diff --git a/drivers/net/mdio/mdio-realtek-rtl9300.c b/drivers/net/mdio/mdio-realtek-rtl9300.c
index 94f59a56bc46..c992f09835f9 100644
--- a/drivers/net/mdio/mdio-realtek-rtl9300.c
+++ b/drivers/net/mdio/mdio-realtek-rtl9300.c
@@ -71,7 +71,7 @@
 #define SMI_ACCESS_PHY_CTRL_2		0xcb78
 #define   PHY_CTRL_INDATA		GENMASK(31, 16)
 #define   PHY_CTRL_DATA			GENMASK(15, 0)
-#define SMI_ACCESS_PHY_CTRL_3		0xcb7c
+#define RTL9300_SMI_ACCESS_PHY_CTRL_3	0xcb7c
 #define   PHY_CTRL_MMD_DEVAD		GENMASK(20, 16)
 #define   PHY_CTRL_MMD_REG		GENMASK(15, 0)
 #define SMI_PORT0_5_ADDR_CTRL		0xcb80
@@ -81,7 +81,13 @@
 #define MAX_SMI_ADDR	0x1f
 #define RAW_PAGE(priv)	((priv)->info->num_pages - 1)
 
+
+struct otto_emdio_cmd_regs {
+	u32 c45_data;
+};
+
 struct otto_emdio_info {
+	struct otto_emdio_cmd_regs cmd_regs;
 	u8 num_buses;
 	u8 num_ports;
 	u16 num_pages;
@@ -262,7 +268,7 @@ static int otto_emdio_9300_read_c45(struct mii_bus *bus, int phy_id, int dev_add
 
 	val = FIELD_PREP(PHY_CTRL_MMD_DEVAD, dev_addr) |
 	      FIELD_PREP(PHY_CTRL_MMD_REG, regnum);
-	err = regmap_write(regmap, SMI_ACCESS_PHY_CTRL_3, val);
+	err = regmap_write(regmap, priv->info->cmd_regs.c45_data, val);
 	if (err)
 		goto out_err;
 
@@ -320,7 +326,7 @@ static int otto_emdio_9300_write_c45(struct mii_bus *bus, int phy_id, int dev_ad
 
 	val = FIELD_PREP(PHY_CTRL_MMD_DEVAD, dev_addr) |
 	      FIELD_PREP(PHY_CTRL_MMD_REG, regnum);
-	err = regmap_write(regmap, SMI_ACCESS_PHY_CTRL_3, val);
+	err = regmap_write(regmap, priv->info->cmd_regs.c45_data, val);
 	if (err)
 		goto out_err;
 
@@ -541,6 +547,9 @@ static int otto_emdio_probe(struct platform_device *pdev)
 }
 
 static const struct otto_emdio_info otto_emdio_9300_info = {
+	.cmd_regs = {
+		.c45_data = RTL9300_SMI_ACCESS_PHY_CTRL_3,
+	},
 	.num_buses = RTL9300_NUM_BUSES,
 	.num_ports = RTL9300_NUM_PORTS,
 	.num_pages = RTL9300_NUM_PAGES,