diff --git a/include/libopencm3/ethernet/phy.h b/include/libopencm3/ethernet/phy.h
old mode 100644
new mode 100755
index 325695cb..e3c1b95d
--- a/include/libopencm3/ethernet/phy.h
+++ b/include/libopencm3/ethernet/phy.h
@@ -64,6 +64,8 @@
 #define PHY_REG_BSR_FAULT       (1<<4)
 #define PHY_REG_BSR_ANDONE      (1<<5)
 
+#define PHY0 0
+#define PHY1 1
 
 enum phy_status {
 	LINK_DOWN,
@@ -77,13 +79,13 @@ enum phy_status {
 	LINK_FD_10000M,
 };
 
-void phy_reset(void);
-bool phy_link_isup(void);
+void phy_reset(uint8_t phy);
+bool phy_link_isup(uint8_t phy);
 
-enum phy_status phy_link_status(void);
+enum phy_status phy_link_status(uint8_t phy);
 
-void phy_autoneg_force(enum phy_status mode);
-void phy_autoneg_enable(void);
+void phy_autoneg_force(uint8_t phy, enum phy_status mode);
+void phy_autoneg_enable(uint8_t phy);
 
 /**@}*/
 
diff --git a/lib/ethernet/phy.c b/lib/ethernet/phy.c
old mode 100644
new mode 100755
index 4866198a..363e1466
--- a/lib/ethernet/phy.c
+++ b/lib/ethernet/phy.c
@@ -40,23 +40,24 @@
 /*---------------------------------------------------------------------------*/
 /** @brief Is the link up ?
  *
+ * @param[in] phy uint8_t phy ID of the PHY
  * @returns bool true, if link is up
  */
-bool phy_link_isup(void)
+bool phy_link_isup(uint8_t phy)
 {
-	return eth_smi_read(1, PHY_REG_BSR) & PHY_REG_BSR_UP;
+	return eth_smi_read(phy, PHY_REG_BSR) & PHY_REG_BSR_UP;
 }
 
 /*---------------------------------------------------------------------------*/
 /** @brief Reset the PHY
  *
  * Reset the PHY chip and wait for done
+ * @param[in] phy uint8_t phy ID of the PHY
  */
-void phy_reset(void)
+void phy_reset(uint8_t phy)
 {
-	eth_smi_write(1, PHY_REG_BCR, PHY_REG_BCR_RESET);
-
-	while (eth_smi_read(1, PHY_REG_BCR) & PHY_REG_BCR_RESET);
+	eth_smi_write(phy, PHY_REG_BCR, PHY_REG_BCR_RESET);
+	while (eth_smi_read(phy, PHY_REG_BCR) & PHY_REG_BCR_RESET);
 }
 
 /*---------------------------------------------------------------------------*/
diff --git a/lib/ethernet/phy_ksz8051mll.c b/lib/ethernet/phy_ksz8051mll.c
index b045ef62..275b5db9 100755
--- a/lib/ethernet/phy_ksz8051mll.c
+++ b/lib/ethernet/phy_ksz8051mll.c
@@ -43,11 +43,12 @@
  *
  * Retrieve the link speed and duplex status of the link.
  *
+ * @param[in] phy uint8_t phy ID of the PHY
  * @returns ::phy_status Link status
  */
-enum phy_status phy_link_status(void)
+enum phy_status phy_link_status(uint8_t phy)
 {
-	return eth_smi_read(1, PHY_REG_CR1) & 0x07;
+	return eth_smi_read(phy, PHY_REG_CR1) & 0x07;
 }
 
 /*---------------------------------------------------------------------------*/
@@ -55,9 +56,10 @@ enum phy_status phy_link_status(void)
  *
  * Force the autonegotiation and set link speed and duplex mode of the link
  *
+ * @param[in] phy uint8_t phy ID of the PHY
  * @param[in] mode enum phy_status Desired link status
  */
-void phy_autoneg_force(enum phy_status mode)
+void phy_autoneg_force(uint8_t phy, enum phy_status mode)
 {
 	uint16_t bst = 0;
 
@@ -70,7 +72,7 @@ void phy_autoneg_force(enum phy_status mode)
 		bst |= PHY_REG_BCR_100M;
 	}
 
-	eth_smi_bit_op(1, PHY_REG_BCR, bst,
+	eth_smi_bit_op(phy, PHY_REG_BCR, bst,
 		    ~(PHY_REG_BCR_AN | PHY_REG_BCR_100M | PHY_REG_BCR_FD));
 }
 
@@ -78,10 +80,12 @@ void phy_autoneg_force(enum phy_status mode)
 /** @brief Enable the autonegotiation
  *
  * Enable the autonegotiation of the link speed and duplex mode
+ *
+ * @param[in] phy uint8_t phy ID of the PHY
  */
-void phy_autoneg_enable(void)
+void phy_autoneg_enable(uint8_t phy)
 {
-	eth_smi_bit_set(1, PHY_REG_BCR, PHY_REG_BCR_AN | PHY_REG_BCR_ANRST);
+	eth_smi_bit_set(phy, PHY_REG_BCR, PHY_REG_BCR_AN | PHY_REG_BCR_ANRST);
 }
 
 /*---------------------------------------------------------------------------*/