only the port id, but also so-called "extensions". The only documented
extension so-far in the specification is the inclusion of timestamps, for
PTP-enabled PHYs. This mode isn't compatible with QSGMII, but offers the
- same capabilities in terms of link speed and negociation.
+ same capabilities in terms of link speed and negotiation.
``PHY_INTERFACE_MODE_1000BASEKX``
This is 1000BASE-X as defined by IEEE 802.3 Clause 36 with Clause 73