net: stmmac: remove mac_interface

mac_interface has served little purpose, and has only caused confusion.
Now that we have cleaned up all platform glue drivers which should not
have been using mac_interface, there are no users remaining. Remove
mac_interface.

This results in the special dwmac specific "mac-mode" DT property
becoming redundant, and an in case, no DTS files in the kernel make use
of this property. Add a warning if the property is set, and it is
different from the "phy-mode".

Signed-off-by: Russell King (Oracle) <[email protected]>
Acked-by: Vladimir Zapolskiy <[email protected]>
Signed-off-by: NipaLocal <nipa@local>

Author: Russell King (Oracle)

drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c

@@ -98,8 +98,6 @@ static void loongson_default_data(struct pci_dev *pdev,
 	/* Set default value for multicast hash bins */
 	plat->multicast_filter_bins = 256;
 
-	plat->mac_interface = PHY_INTERFACE_MODE_NA;
-
 	/* Set default value for unicast filter entries */
 	plat->unicast_filter_entries = 1;
 

drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c

@@ -41,7 +41,6 @@ static int lpc18xx_dwmac_probe(struct platform_device *pdev)
 	if (IS_ERR(plat_dat))
 		return PTR_ERR(plat_dat);
 
-	plat_dat->mac_interface = PHY_INTERFACE_MODE_NA;
 	plat_dat->has_gmac = true;
 
 	reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -1118,10 +1118,7 @@ static const struct phylink_mac_ops stmmac_phylink_mac_ops = {
  */
 static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
 {
-	int interface = priv->plat->mac_interface;
-
-	if (interface == PHY_INTERFACE_MODE_NA)
-		interface = priv->plat->phy_interface;
+	int interface = priv->plat->phy_interface;
 
 	if (priv->dma_cap.pcs) {
 		if ((interface == PHY_INTERFACE_MODE_RGMII) ||

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

@@ -453,8 +453,12 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
 		return ERR_PTR(phy_mode);
 
 	plat->phy_interface = phy_mode;
+
 	rc = stmmac_of_get_mac_mode(np);
-	plat->mac_interface = rc < 0 ? plat->phy_interface : rc;
+	if (rc >= 0 && rc != phy_mode)
+		dev_warn(&pdev->dev,
+			 "\"mac-mode\" property used for %s but differs to \"phy-mode\" of %s, and will be ignored. Please report.\n",
+			 phy_modes(rc), phy_modes(phy_mode));
 
 	/* Some wrapper drivers still rely on phy_node. Let's save it while
 	 * they are not converted to phylink. */

include/linux/stmmac.h

@@ -190,8 +190,8 @@ struct plat_stmmacenet_data {
 	int bus_id;
 	int phy_addr;
 	/* MAC ----- optional PCS ----- SerDes ----- optional PHY ----- Media
-	 *                          ^            ^
-	 *                    mac_interface phy_interface
+	 *                                       ^
+	 *                                  phy_interface
 	 *
 	 * The Synopsys dwmac core only covers the MAC and an optional
 	 * integrated PCS. Where the integrated PCS is used with a SerDes,
@@ -208,12 +208,7 @@ struct plat_stmmacenet_data {
 	 * is used, this counts as "the rest of the SoC" in the above
 	 * paragraph.
 	 *
-	 * Thus, mac_interface is of little use inside the stmmac code;
-	 * please do not use unless there is a definite requirement, and
-	 * make sure to gain review feedback first.
-	 */
-	phy_interface_t mac_interface;
-	/* phy_interface is the PHY-side interface - the interface used by
+	 * phy_interface is the PHY-side interface - the interface used by
 	 * an attached PHY or SFP etc. This is equivalent to the interface
 	 * that phylink uses.
 	 */