net: dsa: mv88e6xxx: merge mv88e6352_serdes_power_set

The mv88e6352_serdes_power_set helper is only used at one place, in
mv88e6352_serdes_power. Keep it simple and merge the two functions
together.

Use mv88e6xxx_serdes_get_lane instead of mv88e6352_port_has_serdes
to avoid moving code. No functional changes.
Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/serdes.c

@@ -49,11 +49,14 @@ static int mv88e6390_serdes_write(struct mv88e6xxx_chip *chip,
 	return mv88e6xxx_phy_write(chip, lane, reg_c45, val);
 }
 
-static int mv88e6352_serdes_power_set(struct mv88e6xxx_chip *chip, bool on)
+int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 {
 	u16 val, new_val;
 	int err;
 
+	if (!mv88e6xxx_serdes_get_lane(chip, port))
+		return 0;
+
 	err = mv88e6352_serdes_read(chip, MII_BMCR, &val);
 	if (err)
 		return err;
@@ -90,19 +93,6 @@ static bool mv88e6352_port_has_serdes(struct mv88e6xxx_chip *chip, int port)
 	return false;
 }
 
-int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
-{
-	int err;
-
-	if (mv88e6352_port_has_serdes(chip, port)) {
-		err = mv88e6352_serdes_power_set(chip, on);
-		if (err < 0)
-			return err;
-	}
-
-	return 0;
-}
-
 struct mv88e6352_serdes_hw_stat {
 	char string[ETH_GSTRING_LEN];
 	int sizeof_stat;