This adds support for enabling the internal phy for a 'cpu' port.
It has been tested on GE B850v3 and B650v3, which have a built-in
MV88E6240 switch connected to a PCIe based network card. Without
this patch the link does not come up and no traffic can be routed
through the switch.

Signed-off-by: Sebastian Reichel <sebastian.reic...@collabora.co.uk>
---
 net/dsa/port.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/net/dsa/port.c b/net/dsa/port.c
index bb4be2679904..f99c1d34416c 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -282,6 +282,10 @@ int dsa_port_fixed_link_register_of(struct dsa_port *dp)
        int mode;
        int err;
 
+       mode = of_get_phy_mode(dn);
+       if (mode < 0)
+               mode = PHY_INTERFACE_MODE_NA;
+
        if (of_phy_is_fixed_link(dn)) {
                err = of_phy_register_fixed_link(dn);
                if (err) {
@@ -292,10 +296,6 @@ int dsa_port_fixed_link_register_of(struct dsa_port *dp)
                }
 
                phydev = of_phy_find_device(dn);
-
-               mode = of_get_phy_mode(dn);
-               if (mode < 0)
-                       mode = PHY_INTERFACE_MODE_NA;
                phydev->interface = mode;
 
                genphy_config_init(phydev);
@@ -305,6 +305,24 @@ int dsa_port_fixed_link_register_of(struct dsa_port *dp)
                        ds->ops->adjust_link(ds, port, phydev);
 
                put_device(&phydev->mdio.dev);
+       } else if (mode == PHY_INTERFACE_MODE_INTERNAL ||
+                  mode == PHY_INTERFACE_MODE_NA) {
+               phydev = mdiobus_get_phy(ds->slave_mii_bus, port);
+               if (phydev) {
+                       genphy_config_init(phydev);
+                       genphy_resume(phydev);
+                       genphy_read_status(phydev);
+
+                       if (ds->ops->adjust_link)
+                               ds->ops->adjust_link(ds, port, phydev);
+
+                       dev_dbg(ds->dev, "enabled cpu port's phy: %s",
+                               phydev_name(phydev));
+               } else {
+                       dev_warn(ds->dev, "cpu port has no internal phy and no 
fixed linked has been configured!");
+               }
+       } else {
+               dev_err(ds->dev, "unsupported phy mode!");
        }
 
        return 0;
-- 
2.15.1

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