The 88x3310 and 88x3340 PHYs don't support the isolation mode,
regardless of the MII mode being used
(SGMII/1000BaseX/2500BaseX/5GBaseR/10GBaseR). Flag this in the driver.

This was confirmed on the 88x3310 on a MacchiatoBin.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 drivers/net/phy/marvell10g.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 6642eb642d4b..867fd1451b3f 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -1422,6 +1422,7 @@ static struct phy_driver mv3310_drivers[] = {
 		.set_loopback	= genphy_c45_loopback,
 		.get_wol	= mv3110_get_wol,
 		.set_wol	= mv3110_set_wol,
+		.flags		= PHY_NO_ISOLATE,
 	},
 	{
 		.phy_id		= MARVELL_PHY_ID_88X3310,
@@ -1441,6 +1442,7 @@ static struct phy_driver mv3310_drivers[] = {
 		.set_tunable	= mv3310_set_tunable,
 		.remove		= mv3310_remove,
 		.set_loopback	= genphy_c45_loopback,
+		.flags		= PHY_NO_ISOLATE,
 	},
 	{
 		.phy_id		= MARVELL_PHY_ID_88E2110,
-- 
2.46.0