netdev - [PATCH net-next 05/11] net: stmmac: add support for configuring the phy_intf

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Message-Id: <E1vFt4h-0000000Chos-3wxX@rmk-PC.armlinux.org.uk>
Date: Mon, 03 Nov 2025 11:50:15 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Fabio Estevam <festevam@...il.com>,
	imx@...ts.linux.dev,
	Jakub Kicinski <kuba@...nel.org>,
	Jan Petrous <jan.petrous@....nxp.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	s32@....com,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>
Subject: [PATCH net-next 05/11] net: stmmac: add support for configuring the
 phy_intf_sel inputs

When dwmac is synthesised with support for multiple PHY interfaces, the
core provides phy_intf_sel inputs, sampled on reset, to configure the
PHY facing interface. Use stmmac_get_phy_intf_sel() in core code to
determine the dwmac phy_intf_sel input value, and provide a new
platform method called with this value just before we issue a soft
reset to the dwmac core.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 34 +++++++++++++++++++
 include/linux/stmmac.h                        |  1 +
 2 files changed, 35 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 95d2cd020a0c..596995d2bec3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3102,6 +3102,36 @@ int stmmac_get_phy_intf_sel(phy_interface_t interface)
 }
 EXPORT_SYMBOL_GPL(stmmac_get_phy_intf_sel);
 
+static int stmmac_prereset_configure(struct stmmac_priv *priv)
+{
+	struct plat_stmmacenet_data *plat_dat = priv->plat;
+	phy_interface_t interface;
+	int phy_intf_sel, ret;
+
+	if (!plat_dat->set_phy_intf_sel)
+		return 0;
+
+	interface = plat_dat->phy_interface;
+	phy_intf_sel = stmmac_get_phy_intf_sel(interface);
+	if (phy_intf_sel < 0) {
+		netdev_err(priv->dev,
+			   "failed to get phy_intf_sel for %s: %pe\n",
+			   phy_modes(interface), ERR_PTR(phy_intf_sel));
+		return phy_intf_sel;
+	}
+
+	ret = plat_dat->set_phy_intf_sel(plat_dat->bsp_priv, phy_intf_sel);
+	if (ret == -EINVAL)
+		netdev_err(priv->dev, "platform does not support %s\n",
+			   phy_modes(interface));
+	else if (ret < 0)
+		netdev_err(priv->dev,
+			   "platform failed to set interface %s: %pe\n",
+			   phy_modes(interface), ERR_PTR(ret));
+
+	return ret;
+}
+
 /**
  * stmmac_init_dma_engine - DMA init.
  * @priv: driver private structure
@@ -3128,6 +3158,10 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 	if (priv->extend_desc && (priv->mode == STMMAC_RING_MODE))
 		priv->plat->dma_cfg->atds = 1;
 
+	ret = stmmac_prereset_configure(priv);
+	if (ret)
+		return ret;
+
 	ret = stmmac_reset(priv, priv->ioaddr);
 	if (ret) {
 		netdev_err(priv->dev, "Failed to reset the dma\n");
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 151c81c560c8..48e9f1d4e17e 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -250,6 +250,7 @@ struct plat_stmmacenet_data {
 	struct stmmac_txq_cfg tx_queues_cfg[MTL_MAX_TX_QUEUES];
 	void (*get_interfaces)(struct stmmac_priv *priv, void *bsp_priv,
 			       unsigned long *interfaces);
+	int (*set_phy_intf_sel)(void *priv, u8 phy_intf_sel);
 	int (*set_clk_tx_rate)(void *priv, struct clk *clk_tx_i,
 			       phy_interface_t interface, int speed);
 	void (*fix_mac_speed)(void *priv, int speed, unsigned int mode);
-- 
2.47.3