[man] Add documentation for OpenFirmware API
Add man pages for following OpenFirmware functions:
OF_child, OF_parent, OF_peer, OF_device_from_xref,
OF_device_register_xref, OF_xref_from_device, OF_getprop,
OF_getencprop, OF_getencprop_alloc, OF_getprop_alloc, OF_getproplen,
OF_hasprop, OF_nextprop, OF_prop_free, OF_searchencprop,
OF_searchprop, OF_setprop
Edited by: wblock
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D14511
2018-04-09 22:23:45 +00:00
|
|
|
.\"
|
|
|
|
.\" Copyright (c) 2018 Oleksandr Tymoshenko <gonzo@FreeBSD.org>
|
|
|
|
.\"
|
|
|
|
.\" All rights reserved.
|
|
|
|
.\"
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
.\" are met:
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
.\"
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
|
|
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
|
|
.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
|
|
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
|
|
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
|
|
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
.\"
|
|
|
|
.\" $FreeBSD$
|
|
|
|
.\"
|
|
|
|
.Dd April 9, 2018
|
|
|
|
.Dt OF_FINDDEVICE 9
|
|
|
|
.Os
|
|
|
|
.Sh NAME
|
|
|
|
.Nm OF_finddevice
|
|
|
|
.Nd find node in device tree
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
.In dev/ofw/ofw_bus.h
|
|
|
|
.In dev/ofw/ofw_bus_subr.h
|
|
|
|
.Ft phandle_t
|
|
|
|
.Fn OF_finddevice "const char *path"
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
.Fn OF_finddevice
|
|
|
|
returns the phandle for the node specified by the
|
|
|
|
.Fa path .
|
|
|
|
Returns -1 if the path cannot be found in the tree.
|
|
|
|
.Sh EXAMPLES
|
|
|
|
.Bd -literal
|
|
|
|
phandle_t root, i2c;
|
|
|
|
|
|
|
|
root = OF_finddevice("/");
|
|
|
|
i2c = OF_finddevice("/soc/axi/i2c@a0e0000");
|
|
|
|
if (i2c != -1) {
|
|
|
|
...
|
|
|
|
}
|
|
|
|
.Ed
|
|
|
|
.Sh SEE ALSO
|
|
|
|
.Xr OF_child 9
|
|
|
|
.Xr OF_parent 9
|
|
|
|
.Xr OF_peer 9
|
|
|
|
.Sh AUTHORS
|
|
|
|
.An -nosplit
|
|
|
|
This manual page was written by
|
|
|
|
.An Oleksandr Tymoshenko Aq Mt gonzo@FreeBSD.org .
|
2020-10-09 19:12:44 +00:00
|
|
|
.Sh CAVEATS
|
|
|
|
The return value should only be checked with equality
|
|
|
|
operators (equal to, not equal to) and not relational comparison
|
|
|
|
(less than, greater than ).
|
|
|
|
There is a discrepancy between IEEE 1275 standard and
|
|
|
|
.Fx Ns 's
|
|
|
|
internal representation of a phandle: IEEE 1275
|
|
|
|
requires the return value of this function to be -1 if the path
|
|
|
|
is not found.
|
|
|
|
But phandle_t is an unsigned type, so it cannot
|
|
|
|
be relationally compared with -1 or 0, this comparison
|
|
|
|
is always true or always false.
|