Hi Chester, > Hi Andrew and Andreas, > > On Thu, Nov 03, 2022 at 11:05:30PM +0100, Andrew Lunn wrote: > > > > > + - description: Main GMAC clock > > > > > + - description: Peripheral registers clock > > > > > + - description: Transmit SGMII clock > > > > > + - description: Transmit RGMII clock > > > > > + - description: Transmit RMII clock > > > > > + - description: Transmit MII clock > > > > > + - description: Receive SGMII clock > > > > > + - description: Receive RGMII clock > > > > > + - description: Receive RMII clock > > > > > + - description: Receive MII clock > > > > > + - description: > > > > > + PTP reference clock. This clock is used for programming the > > > > > + Timestamp Addend Register. If not passed then the system > > > > > + clock will be used. > > > > > Not clear to me has been whether the PHY mode can be switched at > runtime > > > (like DPAA2 on Layerscape allows for SFPs) or whether this is fixed by > board > > > design. > > > > Does the hardware support 1000BaseX? Often the hardware implementing > > SGMII can also do 1000BaseX, since SGMII is an extended/hacked up > > 1000BaseX. > > > > If you have an SFP connected to the SERDES, a fibre module will want > > 1000BaseX and a copper module will want SGMII. phylink will tell you > > what phy-mode you need to use depending on what module is in the > > socket. This however might be a mute point, since both of these are > > probably using the SGMII clocks. > > > > Of the other MII modes listed, it is very unlikely a runtime swap will > > occur. > > > > Andrew > > Here I just focus on GMAC since there are other LAN interfaces that S32 > family > uses [e.g. PFE]. According to the public GMACSUBSYS ref manual rev2[1] > provided > on NXP website, theoretically GMAC can run SGMII in 1000Mbps and > 2500Mbps so I > assume that supporting 1000BASE-X could be achievable. I'm not sure if any > S32 > board variant might have SFP ports but RJ-45 [1000BASE-T] should be the > major > type used on S32G-EVB and S32G-RDB2. > > @NXP, please feel free to correct me if anything wrong. > NXP eval boards (EVB or RDB) have also 2.5G PHYs, so together with SerDes driver we support 100M/1G/2.5G on such copper PHYs. /Jan -- NXP Czechia, AP Ethernet
