net: pcs: pcs-xpcs: Convert to mdiobus_c45_read

Stop using the helpers to construct a special mdio address which
indicates C45. Instead use the C45 accessors, which will call the
busses C45 specific read/write API.
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/pcs/pcs-xpcs.c

@@ -175,20 +175,18 @@ static bool __xpcs_linkmode_supported(const struct xpcs_compat *compat,
 
 int xpcs_read(struct dw_xpcs *xpcs, int dev, u32 reg)
 {
-	u32 reg_addr = mdiobus_c45_addr(dev, reg);
 	struct mii_bus *bus = xpcs->mdiodev->bus;
 	int addr = xpcs->mdiodev->addr;
 
-	return mdiobus_read(bus, addr, reg_addr);
+	return mdiobus_c45_read(bus, addr, dev, reg);
 }
 
 int xpcs_write(struct dw_xpcs *xpcs, int dev, u32 reg, u16 val)
 {
-	u32 reg_addr = mdiobus_c45_addr(dev, reg);
 	struct mii_bus *bus = xpcs->mdiodev->bus;
 	int addr = xpcs->mdiodev->addr;
 
-	return mdiobus_write(bus, addr, reg_addr, val);
+	return mdiobus_c45_write(bus, addr, dev, reg, val);
 }
 
 static int xpcs_read_vendor(struct dw_xpcs *xpcs, int dev, u32 reg)