net: dsa: microchip: lan937x: add phylink_get_caps support

The internal phy of the LAN937x are capable of 100Mbps Full duplex. The
xMII port of switch is capable of 10Mbps Full & Half Duplex, 100Mbps
Full & Half Duplex and 1000Mbps Half duplex. xMII port also supports Tx
and Rx Flow control.
Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/microchip/ksz_common.c

@@ -220,6 +220,7 @@ static const struct ksz_dev_ops lan937x_dev_ops = {
 	.vlan_del = ksz9477_port_vlan_del,
 	.mirror_add = ksz9477_port_mirror_add,
 	.mirror_del = ksz9477_port_mirror_del,
+	.get_caps = lan937x_phylink_get_caps,
 	.fdb_dump = ksz9477_fdb_dump,
 	.fdb_add = ksz9477_fdb_add,
 	.fdb_del = ksz9477_fdb_del,

drivers/net/dsa/microchip/lan937x.h

@@ -15,4 +15,6 @@ void lan937x_switch_exit(struct ksz_device *dev);
 void lan937x_r_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 *data);
 void lan937x_w_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 val);
 int lan937x_change_mtu(struct ksz_device *dev, int port, int new_mtu);
+void lan937x_phylink_get_caps(struct ksz_device *dev, int port,
+			      struct phylink_config *config);
 #endif

drivers/net/dsa/microchip/lan937x_main.c

@@ -312,6 +312,18 @@ int lan937x_change_mtu(struct ksz_device *dev, int port, int new_mtu)
 	return 0;
 }
 
+void lan937x_phylink_get_caps(struct ksz_device *dev, int port,
+			      struct phylink_config *config)
+{
+	config->mac_capabilities = MAC_100FD;
+
+	if (dev->info->supports_rgmii[port]) {
+		/* MII/RMII/RGMII ports */
+		config->mac_capabilities |= MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
+					    MAC_100HD | MAC_10 | MAC_1000FD;
+	}
+}
+
 int lan937x_setup(struct dsa_switch *ds)
 {
 	struct ksz_device *dev = ds->priv;