diff --git a/target/linux/mediatek/files-5.4/drivers/net/phy/air_en8811h_api.h b/target/linux/mediatek/files-5.4/drivers/net/phy/air_en8811h_api.h
new file mode 100644
index 0000000..a1d97ce
--- /dev/null
+++ b/target/linux/mediatek/files-5.4/drivers/net/phy/air_en8811h_api.h
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*************************************************
+ * FILE NAME:  air_en8811h_api.h
+ * PURPOSE:
+ *      EN8811H PHY Driver for Linux
+ * NOTES:
+ *
+ *  Copyright (C) 2023 Airoha Technology Corp.
+ *************************************************/
+#ifndef __EN8811H_API_H
+#define __EN8811H_API_H
+#include <linux/version.h>
+
+#if (KERNEL_VERSION(4, 5, 0) > LINUX_VERSION_CODE)
+#define phydev_mdio_bus(_dev) (_dev->bus)
+#define phydev_addr(_dev) (_dev->addr)
+#define phydev_dev(_dev) (&_dev->dev)
+#else
+#define phydev_mdio_bus(_dev) (_dev->mdio.bus)
+#define phydev_addr(_dev) (_dev->mdio.addr)
+#define phydev_dev(_dev) (&_dev->mdio.dev)
+#endif
+
+#define BUFFER_LENGTH 512
+
+#define DEBUGFS_COUNTER		        "counter"
+#define DEBUGFS_DRIVER_INFO	        "drvinfo"
+#define DEBUGFS_PORT_MODE           "port_mode"
+#define DEBUGFS_BUCKPBUS_OP         "buckpbus_op"
+#define DEBUGFS_PBUS_OP             "pbus_op"
+#define DEBUGFS_POLARITY            "polarity"
+#define DEBUGFS_LINK_STATUS         "link_status"
+#define DEBUGFS_DBG_REG_SHOW        "dbg_regs_show"
+
+enum air_port_mode {
+	AIR_PORT_MODE_FORCE_100,
+	AIR_PORT_MODE_FORCE_1000,
+	AIR_PORT_MODE_FORCE_2500,
+	AIR_PORT_MODE_AUTONEGO,
+	AIR_PORT_MODE_POWER_DOWN,
+	AIR_PORT_MODE_POWER_UP,
+	AIR_PORT_MODE_FC_UNSUPPORT,
+	AIR_PORT_MODE_FC_SUPPORT,
+	AIR_PORT_MODE_FC_DIS,
+	AIR_PORT_MODE_FC_EN,
+	AIR_PORT_MODE_LAST = 0xFF,
+};
+
+enum air_polarity {
+	AIR_POL_TX_REV_RX_NOR,
+	AIR_POL_TX_NOR_RX_NOR,
+	AIR_POL_TX_REV_RX_REV,
+	AIR_POL_TX_NOR_RX_REV,
+	AIR_POL_TX_NOR_RX_LAST = 0xff,
+};
+
+/* Link mode bit indices */
+enum air_link_mode_bit {
+	AIR_LINK_MODE_10baseT_Half_BIT	 = 0,
+	AIR_LINK_MODE_10baseT_Full_BIT	 = 1,
+	AIR_LINK_MODE_100baseT_Half_BIT	 = 2,
+	AIR_LINK_MODE_100baseT_Full_BIT	 = 3,
+	AIR_LINK_MODE_1000baseT_Full_BIT = 4,
+	AIR_LINK_MODE_2500baseT_Full_BIT = 5,
+};
+
+#ifndef unlikely
+#  define unlikely(x)	(x)
+#endif
+int air_pbus_reg_write(struct phy_device *phydev,
+	unsigned int pbus_address, unsigned int pbus_data);
+int air_mii_cl22_write(struct mii_bus *ebus, int addr,
+	unsigned int phy_register, unsigned int write_data);
+int air_mii_cl22_read(struct mii_bus *ebus,
+	int addr, unsigned int phy_register);
+int air_mii_cl45_read(struct phy_device *phydev, int devad, u16 reg);
+int air_mii_cl45_write(struct phy_device *phydev,
+	int devad, u16 reg, u16 write_data);
+unsigned int air_buckpbus_reg_read(struct phy_device *phydev,
+	unsigned int pbus_address);
+int air_buckpbus_reg_write(struct phy_device *phydev,
+	unsigned int pbus_address, unsigned int pbus_data);
+#ifdef CONFIG_AIROHA_EN8811H_PHY_DEBUGFS
+int airphy_debugfs_init(struct phy_device *phydev);
+void air_debugfs_remove(struct phy_device *phydev);
+#endif /*CONFIG_AIROHA_EN8811H_PHY_DEBUGFS*/
+#endif /* End of __EN8811H_API_H */