net: mediatek: add support for SGMII 1Gbps auto-negotiation mode

Existing SGMII support of mtk-eth is actually a MediaTek-specific
2.5Gbps high-speed SGMII (HSGMII) which does not support
auto-negotiation mode.

This patch adds SGMII 1Gbps auto-negotiation mode and rename the
existing HSGMII to 2500basex.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2 files changed