net: dsa: mv88e6xxx: 88E6141/6341 SERDES support

The 88E6141/6341 switches (also known as Topaz) have 1 SGMII lane,
which can be configured the same way as the SERDES lane on 88E6390.

Signed-off-by: Marek Behun <marek.behun@nic.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.h b/drivers/net/dsa/mv88e6xxx/serdes.h
index 1897c01..b6e5fbd 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.h
+++ b/drivers/net/dsa/mv88e6xxx/serdes.h
@@ -19,6 +19,8 @@
 #define MV88E6352_ADDR_SERDES		0x0f
 #define MV88E6352_SERDES_PAGE_FIBER	0x01
 
+#define MV88E6341_ADDR_SERDES		0x15
+
 #define MV88E6390_PORT9_LANE0		0x09
 #define MV88E6390_PORT9_LANE1		0x12
 #define MV88E6390_PORT9_LANE2		0x13
@@ -42,6 +44,7 @@
 #define MV88E6390_SGMII_CONTROL_LOOPBACK	BIT(14)
 #define MV88E6390_SGMII_CONTROL_PDOWN		BIT(11)
 
+int mv88e6341_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6352_serdes_get_sset_count(struct mv88e6xxx_chip *chip, int port);