device_add — add device to device hierarchy.
| int device_add ( | struct device * dev ); | 
   This is part 2 of device_register, though may be called
   separately _iff_ device_initialize has been called separately.
   
   This adds dev to the kobject hierarchy via kobject_add, adds it
   to the global and sibling lists for the device, then
   adds it to the other relevant subsystems of the driver model.
   
   Do not call this routine or device_register more than once for
   any device structure.  The driver model core is not designed to work
   with devices that get unregistered and then spring back to life.
   (Among other things, it's very hard to guarantee that all references
   to the previous incarnation of dev have been dropped.)  Allocate
   and register a fresh new struct device instead.