struct platform_device *pdev;
        int phy_iface;
        struct regulator *regulator;
-       struct rk_gmac_ops *ops;
+       const struct rk_gmac_ops *ops;
 
        bool clk_enabled;
        bool clock_input;
        }
 }
 
-struct rk_gmac_ops rk3288_ops = {
+static const struct rk_gmac_ops rk3288_ops = {
        .set_to_rgmii = rk3288_set_to_rgmii,
        .set_to_rmii = rk3288_set_to_rmii,
        .set_rgmii_speed = rk3288_set_rgmii_speed,
        }
 }
 
-struct rk_gmac_ops rk3368_ops = {
+static const struct rk_gmac_ops rk3368_ops = {
        .set_to_rgmii = rk3368_set_to_rgmii,
        .set_to_rmii = rk3368_set_to_rmii,
        .set_rgmii_speed = rk3368_set_rgmii_speed,
 }
 
 static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev,
-                                         struct rk_gmac_ops *ops)
+                                         const struct rk_gmac_ops *ops)
 {
        struct rk_priv_data *bsp_priv;
        struct device *dev = &pdev->dev;