On Fri, Sep 04, 2020 at 04:00:55PM +0200, Adam Rudziński wrote: > W dniu 2020-09-04 o 15:45, Andrew Lunn pisze: > > > Just a bunch of questions. > > > > > > Actually, why is it necessary to have a full MDIO bus scan already during > > > probing peripherals? > > That is the Linux bus model. It does not matter what sort of bus it > > is, PCI, USB, MDIO, etc. When the bus driver is loaded, the bus is > > enumerated and drivers probe for each device found on the bus. > > OK. But is it always expected to find all the devices on the bus in the > first run? Yes. Cold plug expects to find all the device while scanning the bus. > Does the bus model ever allow to just add any more devices? Kind of, > "hotplug". :) Hotplug is triggered by hardware saying a new device has been added/removed after cold plug. This is not a hotplug case. The hardware has not suddenly appeared, it has always been there. Andrew
