netdev - [PATCH net-next 05/16] net: stmmac: mediatek: use stmmac_get_phy_intf

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Message-Id: <E1vHNRw-0000000DkSJ-2AQ2@rmk-PC.armlinux.org.uk>
Date: Fri, 07 Nov 2025 14:28:24 +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>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"David S. Miller" <davem@...emloft.net>,
	Emil Renner Berthing <kernel@...il.dk>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jerome Brunet <jbrunet@...libre.com>,
	Keguang Zhang <keguang.zhang@...il.com>,
	Kevin Hilman <khilman@...libre.com>,
	linux-amlogic@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	linux-mips@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Minda Chen <minda.chen@...rfivetech.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	netdev@...r.kernel.org,
	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.x90@...l.toshiba>,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next 05/16] net: stmmac: mediatek: use
 stmmac_get_phy_intf_sel()

Use stmmac_get_phy_intf_sel() to decode the PHY interface mode to the
phy_intf_sel value, validate the result, and pass that into the
implementation specific ->dwmac_set_phy_interface() method. Use this
to configure the PHY interface selection field.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 .../ethernet/stmicro/stmmac/dwmac-mediatek.c  | 43 +++++++++++--------
 1 file changed, 25 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
index dcdf28418fec..0f32732efb75 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
@@ -85,7 +85,8 @@ struct mediatek_dwmac_plat_data {
 };
 
 struct mediatek_dwmac_variant {
-	int (*dwmac_set_phy_interface)(struct mediatek_dwmac_plat_data *plat);
+	int (*dwmac_set_phy_interface)(struct mediatek_dwmac_plat_data *plat,
+				       u8 phy_intf_sel);
 	int (*dwmac_set_delay)(struct mediatek_dwmac_plat_data *plat);
 
 	/* clock ids to be requested */
@@ -106,25 +107,25 @@ static const char * const mt8195_dwmac_clk_l[] = {
 	"axi", "apb", "mac_cg", "mac_main", "ptp_ref"
 };
 
-static int mt2712_set_interface(struct mediatek_dwmac_plat_data *plat)
+static int mt2712_set_interface(struct mediatek_dwmac_plat_data *plat,
+				u8 phy_intf_sel)
 {
 	int rmii_clk_from_mac = plat->rmii_clk_from_mac ? RMII_CLK_SRC_INTERNAL : 0;
 	int rmii_rxc = plat->rmii_rxc ? RMII_CLK_SRC_RXC : 0;
-	u32 intf_val = 0;
+	u32 intf_val;
+
+	intf_val = phy_intf_sel;
 
 	/* select phy interface in top control domain */
 	switch (plat->phy_mode) {
-	case PHY_INTERFACE_MODE_MII:
-		intf_val |= PHY_INTF_SEL_GMII_MII;
-		break;
 	case PHY_INTERFACE_MODE_RMII:
-		intf_val |= PHY_INTF_SEL_RMII | rmii_rxc | rmii_clk_from_mac;
+		intf_val |= rmii_rxc | rmii_clk_from_mac;
 		break;
+	case PHY_INTERFACE_MODE_MII:
 	case PHY_INTERFACE_MODE_RGMII:
 	case PHY_INTERFACE_MODE_RGMII_TXID:
 	case PHY_INTERFACE_MODE_RGMII_RXID:
 	case PHY_INTERFACE_MODE_RGMII_ID:
-		intf_val |= PHY_INTF_SEL_RGMII;
 		break;
 	default:
 		dev_err(plat->dev, "phy interface not supported\n");
@@ -285,27 +286,25 @@ static const struct mediatek_dwmac_variant mt2712_gmac_variant = {
 		.tx_delay_max = 17600,
 };
 
-static int mt8195_set_interface(struct mediatek_dwmac_plat_data *plat)
+static int mt8195_set_interface(struct mediatek_dwmac_plat_data *plat,
+				u8 phy_intf_sel)
 {
 	int rmii_clk_from_mac = plat->rmii_clk_from_mac ? MT8195_RMII_CLK_SRC_INTERNAL : 0;
 	int rmii_rxc = plat->rmii_rxc ? MT8195_RMII_CLK_SRC_RXC : 0;
-	u32 intf_val = 0;
+	u32 intf_val;
+
+	intf_val = FIELD_PREP(MT8195_ETH_INTF_SEL, phy_intf_sel);
 
 	/* select phy interface in top control domain */
 	switch (plat->phy_mode) {
-	case PHY_INTERFACE_MODE_MII:
-		intf_val |= FIELD_PREP(MT8195_ETH_INTF_SEL,
-				       PHY_INTF_SEL_GMII_MII);
-		break;
 	case PHY_INTERFACE_MODE_RMII:
 		intf_val |= rmii_rxc | rmii_clk_from_mac;
-		intf_val |= FIELD_PREP(MT8195_ETH_INTF_SEL, PHY_INTF_SEL_RMII);
 		break;
+	case PHY_INTERFACE_MODE_MII:
 	case PHY_INTERFACE_MODE_RGMII:
 	case PHY_INTERFACE_MODE_RGMII_TXID:
 	case PHY_INTERFACE_MODE_RGMII_RXID:
 	case PHY_INTERFACE_MODE_RGMII_ID:
-		intf_val |= FIELD_PREP(MT8195_ETH_INTF_SEL, PHY_INTF_SEL_RGMII);
 		break;
 	default:
 		dev_err(plat->dev, "phy interface not supported\n");
@@ -525,10 +524,18 @@ static int mediatek_dwmac_init(struct device *dev, void *priv)
 {
 	struct mediatek_dwmac_plat_data *plat = priv;
 	const struct mediatek_dwmac_variant *variant = plat->variant;
-	int ret;
+	int phy_intf_sel, ret;
 
 	if (variant->dwmac_set_phy_interface) {
-		ret = variant->dwmac_set_phy_interface(plat);
+		phy_intf_sel = stmmac_get_phy_intf_sel(plat->phy_mode);
+		if (phy_intf_sel != PHY_INTF_SEL_GMII_MII &&
+		    phy_intf_sel != PHY_INTF_SEL_RGMII &&
+		    phy_intf_sel != PHY_INTF_SEL_RMII) {
+			dev_err(plat->dev, "phy interface not supported\n");
+			return phy_intf_sel < 0 ? phy_intf_sel : -EINVAL;
+		}
+
+		ret = variant->dwmac_set_phy_interface(plat, phy_intf_sel);
 		if (ret) {
 			dev_err(dev, "failed to set phy interface, err = %d\n", ret);
 			return ret;
-- 
2.47.3