netdev - [PATCH RFC net-next 02/15] net: stmmac: rk: convert rk3328 to use bsp

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Message-Id: <E1vQ5Eq-0000000GNva-3OiR@rmk-PC.armlinux.org.uk>
Date: Mon, 01 Dec 2025 14:50:52 +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>,
	Heiko Stuebner <heiko@...ech.de>,
	Jakub Kicinski <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH RFC net-next 02/15] net: stmmac: rk: convert rk3328 to use
 bsp_priv->id

rk3328 contains two GMAC instances - gmac2io and gmac2phy. The gmac2io
instance can be connected to an external PHY, whereas gmac2phy is
connected via RMII to an on-SoC integrated PHY. This configuration can
not be changed.

The driver tests for the gmac2phy instance by checking
bsp_priv->integrated_phy (determined from the PHY's phy-is-integrated
property) and sometimes that the interface mode is RMII. This works
because the rk3328.dtsi has:

        gmac2phy: ethernet@...50000 {
                compatible = "rockchip,rk3328-gmac";
                phy-mode = "rmii";

                mdio {
                        phy: ethernet-phy@0 {
                                phy-is-integrated;
                        };
                };
        };

The driver contains a mechanism to look up the MMIO address in a table
to determine bsp_priv->id, which is used for every other Rockchip
device. Switch rk3328 to use this mechanism to determine bsp_priv->id
and use that to select which GRF register is used for configuration.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 3679081047e0..f9bc9b145ff4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -566,8 +566,7 @@ static void rk3328_set_to_rmii(struct rk_priv_data *bsp_priv)
 {
 	unsigned int reg;
 
-	reg = bsp_priv->integrated_phy ? RK3328_GRF_MAC_CON2 :
-		  RK3328_GRF_MAC_CON1;
+	reg = bsp_priv->id ? RK3328_GRF_MAC_CON2 : RK3328_GRF_MAC_CON1;
 
 	regmap_write(bsp_priv->grf, reg,
 		     RK3328_GMAC_PHY_INTF_SEL(PHY_INTF_SEL_RMII) |
@@ -587,10 +586,7 @@ static int rk3328_set_speed(struct rk_priv_data *bsp_priv,
 {
 	unsigned int reg;
 
-	if (interface == PHY_INTERFACE_MODE_RMII && bsp_priv->integrated_phy)
-		reg = RK3328_GRF_MAC_CON2;
-	else
-		reg = RK3328_GRF_MAC_CON1;
+	reg = bsp_priv->id ? RK3328_GRF_MAC_CON2 : RK3328_GRF_MAC_CON1;
 
 	return rk_set_reg_speed(bsp_priv, &rk3328_reg_speed_data, reg,
 				interface, speed);
@@ -610,6 +606,13 @@ static const struct rk_gmac_ops rk3328_ops = {
 	.set_speed = rk3328_set_speed,
 	.integrated_phy_powerup = rk3328_integrated_phy_powerup,
 	.integrated_phy_powerdown = rk_gmac_integrated_ephy_powerdown,
+
+	.regs_valid = true,
+	.regs = {
+		0xff540000, /* gmac2io */
+		0xff550000, /* gmac2phy */
+		0, /* sentinel */
+	},
 };
 
 #define RK3366_GRF_SOC_CON6	0x0418
-- 
2.47.3