Revert "stmmac: Fix 'eth0: No PHY found' regression"

This reverts commit 88f8b1bb41c6208f81b6a480244533ded7b59493.
due to problems on GeekBox and Banana Pi M1 board when
connected to a real transceiver instead of a switch via
fixed-link.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Gabriel Fernandez <gabriel.fernandez@linaro.org>
Cc: Andreas Färber <afaerber@suse.de>
Cc: Frank Schäfer <fschaefer.oss@googlemail.com>
Cc: Dinh Nguyen <dinh.linux@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 11 insertions, 10 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index ea76129dafc2..af09ced53bd8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -199,12 +199,21 @@ int stmmac_mdio_register(struct net_device *ndev)
         struct stmmac_priv *priv = netdev_priv(ndev);
         struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
         int addr, found;
-        struct device_node *mdio_node = priv->plat->mdio_node;
+        struct device_node *mdio_node = NULL;
+        struct device_node *child_node = NULL;
 
         if (!mdio_bus_data)
                 return 0;
 
         if (IS_ENABLED(CONFIG_OF)) {
+                for_each_child_of_node(priv->device->of_node, child_node) {
+                        if (of_device_is_compatible(child_node,
+                                                    "snps,dwmac-mdio")) {
+                                mdio_node = child_node;
+                                break;
+                        }
+                }
+
                 if (mdio_node) {
                         netdev_dbg(ndev, "FOUND MDIO subnode\n");
                 } else {
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index dcbd2a1601e8..9cf181f839fd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -146,7 +146,6 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
         struct device_node *np = pdev->dev.of_node;
         struct plat_stmmacenet_data *plat;
         struct stmmac_dma_cfg *dma_cfg;
-        struct device_node *child_node = NULL;
 
         plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
         if (!plat)
@@ -177,19 +176,13 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
                 plat->phy_node = of_node_get(np);
         }
 
-        for_each_child_of_node(np, child_node)
-                if (of_device_is_compatible(child_node, "snps,dwmac-mdio")) {
-                        plat->mdio_node = child_node;
-                        break;
-                }
-
         /* "snps,phy-addr" is not a standard property. Mark it as deprecated
          * and warn of its use. Remove this when phy node support is added.
          */
         if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
                 dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
 
-        if ((plat->phy_node && !of_phy_is_fixed_link(np)) || !plat->mdio_node)
+        if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
                 plat->mdio_bus_data = NULL;
         else
                 plat->mdio_bus_data =
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 4bcf5a61aada..6e53fa8942a4 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -114,7 +114,6 @@ struct plat_stmmacenet_data {
         int interface;
         struct stmmac_mdio_bus_data *mdio_bus_data;
         struct device_node *phy_node;
-        struct device_node *mdio_node;
         struct stmmac_dma_cfg *dma_cfg;
         int clk_csr;
         int has_gmac;