return vsel;
 }
 
-static struct regulator_ops twl4030ldo_ops = {
+static const struct regulator_ops twl4030ldo_ops = {
        .list_voltage   = twl4030ldo_list_voltage,
 
        .set_voltage_sel = twl4030ldo_set_voltage_sel,
        return vsel * 12500 + 600000;
 }
 
-static struct regulator_ops twl4030smps_ops = {
+static const struct regulator_ops twl4030smps_ops = {
        .set_voltage    = twl4030smps_set_voltage,
        .get_voltage    = twl4030smps_get_voltage,
 };
 
 /*----------------------------------------------------------------------*/
 
-static struct regulator_ops twl4030fixed_ops = {
+static const struct regulator_ops twl4030fixed_ops = {
        .list_voltage   = regulator_list_voltage_linear,
 
        .enable         = twl4030reg_enable,