net: dsa: mv88e6xxx: add port ATU learn limit op

Add a new operation to disable the limiting of learnt MAC addresses.

Setting such limit is not likely to be used soon, so provide a
port_disable_learn_limit operation directly. This can be changed later
for port_set_learn_limit when we'll need it.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/mv88e6xxx.h

@@ -871,6 +871,7 @@ struct mv88e6xxx_ops {
 
 	int (*port_egress_rate_limiting)(struct mv88e6xxx_chip *chip, int port);
 	int (*port_pause_config)(struct mv88e6xxx_chip *chip, int port);
+	int (*port_disable_learn_limit)(struct mv88e6xxx_chip *chip, int port);
 
 	/* CMODE control what PHY mode the MAC will use, eg. SGMII, RGMII, etc.
 	 * Some chips allow this to be configured on specific ports.

drivers/net/dsa/mv88e6xxx/port.c

@@ -805,6 +805,13 @@ int mv88e6097_port_egress_rate_limiting(struct mv88e6xxx_chip *chip, int port)
 	return mv88e6xxx_port_write(chip, port, PORT_RATE_CONTROL, 0x0001);
 }
 
+/* Offset 0x0C: Port ATU Control */
+
+int mv88e6xxx_port_disable_learn_limit(struct mv88e6xxx_chip *chip, int port)
+{
+	return mv88e6xxx_port_write(chip, port, PORT_ATU_CONTROL, 0);
+}
+
 /* Offset 0x0f: Port Ether type */
 
 int mv88e6351_port_set_ether_type(struct mv88e6xxx_chip *chip, int port,

drivers/net/dsa/mv88e6xxx/port.h

@@ -75,4 +75,7 @@ int mv88e6xxx_port_get_cmode(struct mv88e6xxx_chip *chip, int port, u8 *cmode);
 int mv88e6xxx_port_set_map_da(struct mv88e6xxx_chip *chip, int port);
 int mv88e6095_port_set_upstream_port(struct mv88e6xxx_chip *chip, int port,
 				     int upstream_port);
+
+int mv88e6xxx_port_disable_learn_limit(struct mv88e6xxx_chip *chip, int port);
+
 #endif /* _MV88E6XXX_PORT_H */