net/phy: fix select line for TN80xx

TN80xx has same PHY ID as TN2020, but it needs different setting to register
30.93 which used to select line, so we read register 30.32 which has
bit 15:12 to indicate PHY hardware version, for TN20xx we will get 3 or 2,
for TN80xx we will get 5 or 4.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

drivers/net/phy/teranetics.c

@@ -34,9 +34,21 @@ int tn2020_config(struct phy_device *phydev)
 		unsigned short restart_an = (MDIO_AN_CTRL1_RESTART |
 						MDIO_AN_CTRL1_ENABLE |
 						MDIO_AN_CTRL1_XNP);
+		u8 phy_hwversion;
 
-		phy_write(phydev, 30, 93, 2);
-		phy_write(phydev, MDIO_MMD_AN, MDIO_CTRL1, restart_an);
+		/*
+		 * bit 15:12 of register 30.32 indicates PHY hardware
+		 * version. It can be used to distinguish TN80xx from
+		 * TN2020. TN2020 needs write 0x2 to 30.93, but TN80xx
+		 * needs 0x1.
+		 */
+		phy_hwversion = (phy_read(phydev, 30, 32) >> 12) & 0xf;
+		if (phy_hwversion <= 3) {
+			phy_write(phydev, 30, 93, 2);
+			phy_write(phydev, MDIO_MMD_AN, MDIO_CTRL1, restart_an);
+		} else {
+			phy_write(phydev, 30, 93, 1);
+		}
 	}
 
 	return 0;