/* This flag currently only has
* meaning if we're using the eTSEC */
-#define TSEC_REDUCED (1 << 1)
-
-#define TSEC_SGMII (1 << 2)
+#define TSEC_REDUCED (1 << 1) /* MAC-PHY interface uses RGMII */
+#define TSEC_SGMII (1 << 2) /* MAC-PHY interface uses SGMII */
+#define TSEC_FIBER (1 << 3) /* PHY uses fiber, eg 1000 Base-X */
struct tsec_private {
volatile tsec_t *regs;