netdev - [PATCH net-next 09/21] net: stmmac: rk: convert rk3588 to rk_set_reg

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Message-Id: <E1vjEuV-00000005ggQ-2psl@rmk-PC.armlinux.org.uk>
Date: Fri, 23 Jan 2026 11:01:03 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>
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,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next 09/21] net: stmmac: rk: convert rk3588 to
 rk_set_reg_speed()

Update rk_set_reg_speed() to use either the grf or php_grf regmap
depending on the SoC's requirements and convert rk3588, removing
its custom code.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/dwmac-rk.c    | 63 ++++++++++---------
 1 file changed, 34 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 246a7b9205a5..4f32e4b3769c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -52,6 +52,7 @@ struct rk_gmac_ops {
 
 	u16 clock_grf_reg;
 
+	bool clock_grf_reg_in_php;
 	bool php_grf_required;
 	bool regs_valid;
 	u32 regs[];
@@ -132,7 +133,14 @@ static u32 rk_encode_wm16(u16 val, u16 mask)
 
 static int rk_write_clock_grf_reg(struct rk_priv_data *bsp_priv, u32 val)
 {
-	return regmap_write(bsp_priv->grf, bsp_priv->clock_grf_reg, val);
+	struct regmap *regmap;
+
+	if (bsp_priv->ops->clock_grf_reg_in_php)
+		regmap = bsp_priv->php_grf;
+	else
+		regmap = bsp_priv->grf;
+
+	return regmap_write(regmap, bsp_priv->clock_grf_reg, val);
 }
 
 static int rk_set_reg_speed(struct rk_priv_data *bsp_priv,
@@ -1325,39 +1333,33 @@ static void rk3588_set_to_rmii(struct rk_priv_data *bsp_priv)
 		     RK3588_GMAC_CLK_RMII_MODE(bsp_priv->id));
 }
 
+static const struct rk_reg_speed_data rk3588_gmac0_speed_data = {
+	.rgmii_10 = RK3588_GMAC_CLK_RGMII(0, GMAC_CLK_DIV50_2_5M),
+	.rgmii_100 = RK3588_GMAC_CLK_RGMII(0, GMAC_CLK_DIV5_25M),
+	.rgmii_1000 = RK3588_GMAC_CLK_RGMII(0, GMAC_CLK_DIV1_125M),
+	.rmii_10 = RK3588_GMA_CLK_RMII_DIV20(0),
+	.rmii_100 = RK3588_GMA_CLK_RMII_DIV2(0),
+};
+
+static const struct rk_reg_speed_data rk3588_gmac1_speed_data = {
+	.rgmii_10 = RK3588_GMAC_CLK_RGMII(1, GMAC_CLK_DIV50_2_5M),
+	.rgmii_100 = RK3588_GMAC_CLK_RGMII(1, GMAC_CLK_DIV5_25M),
+	.rgmii_1000 = RK3588_GMAC_CLK_RGMII(1, GMAC_CLK_DIV1_125M),
+	.rmii_10 = RK3588_GMA_CLK_RMII_DIV20(1),
+	.rmii_100 = RK3588_GMA_CLK_RMII_DIV2(1),
+};
+
 static int rk3588_set_gmac_speed(struct rk_priv_data *bsp_priv,
 				 phy_interface_t interface, int speed)
 {
-	unsigned int val = 0, id = bsp_priv->id;
-
-	switch (speed) {
-	case 10:
-		if (interface == PHY_INTERFACE_MODE_RMII)
-			val = RK3588_GMA_CLK_RMII_DIV20(id);
-		else
-			val = RK3588_GMAC_CLK_RGMII(id, GMAC_CLK_DIV50_2_5M);
-		break;
-	case 100:
-		if (interface == PHY_INTERFACE_MODE_RMII)
-			val = RK3588_GMA_CLK_RMII_DIV2(id);
-		else
-			val = RK3588_GMAC_CLK_RGMII(id, GMAC_CLK_DIV5_25M);
-		break;
-	case 1000:
-		if (interface != PHY_INTERFACE_MODE_RMII)
-			val = RK3588_GMAC_CLK_RGMII(id, GMAC_CLK_DIV1_125M);
-		else
-			goto err;
-		break;
-	default:
-		goto err;
-	}
+	const struct rk_reg_speed_data *rsd;
 
-	regmap_write(bsp_priv->php_grf, RK3588_GRF_CLK_CON1, val);
+	if (bsp_priv->id == 0)
+		rsd = &rk3588_gmac0_speed_data;
+	else
+		rsd = &rk3588_gmac1_speed_data;
 
-	return 0;
-err:
-	return -EINVAL;
+	return rk_set_reg_speed(bsp_priv, rsd, interface, speed);
 }
 
 static void rk3588_set_clock_selection(struct rk_priv_data *bsp_priv, bool input,
@@ -1381,6 +1383,9 @@ static const struct rk_gmac_ops rk3588_ops = {
 
 	.gmac_grf_reg = RK3588_GRF_GMAC_CON0,
 
+	.clock_grf_reg_in_php = true,
+	.clock_grf_reg = RK3588_GRF_CLK_CON1,
+
 	.php_grf_required = true,
 	.regs_valid = true,
 	.regs = {
-- 
2.47.3