[PATCH RFC net-next 3/8] net: dsa: mark DSA phylink as legacy_pre_march2020

[Russell King (Oracle)]

As DSA doesn't make use of the PCS support, but it does have PCS, it
must be marked as a pre-March 2020 driver to maintain the old phylink
behaviour.

Signed-off-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>
---
 net/dsa/port.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/dsa/port.c b/net/dsa/port.c
index eaa66114924b..cfb48dc57f73 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -1091,6 +1091,13 @@ int dsa_port_phylink_create(struct dsa_port *dp)
 	if (err)
 		mode = PHY_INTERFACE_MODE_NA;
 
+	/* Presence of phylink_mac_link_state or phylink_mac_an_restart is
+	 * an indicator of a legacy phylink driver.
+	 */
+	if (ds->ops->phylink_mac_link_state ||
+	    ds->ops->phylink_mac_an_restart)
+		dp->pl_config.legacy_pre_march2020 = true;
+
 	if (ds->ops->phylink_get_interfaces)
 		ds->ops->phylink_get_interfaces(ds, dp->index,
 					dp->pl_config.supported_interfaces);
-- 
2.30.2