs.

The second patch adds the BCM54612E PHY ID, flags, and device-specific
RGMII internal delay initialization.

I tested on a custom board with an Aspeed AST2500 SOC with its second
MAC connected to this PHY.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>