linux-kernel - [PATCH] net: ethernet: ti: am65-cpsw-nuss: create platform device for port nodes

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Message-ID: <20240503200038.573669-1-hiagofranco@gmail.com>
Date: Fri,  3 May 2024 17:00:38 -0300
From: Hiago De Franco <hiagofranco@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Sean Anderson <sean.anderson@...ux.dev>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Hiago De Franco <hiago.franco@...adex.com>
Subject: [PATCH] net: ethernet: ti: am65-cpsw-nuss: create platform device for port nodes

From: Hiago De Franco <hiago.franco@...adex.com>

After this change, an 'of_node' link from '/sys/devices/platform' to
'/sys/firmware/devicetree' will be created. The 'ethernet-ports' device
allows multiple netdevs to have the exact same parent device, e.g. port@x
netdevs are child nodes of ethernet-ports.

When ethernet aliases are used (e.g. 'ethernet0 = &cpsw_port1' and
'ethernet1 = &cpsw_port2') in the device tree, without an of_node
device exposed to the userspace, it is not possible to determine where
exactly the alias is pointing to.

As an example, this is essential for applications like systemd, which rely
on the of_node information to identify and manage Ethernet devices
using device tree aliases introduced in the v251 naming scheme.

Signed-off-by: Hiago De Franco <hiago.franco@...adex.com>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 1d00e21808c1..f74915f56fa2 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2091,6 +2091,13 @@ static int am65_cpsw_nuss_init_slave_ports(struct am65_cpsw_common *common)
 		if (strcmp(port_np->name, "port"))
 			continue;

+		if (!of_platform_device_create(port_np, NULL, NULL)) {
+			dev_err(dev, "%pOF error creating port platform device\n",
+				port_np);
+			ret = -ENODEV;
+			goto of_node_put;
+		}
+
 		ret = of_property_read_u32(port_np, "reg", &port_id);
 		if (ret < 0) {
 			dev_err(dev, "%pOF error reading port_id %d\n",
-- 
2.43.0