[src/trunk]: src/share/man/man9 Give a heads up about bus_dmatag_subregion()

[sevan <sevan%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1dcb779b9df2
branches:  trunk
changeset: 820158:1dcb779b9df2
user:      sevan <sevan%NetBSD.org@localhost>
date:      Mon Jan 02 03:12:49 2017 +0000

description:
Give a heads up about bus_dmatag_subregion()

diffstat:

 share/man/man9/bus_dma.9 |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r 38fe09adbea6 -r 1dcb779b9df2 share/man/man9/bus_dma.9
--- a/share/man/man9/bus_dma.9  Mon Jan 02 02:38:54 2017 +0000
+++ b/share/man/man9/bus_dma.9  Mon Jan 02 03:12:49 2017 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: bus_dma.9,v 1.61 2016/06/01 08:17:47 wiz Exp $
+.\" $NetBSD: bus_dma.9,v 1.62 2017/01/02 03:12:49 sevan Exp $
 .\"
 .\" Copyright (c) 1996, 1997, 1998, 2001, 2005, 2006 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -28,7 +28,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd June 1, 2016
+.Dd January 2, 2017
 .Dt BUS_DMA 9
 .Os
 .Sh NAME
@@ -798,6 +798,8 @@
 create a new bus_dma_tag_t with a limited bus address space.
 This function should not normally be used, but is useful for devices
 that do not support the full address space of the parent bus.
+Not all ports implement this method; on ports where it is unavailable,
+EOPNOTSUPP is returned.
 The arguments are as follows:
 .Bl -tag -width max_addr -compact
 .It Fa tag