diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index abb6106f839d82d489ef5659e80247a026df012d..697ca7795bd9db6f2ac4fabdce77dc5bbc98f01b 100644
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -3,6 +3,11 @@
 
 #include <linux/phy.h>
 
+/* All Broadcom Ethernet switches have a pseudo-PHY at address 30 which is used
+ * to configure the switch internal registers via MDIO accesses.
+ */
+#define BRCM_PSEUDO_PHY_ADDR           30
+
 #define PHY_ID_BCM50610			0x0143bd60
 #define PHY_ID_BCM50610M		0x0143bd70
 #define PHY_ID_BCM5241			0x0143bc30