net: ethernet: ti: cpsw: Assign OF node to slave devices

Assign OF node to CPSW slave devices, otherwise it is not possible to
bind e.g. DSA switch to them. Without this patch, the DSA code tries
to find the ethernet device by OF match, but fails to do so because
the slave device has NULL OF node.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw.c

@@ -2179,6 +2179,7 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
 			return ret;
 		}
 
+		slave_data->slave_node = slave_node;
 		slave_data->phy_node = of_parse_phandle(slave_node,
 							"phy-handle", 0);
 		parp = of_get_property(slave_node, "phy_id", &lenp);
@@ -2330,6 +2331,7 @@ static int cpsw_probe_dual_emac(struct cpsw_priv *priv)
 
 	/* register the network device */
 	SET_NETDEV_DEV(ndev, cpsw->dev);
+	ndev->dev.of_node = cpsw->slaves[1].data->slave_node;
 	ret = register_netdev(ndev);
 	if (ret)
 		dev_err(cpsw->dev, "cpsw: error registering net device\n");
@@ -2507,6 +2509,7 @@ static int cpsw_probe(struct platform_device *pdev)
 
 	/* register the network device */
 	SET_NETDEV_DEV(ndev, dev);
+	ndev->dev.of_node = cpsw->slaves[0].data->slave_node;
 	ret = register_netdev(ndev);
 	if (ret) {
 		dev_err(dev, "error registering net device\n");

drivers/net/ethernet/ti/cpsw_priv.h

@@ -272,6 +272,7 @@ struct cpsw_host_regs {
 };
 
 struct cpsw_slave_data {
+	struct device_node *slave_node;
 	struct device_node *phy_node;
 	char		phy_id[MII_BUS_ID_SIZE];
 	int		phy_if;