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? Does the bus model ever allow to just add any more devices?
Kind of, "hotplug". :)
I'd say that it is not necessary to have a PHY getting found before it is
needed to setup the complete interface.
It is like saying, we don't need to probe the keyboard until the first
time the "Press Enter" prompt is given?
I'm not sure what you mean. It's like saying that we don't need to care
if we even have the keyboard until we are interested in any interaction
with it. (This might be reading a key, an autotest, ..., or not using,
but avoiding a conflict - depends on application.)
Best regards,
Adam
