[src/trunk]: src/sys/dev/ic Add more comments

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

details:   https://anonhg.NetBSD.org/src/rev/77ab42f5fcef
branches:  trunk
changeset: 333102:77ab42f5fcef
user:      martin <martin%NetBSD.org@localhost>
date:      Sun Oct 19 11:37:17 2014 +0000

description:
Add more comments

diffstat:

 sys/dev/ic/dwc_gmac_reg.h |  17 ++++++++++-------
 1 files changed, 10 insertions(+), 7 deletions(-)

diffs (27 lines):

diff -r 9ae80fedae71 -r 77ab42f5fcef sys/dev/ic/dwc_gmac_reg.h
--- a/sys/dev/ic/dwc_gmac_reg.h Sun Oct 19 11:17:43 2014 +0000
+++ b/sys/dev/ic/dwc_gmac_reg.h Sun Oct 19 11:37:17 2014 +0000
@@ -42,13 +42,16 @@
 #define        AWIN_GMAC_MAC_ADDR0LO           0x0044
 #define        AWIN_GMAC_MII_STATUS            0x00D8
 
-#define        AWIN_GMAC_MAC_CONF_FRAMEBURST   __BIT(21)
-#define        AWIN_GMAC_MAC_CONF_MIISEL       __BIT(15)
-#define        AWIN_GMAC_MAC_CONF_FES100       __BIT(14)
-#define        AWIN_GMAC_MAC_CONF_DISABLERXOWN __BIT(13)
-#define        AWIN_GMAC_MAC_CONF_FULLDPLX     __BIT(11)
-#define        AWIN_GMAC_MAC_CONF_TXENABLE     __BIT(3)
-#define        AWIN_GMAC_MAC_CONF_RXENABLE     __BIT(2)
+#define        AWIN_GMAC_MAC_CONF_FRAMEBURST   __BIT(21) /* allow TX frameburst when
+                                                    in half duplex mode */
+#define        AWIN_GMAC_MAC_CONF_MIISEL       __BIT(15) /* select MII phy */
+#define        AWIN_GMAC_MAC_CONF_FES100       __BIT(14) /* 100 mbit mode */
+#define        AWIN_GMAC_MAC_CONF_DISABLERXOWN __BIT(13) /* do not receive our own
+                                                    TX frames in half duplex
+                                                    mode */
+#define        AWIN_GMAC_MAC_CONF_FULLDPLX     __BIT(11) /* select full duplex */
+#define        AWIN_GMAC_MAC_CONF_TXENABLE     __BIT(3)  /* enable TX dma engine */
+#define        AWIN_GMAC_MAC_CONF_RXENABLE     __BIT(2)  /* enable RX dma engine */
 
 #define        AWIN_GMAC_MAC_FFILT_PM          __BIT(4) /* promiscious multicast */
 #define        AWIN_GMAC_MAC_FFILT_HMC         __BIT(2) /* multicast hash compare */