diff --git a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/platform.h b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/platform.h
index 0d9b5d23455..2a61d059764 100644
--- a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/platform.h
+++ b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/platform.h
@@ -23,7 +23,6 @@ struct ag71xx_platform_data {
 	int		speed;
 	int		duplex;
 	u32		reset_bit;
-	u32		mii_if;
 	u8		mac_addr[ETH_ALEN];
 	struct device	*mii_bus_dev;
 
diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h
index 1076d3c04e0..5757e60ac15 100644
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h
@@ -343,7 +343,6 @@ static inline int ag71xx_desc_pktlen(struct ag71xx_desc *desc)
 #define RX_STATUS_OF		BIT(2)	/* Rx Overflow */
 #define RX_STATUS_BE		BIT(3)	/* Bus Error */
 
-#define MII_CTRL_IF_MASK	3
 #define MII_CTRL_SPEED_SHIFT	4
 #define MII_CTRL_SPEED_MASK	3
 #define MII_CTRL_SPEED_10	0
@@ -436,17 +435,6 @@ static inline u32 ag71xx_mii_ctrl_rr(struct ag71xx *ag)
 	return __raw_readl(ag->mii_ctrl);
 }
 
-static inline void ag71xx_mii_ctrl_set_if(struct ag71xx *ag,
-					  unsigned int mii_if)
-{
-	u32 t;
-
-	t = ag71xx_mii_ctrl_rr(ag);
-	t &= ~(MII_CTRL_IF_MASK);
-	t |= (mii_if & MII_CTRL_IF_MASK);
-	ag71xx_mii_ctrl_wr(ag, t);
-}
-
 static inline void ag71xx_mii_ctrl_set_speed(struct ag71xx *ag,
 					     unsigned int speed)
 {
diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
index c541933cec5..2ba0150f43d 100644
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
@@ -444,9 +444,6 @@ static void ag71xx_hw_setup(struct ag71xx *ag)
 	/* setup max frame length */
 	ag71xx_wr(ag, AG71XX_REG_MAC_MFL, AG71XX_TX_MTU_LEN);
 
-	/* setup MII interface type */
-	ag71xx_mii_ctrl_set_if(ag, pdata->mii_if);
-
 	/* setup FIFO configuration registers */
 	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG0, FIFO_CFG0_INIT);
 	if (pdata->is_ar724x) {