#define AT803X_LOC_MAC_ADDR_0_15_OFFSET                0x804C
 #define AT803X_LOC_MAC_ADDR_16_31_OFFSET       0x804B
 #define AT803X_LOC_MAC_ADDR_32_47_OFFSET       0x804A
-#define AT803X_MMD_ACCESS_CONTROL              0x0D
-#define AT803X_MMD_ACCESS_CONTROL_DATA         0x0E
-#define AT803X_FUNC_DATA                       0x4003
 #define AT803X_REG_CHIP_CONFIG                 0x1f
 #define AT803X_BT_BX_REG_SEL                   0x8000
 
                if (!is_valid_ether_addr(mac))
                        return -EINVAL;
 
-               for (i = 0; i < 3; i++) {
-                       phy_write(phydev, AT803X_MMD_ACCESS_CONTROL,
-                                 AT803X_DEVICE_ADDR);
-                       phy_write(phydev, AT803X_MMD_ACCESS_CONTROL_DATA,
-                                 offsets[i]);
-                       phy_write(phydev, AT803X_MMD_ACCESS_CONTROL,
-                                 AT803X_FUNC_DATA);
-                       phy_write(phydev, AT803X_MMD_ACCESS_CONTROL_DATA,
-                                 mac[(i * 2) + 1] | (mac[(i * 2)] << 8));
-               }
+               for (i = 0; i < 3; i++)
+                       phy_write_mmd(phydev, AT803X_DEVICE_ADDR, offsets[i],
+                                     mac[(i * 2) + 1] | (mac[(i * 2)] << 8));
 
                value = phy_read(phydev, AT803X_INTR_ENABLE);
                value |= AT803X_INTR_ENABLE_WOL;