net: ibm: emac: support RGMII-[RX|TX]ID phymode
The RGMII spec allows compliance for devices that implement an internal delay on TXC and/or RXC inside the transmitter. This patch adds the necessary RGMII_[RX|TX]ID mode code to handle such PHYs with the emac driver. Signed-off-by: NChristian Lamparter <chunkeey@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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