NAME

     BUS_ADD_CHILD — add a device node to the tree with a given priority

SYNOPSIS

     #include <sys/param.h>
     #include <sys/bus.h>

     device_t
     BUS_ADD_CHILD(device_t dev, int order, const char *name, int unit);

DESCRIPTION

     The BUS_ADD_CHILD() method is used by the driver identify routine to add devices to the
     tree.  It can also be used to add children to buses that implement this routine in other
     contexts, although the behavior is bus specific.  Please see device_add_child(9) for more
     details.  The interface is the same as device_add_child(9) however, the bus' BUS_ADD_CHILD()
     is called.

     Buses implementing BUS_ADD_CHILD() should insert the device into the tree using
     device_add_child(9) before adding things such as their own ivars and resource lists to the
     device.  BUS_ADD_CHILD() is not called by device_add_child(9).  BUS_ADD_CHILD() instead
     calls device_add_child(9).

     A panic will result when called for a bus that does not implement BUS_ADD_CHILD().  Some
     buses require a special bus-specific routine to be called instead of BUS_ADD_CHILD().

RETURN VALUES

     The BUS_ADD_CHILD() method returns device_t added to the tree, or NULL to indicate failure.

SEE ALSO

     device(9), device_add_child(9), driver(9)

AUTHORS

     This manual page was written by M. Warner Losh.