1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 2004 M. Warner Losh <imp@FreeBSD.org> 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 15.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 18.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24.\" 25.Dd April 8, 2018 26.Dt BUS_ADD_CHILD 9 27.Os 28.Sh NAME 29.Nm BUS_ADD_CHILD 30.Nd "add a device node to the tree with a given priority" 31.Sh SYNOPSIS 32.In sys/param.h 33.In sys/bus.h 34.Ft device_t 35.Fn BUS_ADD_CHILD "device_t dev" "int order" "const char *name" "int unit" 36.Sh DESCRIPTION 37The 38.Fn BUS_ADD_CHILD 39method 40is used by the driver identify routine to add devices to the tree. 41It can also be used to add children to buses that implement this 42routine in other contexts, although the behavior is bus specific. 43Please see 44.Xr device_add_child 9 45for more details. 46The interface is the same as 47.Xr device_add_child 9 48however, the bus' 49.Fn BUS_ADD_CHILD 50is called. 51.Pp 52Buses implementing 53.Fn BUS_ADD_CHILD 54should insert the device into the tree using 55.Xr device_add_child 9 56before adding things such as their own ivars and resource lists to the device. 57.Fn BUS_ADD_CHILD 58is not called by 59.Xr device_add_child 9 . 60.Fn BUS_ADD_CHILD 61instead calls 62.Xr device_add_child 9 . 63.Pp 64A panic will result when called for a bus that does not implement 65.Fn BUS_ADD_CHILD . 66Some buses require a special bus-specific routine to be called instead 67of 68.Fn BUS_ADD_CHILD . 69.Sh RETURN VALUES 70The 71.Fn BUS_ADD_CHILD 72method returns 73.Vt device_t 74added to the tree, or 75.Dv NULL 76to indicate failure. 77.Sh SEE ALSO 78.Xr device 9 , 79.Xr device_add_child 9 , 80.Xr driver 9 81.Sh AUTHORS 82This manual page was written by 83.An M. Warner Losh . 84