.linear_min_sel         = _lmin,                \
        }
 
-int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
+static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
 {
        unsigned int val;
        int ret;
        return val & BD9571MWV_AVS_SET_MONI_MASK;
 }
 
-int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
-                                        unsigned int sel)
+static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
+                                               unsigned int sel)
 {
        int ret;
 
                                 rdev->desc->vsel_mask, sel);
 }
 
-int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
+static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
 {
        unsigned int val;
        int ret;
        return val;
 }
 
-int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
-                                        unsigned int sel)
+static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
+                                               unsigned int sel)
 {
        return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
                                 rdev->desc->vsel_mask, sel);