diff --git a/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 367f7f1..56db8c7 100755
--- a/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -570,8 +570,11 @@
 #define MTK_PHY_IAC		0x10004
 #define PHY_IAC_ACCESS		BIT(31)
 #define PHY_IAC_READ		BIT(19)
+#define PHY_IAC_READ_C45	(3 << 18)
+#define PHY_IAC_ADDR_C45	(0 << 18)
 #define PHY_IAC_WRITE		BIT(18)
 #define PHY_IAC_START		BIT(16)
+#define PHY_IAC_START_C45	(0 << 16)
 #define PHY_IAC_ADDR_SHIFT	20
 #define PHY_IAC_REG_SHIFT	25
 #define PHY_IAC_TIMEOUT		HZ