net: dsa: introduce a .port_probe() method in struct dsa_ops

Some drivers might want to execute code for each port at probe time, as
opposed to executing code just-in-time for the port selected for
networking.

To cater to that use case, introduce a .port_probe() callback method
into the DSA switch operations which is called for each available port,
at the end of dsa_port_probe().

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Tested-by: Michael Walle <michael@walle.cc>
diff --git a/net/dsa-uclass.c b/net/dsa-uclass.c
index dbd8558..9b8ae1e 100644
--- a/net/dsa-uclass.c
+++ b/net/dsa-uclass.c
@@ -270,6 +270,7 @@
 static int dsa_port_probe(struct udevice *pdev)
 {
 	struct udevice *dev = dev_get_parent(pdev);
+	struct dsa_ops *ops = dsa_get_ops(dev);
 	struct dsa_port_pdata *port_pdata;
 	struct dsa_priv *dsa_priv;
 	struct udevice *master;
@@ -299,6 +300,13 @@
 
 	dsa_port_set_hwaddr(pdev, master);
 
+	if (ops->port_probe) {
+		err = ops->port_probe(dev, port_pdata->index,
+				      port_pdata->phy);
+		if (err)
+			return err;
+	}
+
 	return 0;
 }