net: stmmac: Fix case when PHY handle is not present

Some DT bindings do not have the PHY handle. Let's fallback to manually
discovery in case phylink_of_phy_connect() fails.

Changes from v1:
	- Fixup comment style (Sergei)

Fixes: 7437127 ("net: stmmac: Convert to phylink and remove phylib logic")
Reported-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
Tested-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -953,9 +953,13 @@ static int stmmac_init_phy(struct net_device *dev)
 
 	node = priv->plat->phylink_node;
 
-	if (node) {
+	if (node)
 		ret = phylink_of_phy_connect(priv->phylink, node, 0);
-	} else {
+
+	/* Some DT bindings do not set-up the PHY handle. Let's try to
+	 * manually parse it
+	 */
+	if (!node || ret) {
 		int addr = priv->plat->phy_addr;
 		struct phy_device *phydev;