diff options
Diffstat (limited to 'share/man/man9/device_add_child.9')
| -rw-r--r-- | share/man/man9/device_add_child.9 | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/share/man/man9/device_add_child.9 b/share/man/man9/device_add_child.9 index 7ddd19a..052db92 100644 --- a/share/man/man9/device_add_child.9 +++ b/share/man/man9/device_add_child.9 @@ -28,7 +28,7 @@ .\" .\" $FreeBSD$ .\" -.Dd September 12, 2006 +.Dd October 28, 2015 .Dt DEVICE_ADD_CHILD 9 .Os .Sh NAME @@ -74,14 +74,14 @@ Normally unit numbers will be chosen automatically by the system and a unit number of .Dv -1 should be given. -When a specific unit number is desired (e.g.\& for wiring a particular +When a specific unit number is desired (e.g.,\& for wiring a particular piece of hardware to a pre-configured unit number), that unit should be passed. If the specified unit number is already allocated, a new unit will be allocated and a diagnostic message printed. .Pp If the devices attached to a bus must be probed in a specific order -(e.g.\& for the ISA bus some devices are sensitive to failed probe attempts +(e.g.,\& for the ISA bus some devices are sensitive to failed probe attempts of unrelated drivers and therefore must be probed first), the .Fa order @@ -109,10 +109,18 @@ Authors of bus drivers must likewise be careful when adding children when they are loaded and unloaded to avoid duplication of children devices. .Pp -Identify routines should use +When adding a child to another device node, such as in an identify +routine, use .Xr BUS_ADD_CHILD 9 instead of .Xr device_add_child 9 . +.Xr BUS_ADD_CHILD 9 +will call +.Xr device_add_child 9 +and add the proper bus-specific data to the new child. +.Fn device_add_child +does not call +.Xr BUS_ADD_CHILD 9 . .Sh RETURN VALUES The new device if successful, NULL otherwise. .Sh SEE ALSO |
