+	/* Make sure the firmware of the embedded GPHY is loaded before,
+	 * otherwise they will not be detectable on the MDIO bus.
+	 */
+	of_for_each_phandle(&it, err, np, "lantiq,phys", NULL, 0) {
+		phy_np = it.node;
+		if (phy_np) {
+			struct platform_device *phy = of_find_device_by_node(phy_np);
+
+			of_node_put(phy_np);
+			if (!platform_get_drvdata(phy))
+				return -EPROBE_DEFER;
+		}
+	}

Is there a device tree binding document for this somewhere?

   Andrew