arm: socfpga: board: Repair Micrel PHY tuning

Add proper error checking into the PHY tuning patch. Make the PHY tunning only
happen in case the KSZ9021 PHY is enabled in config. Call the config callback
after the tuning finished.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@opensource.altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Tom Rini <trini@ti.com>
Cc: Pavel Machek <pavel@denx.de>

board/altera/socfpga/socfpga_cyclone5.c

@@ -46,19 +46,41 @@ int board_init(void)
 	return 0;
 }
 
+/*
+ * PHY configuration
+ */
+#ifdef CONFIG_PHY_MICREL_KSZ9021
 int board_phy_config(struct phy_device *phydev)
 {
+	int ret;
 	/*
 	 * These skew settings for the KSZ9021 ethernet phy is required for ethernet
 	 * to work reliably on most flavors of cyclone5 boards.
 	 */
-	ksz9021_phy_extended_write(phydev, MII_KSZ9021_EXT_RGMII_RX_DATA_SKEW,
-				   0x0);
-	ksz9021_phy_extended_write(phydev, MII_KSZ9021_EXT_RGMII_TX_DATA_SKEW,
-				   0x0);
-	ksz9021_phy_extended_write(phydev, MII_KSZ9021_EXT_RGMII_CLOCK_SKEW,
-				   0xf0f0);
+	ret = ksz9021_phy_extended_write(phydev,
+					 MII_KSZ9021_EXT_RGMII_RX_DATA_SKEW,
+					 0x0);
+	if (ret)
+		return ret;
+
+	ret = ksz9021_phy_extended_write(phydev,
+					 MII_KSZ9021_EXT_RGMII_TX_DATA_SKEW,
+					 0x0);
+	if (ret)
+		return ret;
+
+	ret = ksz9021_phy_extended_write(phydev,
+					 MII_KSZ9021_EXT_RGMII_CLOCK_SKEW,
+					 0xf0f0);
+	if (ret)
+		return ret;
+
+	if (phydev->drv->config)
+		return phydev->drv->config(phydev);
+
+	return 0;
 }
+#endif
 
 #ifdef CONFIG_USB_GADGET
 struct s3c_plat_otg_data socfpga_otg_data = {