With the phy_port infrastructure came an ethernet-connector binding,
allowing to represent the MDI of a PHY in devicetree. This allows
specifying the mediums and pairs of a port.

Let's initialize the port's supported list based on what the PHY
reports, so that we can then filter it with what the connector allows
using.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 drivers/net/phy/phy_device.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 8a3eb1839a3d..9b8eaac63b90 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -3499,6 +3499,9 @@ static int of_phy_ports(struct phy_device *phydev)
 
 		port->parent_type = PHY_PORT_PHY;
 		port->phy = phydev;
+
+		linkmode_copy(port->supported, phydev->supported);
+
 		err = phy_add_port(phydev, port);
 		if (err) {
 			phy_port_destroy(port);
-- 
2.49.0