On Fri, Nov 24, 2023 at 03:44:20PM +0100, Andrew Lunn wrote: > > First Serdes mode Second Serdes mode > > Option 1 PSGMII for copper Disabled > > ports 0-4 > > Option 2 PSGMII for copper 1000BASE-X / 100BASE-FX > > ports 0-4 > > Option 3 QSGMII for copper SGMII for > > ports 0-3 copper port 4 > > With option 2, can the second SERDES also do SGMII? You are likely to > need that when a Copper SFP module is inserted into the cage. The document states "The fiber port supports 1000BASE-X/100BASE-FX". The same is true of Marvell 88x3310's fiber port - it supports only fiber not SGMII. This is actually something else that - when the patches for stacked PHYs mature - will need to be addressed. If we have a 1G copper SFP plugged into an interface that only supports 1000base-X then we need a way to switch the PHY on the SFP module to 1000base-X if it's in SGMII mode. Some copper SFPs come up in 1000base-X mode, and we currently rely on the 88e1111 driver to switch them to SGMII mode. Others do want SGMII mode (like Mikrotik RJ01 where the PHY is inaccessible and thus can't be reconfigured.) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
