#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