@alwayscurious @sima PCI devices, at the bus/slot/function level do not have device nodes, so I don't understand the issue here.

They might have a specific PCI driver bound to them, at the function level, and if so, the parent of the device node for that class device (i.e. input, tty, drm, etc.) will then point to that PCI function. But PCI slots don't always match up to PCI bus and device numbers either, as that's a physical thing and many PCI systems don't expose or even know that information (i.e. the BIOS doesn't know.)

Also, PCI bus numbers can change at boot, so you can't know what is happening.

Driver probing can be deferred at any time by userspace for USB devices, and I think that was recently added for PCI devices too, look for the "trusted" device information in the documentation somewhere.

Good luck!