+#define MII_KSZ9031_FLP_BURST_TX_LO 0x3
+#define MII_KSZ9031_FLP_BURST_TX_HI 0x4
+
+#define MII_KSZ9x31_SILICON_REV_MASK 0xfffff0
+
+#define MII_KSZ9131_RXTXDLL_BYPASS BIT(12)
+#define MII_KSZ9131_EXT_RGMII_2NS_SKEW_RXDLL 0x4c
+#define MII_KSZ9131_EXT_RGMII_2NS_SKEW_TXDLL 0x4d
+
+#define PHY_ID_KSZ9031 0x00221620
+#define PHY_ID_KSZ9131 0x00221640
+
+
+/* Registers */
+#define MMD_ACCESS_CONTROL 0xd
+#define MMD_ACCESS_REG_DATA 0xe
+