On Aug 27, 2007, at 06:12, DI BACCO ANTONIO - technolabs wrote: > Hi, > > I have an hot pluggable MDIO bus (connected to MDC, MDIO of an > MPC880) and thus I would like to rescan the bus on certain events > (for example fs_enet_open) to access the numerous PHYs I have on > this bus. I saw that it is "simply" a matter of calling > mdiobus_register but I would like an advice how to design the > modification
There are a few problems, here: 1) Do you expect only to add/remove PHYs, or to completely swap out the entire set? 2) If you bring up one interface, swap out the PHYs, and then bring up a second interface, the first one will be broken I think the best solution is to add the capability for the PHY Lib to tell attached ethernet controllers that the PHY has been disconnected/ deallocated. Perhaps protected by a CONFIG_ option. Then you would add support for taking down a PHY, and probably the whole bus, on the fly. This would require making sure that all outstanding transactions are done, and may be as simple as invoking mdiobus_unregister. The tricky part is that we really need to have some way to tell the ethernet controllers that were up that the new bus is there. If we're really fancy, the PHY Lib could even hook those controllers up automatically, but it may be necessary for the drivers to change which address they connect to. Andy _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
