On Fri, Mar 19, 2021 at 04:56PM +0800, Russell King - ARM Linux admin wrote: > On Fri, Mar 19, 2021 at 08:40:45AM +0100, Heiner Kallweit wrote: >> Is there a specific reason why c22 is probed first? Reversing the order >> would solve the issue we speak about here. >> c45-probing of c22-only PHY's shouldn't return false positives >> (at least at a first glance). > > That would likely cause problems for the I2f MDIO driver, since a > C45 read is indistinguishable from a C22 write on the I2C bus. > Hi Russell, STMMAC is capable of supporting external PHYs that accessible using C22 or C45. Accordng to patch [1] send earlier, it should solve the problem. As for any other drivers, if it is not using MDIOBUS_C45_C22, It should still work as it is by using MDIOBUS_C22. [1] https://lkml.org/lkml/2020/11/9/443 > -- > RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ > FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
