[PATCH net-next 3/3] net: stmmac: dwmac-renesas-gbeth: add physical port identification
From: John Madieu <john.madieu.xa@bp.renesas.com>
Date: 2025-12-04 16:55:27
Also in:
linux-devicetree, linux-renesas-soc
Subsystem:
networking drivers, renesas rz/v2h(p) dwmac gbeth glue layer driver, stmmac ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Lad Prabhakar, Maxime Chevallier, Linus Torvalds
Implement ndo_get_phys_port_id() and ndo_get_phys_port_name() callbacks for the Renesas RZ/G3E GBETH driver. The port ID is an 8-byte identifier constructed from: - Permanent MAC address if available (addr_assign_type == NET_ADDR_PERM) - Renesas OUI (74:90:50) as fallback for random/generated MACs - Port index from 'port-id' DT property or ethernet alias The port name resolution follows this hierarchy: - 'port-name' DT property if specified (allows custom names like "mgmt") - "p<N>" format using 'port-id' DT property - "p<N>" format using ethernet alias index as fallback Signed-off-by: John Madieu <john.madieu.xa@bp.renesas.com> --- .../stmicro/stmmac/dwmac-renesas-gbeth.c | 56 +++++++++++++++++++ 1 file changed, 56 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
index bc7bb975803ca..5acb65b0e4f06 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c@@ -16,7 +16,9 @@ #include <linux/clk.h> #include <linux/device.h> #include <linux/module.h> +#include <linux/netdevice.h> #include <linux/of.h> +#include <linux/of_net.h> #include <linux/pcs-rzn1-miic.h> #include <linux/platform_device.h> #include <linux/reset.h>
@@ -91,6 +93,57 @@ static struct phylink_pcs *renesas_gmac_select_pcs(struct stmmac_priv *priv, return priv->hw->phylink_pcs; } +static int renesas_gbeth_get_port_id(struct device *dev) +{ + int port_id; + + if (!device_property_read_u32(dev, "renesas,port-id", &port_id)) + return port_id; + + port_id = of_alias_get_id(dev_of_node(dev), "ethernet"); + + return port_id < 0 ? 0 : port_id; +} + +static int renesas_gbeth_get_phys_port_name(struct net_device *ndev, + char *name, size_t len) +{ + struct stmmac_priv *priv = netdev_priv(ndev); + struct renesas_gbeth *gbeth = priv->plat->bsp_priv; + const char *port_name; + + if (!device_property_read_string(gbeth->dev, "renesas,port-name", &port_name)) + return snprintf(name, len, "%s", port_name) >= len ? -EINVAL : 0; + + return snprintf(name, len, "p%d", renesas_gbeth_get_port_id(gbeth->dev)) >= len ? -EINVAL : 0; +} + +static int renesas_gbeth_get_phys_port_id(struct net_device *ndev, + struct netdev_phys_item_id *ppid) +{ + struct stmmac_priv *priv = netdev_priv(ndev); + struct renesas_gbeth *gbeth = priv->plat->bsp_priv; + u8 *id = ppid->id; + + if (ndev->addr_assign_type == NET_ADDR_PERM) { + memcpy(id, ndev->perm_addr, ETH_ALEN); + } else { + /* Fallback: Renesas OUI prefix (74:90:50) */ + id[0] = 0x74; + id[1] = 0x90; + id[2] = 0x50; + id[3] = 0x00; + id[4] = 0x00; + id[5] = 0x00; + } + + id[6] = renesas_gbeth_get_port_id(gbeth->dev) & 0xff; + id[7] = 0x00; + ppid->id_len = 8; + + return 0; +} + static int renesas_gbeth_init(struct platform_device *pdev, void *priv) { struct plat_stmmacenet_data *plat_dat;
@@ -194,6 +247,9 @@ static int renesas_gbeth_probe(struct platform_device *pdev) plat_dat->select_pcs = renesas_gmac_select_pcs; } + plat_dat->get_phys_port_id = renesas_gbeth_get_phys_port_id; + plat_dat->get_phys_port_name = renesas_gbeth_get_phys_port_name; + return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res); }
--
2.25.1