net: dsa: mv88e6131: add registers access

Only 6131 was not supporting the port registers access yet. Assume such
support and use the unlock access routines in the meantime.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6131.c

@@ -157,6 +157,8 @@ struct dsa_switch_driver mv88e6131_switch_driver = {
 	.get_sset_count		= mv88e6xxx_get_sset_count,
 	.get_eeprom		= mv88e6xxx_get_eeprom,
 	.set_eeprom		= mv88e6xxx_set_eeprom,
+	.get_regs_len		= mv88e6xxx_get_regs_len,
+	.get_regs		= mv88e6xxx_get_regs,
 #ifdef CONFIG_NET_DSA_HWMON
 	.get_temp		= mv88e6xxx_get_temp,
 	.get_temp_limit		= mv88e6xxx_get_temp_limit,

drivers/net/dsa/mv88e6xxx.c

@@ -787,13 +787,17 @@ void mv88e6xxx_get_regs(struct dsa_switch *ds, int port,
 
 	memset(p, 0xff, 32 * sizeof(u16));
 
+	mutex_lock(&ps->smi_mutex);
+
 	for (i = 0; i < 32; i++) {
 		int ret;
 
-		ret = mv88e6xxx_reg_read(ps, REG_PORT(port), i);
+		ret = _mv88e6xxx_reg_read(ps, REG_PORT(port), i);
 		if (ret >= 0)
 			p[i] = ret;
 	}
+
+	mutex_unlock(&ps->smi_mutex);
 }
 
 static int _mv88e6xxx_wait(struct mv88e6xxx_priv_state *ps, int reg, int offset,