Merge branch 'net-ethernet-ti-am65-cpsw-nuss-support-stacked-switches'

Alexander Sverdlin says:

====================
net: ethernet: ti: am65-cpsw-nuss: support stacked switches

Currently an external Ethernet switch connected to a am65-cpsw-nuss CPU
port will not be probed successfully because of_find_net_device_by_node()
will not be able to find the netdev of the CPU port.

It's necessary to populate of_node of the struct device for the
am65-cpsw-nuss ports. DT nodes of the ports are already stored in per-port
private data, but because of some legacy reasons the naming ("phy_node")
was misleading.
====================

Link: https://lore.kernel.org/r/20240528075954.3608118-1-alexander.sverdlin@siemens.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/ti/am65-cpsw-nuss.c

@@ -896,7 +896,7 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
 	/* mac_sl should be configured via phy-link interface */
 	am65_cpsw_sl_ctl_reset(port);
 
-	ret = phylink_of_phy_connect(port->slave.phylink, port->slave.phy_node, 0);
+	ret = phylink_of_phy_connect(port->slave.phylink, port->slave.port_np, 0);
 	if (ret)
 		goto error_cleanup;
 
@@ -2611,7 +2611,7 @@ static int am65_cpsw_nuss_init_slave_ports(struct am65_cpsw_common *common)
 				of_property_read_bool(port_np, "ti,mac-only");
 
 		/* get phy/link info */
-		port->slave.phy_node = port_np;
+		port->slave.port_np = port_np;
 		ret = of_get_phy_mode(port_np, &port->slave.phy_if);
 		if (ret) {
 			dev_err(dev, "%pOF read phy-mode err %d\n",
@@ -2703,6 +2703,7 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
 	mutex_init(&ndev_priv->mm_lock);
 	port->qos.link_speed = SPEED_UNKNOWN;
 	SET_NETDEV_DEV(port->ndev, dev);
+	port->ndev->dev.of_node = port->slave.port_np;
 
 	eth_hw_addr_set(port->ndev, port->slave.mac_addr);
 
@@ -2760,7 +2761,7 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
 	}
 
 	phylink = phylink_create(&port->slave.phylink_config,
-				 of_node_to_fwnode(port->slave.phy_node),
+				 of_node_to_fwnode(port->slave.port_np),
 				 port->slave.phy_if,
 				 &am65_cpsw_phylink_mac_ops);
 	if (IS_ERR(phylink))

drivers/net/ethernet/ti/am65-cpsw-nuss.h

@@ -30,7 +30,7 @@ struct am65_cpts;
 struct am65_cpsw_slave_data {
 	bool				mac_only;
 	struct cpsw_sl			*mac_sl;
-	struct device_node		*phy_node;
+	struct device_node		*port_np;
 	phy_interface_t			phy_if;
 	struct phy			*ifphy;
 	struct phy			*serdes_phy;