diff --git a/Documentation/devicetree/bindings/net/rockchip-dwmac.txt b/Documentation/devicetree/bindings/net/rockchip-dwmac.txt
index 9c16ee2..3b71da7 100644
--- a/Documentation/devicetree/bindings/net/rockchip-dwmac.txt
+++ b/Documentation/devicetree/bindings/net/rockchip-dwmac.txt
@@ -4,6 +4,7 @@ The device node has following properties.
 
 Required properties:
  - compatible: should be "rockchip,<name>-gamc"
+   "rockchip,px30-gmac":   found on PX30 SoCs
    "rockchip,rk3128-gmac": found on RK312x SoCs
    "rockchip,rk3228-gmac": found on RK322x SoCs
    "rockchip,rk3288-gmac": found on RK3288 SoCs
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index f08625a..7b92336 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -61,6 +61,7 @@ struct rk_priv_data {
 	struct clk *mac_clk_tx;
 	struct clk *clk_mac_ref;
 	struct clk *clk_mac_refout;
+	struct clk *clk_mac_speed;
 	struct clk *aclk_mac;
 	struct clk *pclk_mac;
 	struct clk *clk_phy;
@@ -83,6 +84,64 @@ struct rk_priv_data {
 	(((tx) ? soc##_GMAC_TXCLK_DLY_ENABLE : soc##_GMAC_TXCLK_DLY_DISABLE) | \
 	 ((rx) ? soc##_GMAC_RXCLK_DLY_ENABLE : soc##_GMAC_RXCLK_DLY_DISABLE))
 
+#define PX30_GRF_GMAC_CON1		0x0904
+
+/* PX30_GRF_GMAC_CON1 */
+#define PX30_GMAC_PHY_INTF_SEL_RMII	(GRF_CLR_BIT(4) | GRF_CLR_BIT(5) | \
+					 GRF_BIT(6))
+#define PX30_GMAC_SPEED_10M		GRF_CLR_BIT(2)
+#define PX30_GMAC_SPEED_100M		GRF_BIT(2)
+
+static void px30_set_to_rmii(struct rk_priv_data *bsp_priv)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+
+	if (IS_ERR(bsp_priv->grf)) {
+		dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
+		return;
+	}
+
+	regmap_write(bsp_priv->grf, PX30_GRF_GMAC_CON1,
+		     PX30_GMAC_PHY_INTF_SEL_RMII);
+}
+
+static void px30_set_rmii_speed(struct rk_priv_data *bsp_priv, int speed)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+	int ret;
+
+	if (IS_ERR(bsp_priv->clk_mac_speed)) {
+		dev_err(dev, "%s: Missing clk_mac_speed clock\n", __func__);
+		return;
+	}
+
+	if (speed == 10) {
+		regmap_write(bsp_priv->grf, PX30_GRF_GMAC_CON1,
+			     PX30_GMAC_SPEED_10M);
+
+		ret = clk_set_rate(bsp_priv->clk_mac_speed, 2500000);
+		if (ret)
+			dev_err(dev, "%s: set clk_mac_speed rate 2500000 failed: %d\n",
+				__func__, ret);
+	} else if (speed == 100) {
+		regmap_write(bsp_priv->grf, PX30_GRF_GMAC_CON1,
+			     PX30_GMAC_SPEED_100M);
+
+		ret = clk_set_rate(bsp_priv->clk_mac_speed, 25000000);
+		if (ret)
+			dev_err(dev, "%s: set clk_mac_speed rate 25000000 failed: %d\n",
+				__func__, ret);
+
+	} else {
+		dev_err(dev, "unknown speed value for RMII! speed=%d", speed);
+	}
+}
+
+static const struct rk_gmac_ops px30_ops = {
+	.set_to_rmii = px30_set_to_rmii,
+	.set_rmii_speed = px30_set_rmii_speed,
+};
+
 #define RK3128_GRF_MAC_CON0	0x0168
 #define RK3128_GRF_MAC_CON1	0x016c
 
@@ -1042,6 +1101,10 @@ static int rk_gmac_clk_init(struct plat_stmmacenet_data *plat)
 		}
 	}
 
+	bsp_priv->clk_mac_speed = devm_clk_get(dev, "clk_mac_speed");
+	if (IS_ERR(bsp_priv->clk_mac_speed))
+		dev_err(dev, "cannot get clock %s\n", "clk_mac_speed");
+
 	if (bsp_priv->clock_input) {
 		dev_info(dev, "clock input from PHY\n");
 	} else {
@@ -1094,6 +1157,9 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
 			if (!IS_ERR(bsp_priv->mac_clk_tx))
 				clk_prepare_enable(bsp_priv->mac_clk_tx);
 
+			if (!IS_ERR(bsp_priv->clk_mac_speed))
+				clk_prepare_enable(bsp_priv->clk_mac_speed);
+
 			/**
 			 * if (!IS_ERR(bsp_priv->clk_mac))
 			 *	clk_prepare_enable(bsp_priv->clk_mac);
@@ -1118,6 +1184,8 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
 			clk_disable_unprepare(bsp_priv->pclk_mac);
 
 			clk_disable_unprepare(bsp_priv->mac_clk_tx);
+
+			clk_disable_unprepare(bsp_priv->clk_mac_speed);
 			/**
 			 * if (!IS_ERR(bsp_priv->clk_mac))
 			 *	clk_disable_unprepare(bsp_priv->clk_mac);
@@ -1414,6 +1482,7 @@ static int rk_gmac_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(rk_gmac_pm_ops, rk_gmac_suspend, rk_gmac_resume);
 
 static const struct of_device_id rk_gmac_dwmac_match[] = {
+	{ .compatible = "rockchip,px30-gmac",	.data = &px30_ops   },
 	{ .compatible = "rockchip,rk3128-gmac", .data = &rk3128_ops },
 	{ .compatible = "rockchip,rk3228-gmac", .data = &rk3228_ops },
 	{ .compatible = "rockchip,rk3288-gmac", .data = &rk3288_ops },
