1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 2004 M. Warner Losh. 4.\" 5.\" All rights reserved. 6.\" 7.\" This program is free software. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd April 8, 2018 32.Dt BUS_ADD_CHILD 9 33.Os 34.Sh NAME 35.Nm BUS_ADD_CHILD 36.Nd "add a device node to the tree with a given priority" 37.Sh SYNOPSIS 38.In sys/param.h 39.In sys/bus.h 40.Ft device_t 41.Fn BUS_ADD_CHILD "device_t dev" "int order" "const char *name" "int unit" 42.Sh DESCRIPTION 43The 44.Fn BUS_ADD_CHILD 45method 46is used by the driver identify routine to add devices to the tree. 47It can also be used to add children to buses that implement this 48routine in other contexts, although the behavior is bus specific. 49Please see 50.Xr device_add_child 9 51for more details. 52The interface is the same as 53.Xr device_add_child 9 54however, the bus' 55.Fn BUS_ADD_CHILD 56is called. 57.Pp 58Buses implementing 59.Fn BUS_ADD_CHILD 60should insert the device into the tree using 61.Xr device_add_child 9 62before adding things such as their own ivars and resource lists to the device. 63.Fn BUS_ADD_CHILD 64is not called by 65.Xr device_add_child 9 . 66.Fn BUS_ADD_CHILD 67instead calls 68.Xr device_add_child 9 . 69.Pp 70A panic will result when called for a bus that does not implement 71.Fn BUS_ADD_CHILD . 72Some buses require a special bus-specific routine to be called instead 73of 74.Fn BUS_ADD_CHILD . 75.Sh RETURN VALUES 76The 77.Fn BUS_ADD_CHILD 78method returns 79.Vt device_t 80added to the tree, or 81.Dv NULL 82to indicate failure. 83.Sh SEE ALSO 84.Xr device 9 , 85.Xr device_add_child 9 , 86.Xr driver 9 87.Sh AUTHORS 88This manual page was written by 89.An M. Warner Losh . 90