net: dsa: dsa_loop: add phylink capabilities

Add phylink capabilities for dsa_loop, which I believe being a software
construct means that it supports essentially all interface types and
all speeds.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/dsa_loop.c

@@ -277,6 +277,14 @@ static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
 	return ETH_MAX_MTU;
 }
 
+static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port,
+				      struct phylink_config *config)
+{
+	bitmap_fill(config->supported_interfaces, PHY_INTERFACE_MODE_MAX);
+	__clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces);
+	config->mac_capabilities = ~0;
+}
+
 static const struct dsa_switch_ops dsa_loop_driver = {
 	.get_tag_protocol	= dsa_loop_get_protocol,
 	.setup			= dsa_loop_setup,
@@ -295,6 +303,7 @@ static const struct dsa_switch_ops dsa_loop_driver = {
 	.port_vlan_del		= dsa_loop_port_vlan_del,
 	.port_change_mtu	= dsa_loop_port_change_mtu,
 	.port_max_mtu		= dsa_loop_port_max_mtu,
+	.phylink_get_caps	= dsa_loop_phylink_get_caps,
 };
 
 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)