net: stmmac: Make stmmac_xpcs_setup() generic to all PCS devices

A pcs_init() callback will be introduced to stmmac in a future patch. This
new function will be called during the hardware initialization phase.
Instead of separately initializing XPCS and PCS components, let's group all
PCS-related hardware initialization logic in the current
stmmac_xpcs_setup() function.

Rename stmmac_xpcs_setup() to stmmac_pcs_setup() and move the conditional
call to stmmac_xpcs_setup() inside the function itself.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Co-developed-by: Romain Gantois <romain.gantois@bootlin.com>
Signed-off-by: Romain Gantois <romain.gantois@bootlin.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Hariprasad Kelam <hkelam@marvell.com>
Link: https://lore.kernel.org/r/20240513-rzn1-gmac1-v7-3-6acf58b5440d@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/stmmac.h

@@ -360,7 +360,7 @@ enum stmmac_state {
 int stmmac_mdio_unregister(struct net_device *ndev);
 int stmmac_mdio_register(struct net_device *ndev);
 int stmmac_mdio_reset(struct mii_bus *mii);
-int stmmac_xpcs_setup(struct mii_bus *mii);
+int stmmac_pcs_setup(struct net_device *ndev);
 void stmmac_pcs_clean(struct net_device *ndev);
 void stmmac_set_ethtool_ops(struct net_device *netdev);
 

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

@@ -7754,11 +7754,9 @@ int stmmac_dvr_probe(struct device *device,
 	if (priv->plat->speed_mode_2500)
 		priv->plat->speed_mode_2500(ndev, priv->plat->bsp_priv);
 
-	if (priv->plat->mdio_bus_data && priv->plat->mdio_bus_data->has_xpcs) {
-		ret = stmmac_xpcs_setup(priv->mii);
-		if (ret)
-			goto error_xpcs_setup;
-	}
+	ret = stmmac_pcs_setup(ndev);
+	if (ret)
+		goto error_pcs_setup;
 
 	ret = stmmac_phy_setup(priv);
 	if (ret) {
@@ -7791,7 +7789,7 @@ int stmmac_dvr_probe(struct device *device,
 	phylink_destroy(priv->phylink);
 error_phy_setup:
 	stmmac_pcs_clean(ndev);
-error_xpcs_setup:
+error_pcs_setup:
 	if (priv->hw->pcs != STMMAC_PCS_TBI &&
 	    priv->hw->pcs != STMMAC_PCS_RTBI)
 		stmmac_mdio_unregister(ndev);

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

@@ -495,31 +495,37 @@ int stmmac_mdio_reset(struct mii_bus *bus)
 	return 0;
 }
 
-int stmmac_xpcs_setup(struct mii_bus *bus)
+int stmmac_pcs_setup(struct net_device *ndev)
 {
-	struct net_device *ndev = bus->priv;
+	struct dw_xpcs *xpcs = NULL;
 	struct stmmac_priv *priv;
-	struct dw_xpcs *xpcs;
+	int ret = -ENODEV;
 	int mode, addr;
 
 	priv = netdev_priv(ndev);
 	mode = priv->plat->phy_interface;
 
-	/* Try to probe the XPCS by scanning all addresses. */
-	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
-		xpcs = xpcs_create_mdiodev(bus, addr, mode);
-		if (IS_ERR(xpcs))
-			continue;
+	if (priv->plat->mdio_bus_data && priv->plat->mdio_bus_data->has_xpcs) {
+		/* Try to probe the XPCS by scanning all addresses */
+		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
+			xpcs = xpcs_create_mdiodev(priv->mii, addr, mode);
+			if (IS_ERR(xpcs))
+				continue;
 
-		priv->hw->xpcs = xpcs;
-		break;
+			ret = 0;
+			break;
+		}
+	} else {
+		return 0;
 	}
 
-	if (!priv->hw->xpcs) {
+	if (ret) {
 		dev_warn(priv->device, "No xPCS found\n");
-		return -ENODEV;
+		return ret;
 	}
 
+	priv->hw->xpcs = xpcs;
+
 	return 0;
 }