net: mdio: scan bus based on bus capabilities for C22 and C45

Now that all MDIO bus drivers which set probe_capabilities to
MDIOBUS_C22_C45 have been converted to use the name API for C45
transactions, perform the scanning of the bus based on which methods
the bus provides.
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NMichael Walle <michael@walle.cc>
Reviewed-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: NPaolo Abeni <pabeni@redhat.com>

drivers/net/phy/mdio_bus.c

@@ -711,9 +711,7 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
 			goto error_reset_gpiod;
 	}
 
-	if (bus->probe_capabilities == MDIOBUS_NO_CAP ||
-	    bus->probe_capabilities == MDIOBUS_C22 ||
-	    bus->probe_capabilities == MDIOBUS_C22_C45) {
+	if (bus->read) {
 		err = mdiobus_scan_bus_c22(bus);
 		if (err)
 			goto error;
@@ -721,9 +719,7 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
 
 	prevent_c45_scan = mdiobus_prevent_c45_scan(bus);
 
-	if (!prevent_c45_scan &&
-	    (bus->probe_capabilities == MDIOBUS_C45 ||
-	     bus->probe_capabilities == MDIOBUS_C22_C45)) {
+	if (!prevent_c45_scan && bus->read_c45) {
 		err = mdiobus_scan_bus_c45(bus);
 		if (err)
 			goto error;