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>
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