noble (9) BUS_ADD_CHILD.9freebsd.gz

Provided by: freebsd-manpages_12.2-1_all bug

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.