[src/trunk]: src/sys/dev/usb Add a comment about a non-obvious use of a #define.

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

details:   https://anonhg.NetBSD.org/src/rev/a3bc1f912476
branches:  trunk
changeset: 485171:a3bc1f912476
user:      augustss <augustss%NetBSD.org@localhost>
date:      Fri Apr 21 15:38:55 2000 +0000

description:
Add a comment about a non-obvious use of a #define.

diffstat:

 sys/dev/usb/ohci.c |  3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diffs (17 lines):

diff -r 99e50d2a9375 -r a3bc1f912476 sys/dev/usb/ohci.c
--- a/sys/dev/usb/ohci.c        Fri Apr 21 15:37:50 2000 +0000
+++ b/sys/dev/usb/ohci.c        Fri Apr 21 15:38:55 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ohci.c,v 1.85 2000/04/01 09:27:35 augustss Exp $       */
+/*     $NetBSD: ohci.c,v 1.86 2000/04/21 15:38:55 augustss Exp $       */
 /*     $FreeBSD: src/sys/dev/usb/ohci.c,v 1.22 1999/11/17 22:33:40 n_hibma Exp $       */
 
 /*
@@ -2352,6 +2352,7 @@
                        OWRITE4(sc, port, UPS_OVERCURRENT_INDICATOR);
                        break;
                case UHF_PORT_POWER:
+                       /* Yes, writing to the LOW_SPEED bit clears power. */
                        OWRITE4(sc, port, UPS_LOW_SPEED);
                        break;
                case UHF_C_PORT_CONNECTION: