net: lan743x: add fixed phy support for LAN7431 device

Add fixed_phy support at 1Gbps full duplex for the lan7431 device
if a phy not found over MDIO. Tested with a MAC to MAC connection
from LAN7431 to a KSZ9893 switch. This avoids the Driver open error
in LAN743x. TX delay and internal CLK125 generation is already
enabled in EEPROM.

Signed-off-by: Pavithra Sathyanarayanan <Pavithra.Sathyanarayanan@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
index fe3026ed6f03dab217f92839e761b8eb06a4c8a0..b5add1c5fa064e7389da2264010ae8c1d976d93b 100644 (file)
--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -1491,6 +1491,11 @@ static int lan743x_phy_open(struct lan743x_adapter *adapter)
 {
        struct net_device *netdev = adapter->netdev;
        struct lan743x_phy *phy = &adapter->phy;
+       struct fixed_phy_status fphy_status = {
+               .link = 1,
+               .speed = SPEED_1000,
+               .duplex = DUPLEX_FULL,
+       };
        struct phy_device *phydev;
        int ret = -EIO;
 
@@ -1501,8 +1506,19 @@ static int lan743x_phy_open(struct lan743x_adapter *adapter)
        if (!phydev) {
                /* try internal phy */
                phydev = phy_find_first(adapter->mdiobus);
-               if (!phydev)
-                       goto return_error;
+               if (!phydev)    {
+                       if ((adapter->csr.id_rev & ID_REV_ID_MASK_) ==
+                                       ID_REV_ID_LAN7431_) {
+                               phydev = fixed_phy_register(PHY_POLL,
+                                                           &fphy_status, NULL);
+                               if (IS_ERR(phydev)) {
+                                       netdev_err(netdev, "No PHY/fixed_PHY found\n");
+                                       return -EIO;
+                               }
+                       } else {
+                               goto return_error;
+                               }
+               }
 
                lan743x_phy_interface_select(adapter);