regulator: Report actual configured voltage to set_voltage()

Change the interface used by set_voltage() to report the selected value
to the regulator core in terms of a selector used by list_voltage().
This allows the regulator core to know the voltage that was chosen
without having to do an explict get_voltage(), which would be much more
expensive as it will generally access hardware.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

27 files changed, 202 insertions, 79 deletions

diff --git a/drivers/regulator/88pm8607.c b/drivers/regulator/88pm8607.c
index 2ce2eb71d0f5..dd6308499bd4 100644
--- a/drivers/regulator/88pm8607.c
+++ b/drivers/regulator/88pm8607.c
@@ -249,7 +249,7 @@ static int choose_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
 }
 
 static int pm8607_set_voltage(struct regulator_dev *rdev,
-                              int min_uV, int max_uV)
+                              int min_uV, int max_uV, unsigned *selector)
 {
         struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
         uint8_t val, mask;
@@ -263,6 +263,7 @@ static int pm8607_set_voltage(struct regulator_dev *rdev,
         ret = choose_voltage(rdev, min_uV, max_uV);
         if (ret < 0)
                 return -EINVAL;
+        *selector = ret;
         val = (uint8_t)(ret << info->vol_shift);
         mask = ((1 << info->vol_nbits) - 1)  << info->vol_shift;
 
diff --git a/drivers/regulator/ab3100.c b/drivers/regulator/ab3100.c
index b349266a43de..ed6feaf9398d 100644
--- a/drivers/regulator/ab3100.c
+++ b/drivers/regulator/ab3100.c
@@ -362,7 +362,8 @@ static int ab3100_get_best_voltage_index(struct regulator_dev *reg,
 }
 
 static int ab3100_set_voltage_regulator(struct regulator_dev *reg,
-                                        int min_uV, int max_uV)
+                                        int min_uV, int max_uV,
+                                        unsigned *selector)
 {
         struct ab3100_regulator *abreg = reg->reg_data;
         u8 regval;
@@ -373,6 +374,8 @@ static int ab3100_set_voltage_regulator(struct regulator_dev *reg,
         if (bestindex < 0)
                 return bestindex;
 
+        *selector = bestindex;
+
         err = abx500_get_register_interruptible(abreg->dev, 0,
                                                 abreg->regreg, &regval);
         if (err) {
diff --git a/drivers/regulator/ab8500.c b/drivers/regulator/ab8500.c
index db6b70f20511..2f4ec0facef1 100644
--- a/drivers/regulator/ab8500.c
+++ b/drivers/regulator/ab8500.c
@@ -215,7 +215,8 @@ static int ab8500_get_best_voltage_index(struct regulator_dev *rdev,
 }
 
 static int ab8500_regulator_set_voltage(struct regulator_dev *rdev,
-                int min_uV, int max_uV)
+                                        int min_uV, int max_uV,
+                                        unsigned *selector)
 {
         int regulator_id, ret;
         struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
@@ -232,6 +233,8 @@ static int ab8500_regulator_set_voltage(struct regulator_dev *rdev,
                 return ret;
         }
 
+        *selector = ret;
+
         /* set the registers for the request */
         ret = abx500_mask_and_set_register_interruptible(info->dev,
                 info->voltage_bank, info->voltage_reg,
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 81336e23848a..67d3a61f3785 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -723,13 +723,16 @@ static int machine_constraints_voltage(struct regulator_dev *rdev,
         struct regulator_ops *ops = rdev->desc->ops;
         const char *name = rdev_get_name(rdev);
         int ret;
+        unsigned selector;
 
         /* do we need to apply the constraint voltage */
         if (rdev->constraints->apply_uV &&
                 rdev->constraints->min_uV == rdev->constraints->max_uV &&
                 ops->set_voltage) {
                 ret = ops->set_voltage(rdev,
-                        rdev->constraints->min_uV, rdev->constraints->max_uV);
+                                       rdev->constraints->min_uV,
+                                       rdev->constraints->max_uV,
+                                       &selector);
                         if (ret < 0) {
                                 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
                                        __func__,
@@ -1625,6 +1628,7 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
 {
         struct regulator_dev *rdev = regulator->rdev;
         int ret;
+        unsigned selector;
 
         mutex_lock(&rdev->mutex);
 
@@ -1640,7 +1644,13 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
                 goto out;
         regulator->min_uV = min_uV;
         regulator->max_uV = max_uV;
-        ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
+
+        ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, &selector);
+
+        if (rdev->desc->ops->list_voltage)
+                selector = rdev->desc->ops->list_voltage(rdev, selector);
+        else
+                selector = -1;
 
 out:
         _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
diff --git a/drivers/regulator/da903x.c b/drivers/regulator/da903x.c
index f8c4661a7a81..362e08221085 100644
--- a/drivers/regulator/da903x.c
+++ b/drivers/regulator/da903x.c
@@ -107,7 +107,7 @@ static inline int check_range(struct da903x_regulator_info *info,
 
 /* DA9030/DA9034 common operations */
 static int da903x_set_ldo_voltage(struct regulator_dev *rdev,
-                                  int min_uV, int max_uV)
+                                  int min_uV, int max_uV, unsigned *selector)
 {
         struct da903x_regulator_info *info = rdev_get_drvdata(rdev);
         struct device *da9034_dev = to_da903x_dev(rdev);
@@ -119,6 +119,7 @@ static int da903x_set_ldo_voltage(struct regulator_dev *rdev,
         }
 
         val = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
+        *selector = val;
         val <<= info->vol_shift;
         mask = ((1 << info->vol_nbits) - 1)  << info->vol_shift;
 
@@ -187,7 +188,8 @@ static int da903x_list_voltage(struct regulator_dev *rdev, unsigned selector)
 
 /* DA9030 specific operations */
 static int da9030_set_ldo1_15_voltage(struct regulator_dev *rdev,
-                                       int min_uV, int max_uV)
+                                      int min_uV, int max_uV,
+                                      unsigned *selector)
 {
         struct da903x_regulator_info *info = rdev_get_drvdata(rdev);
         struct device *da903x_dev = to_da903x_dev(rdev);
@@ -200,6 +202,7 @@ static int da9030_set_ldo1_15_voltage(struct regulator_dev *rdev,
         }
 
         val = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
+        *selector = val;
         val <<= info->vol_shift;
         mask = ((1 << info->vol_nbits) - 1)  << info->vol_shift;
         val |= DA9030_LDO_UNLOCK; /* have to set UNLOCK bits */
@@ -214,7 +217,8 @@ static int da9030_set_ldo1_15_voltage(struct regulator_dev *rdev,
 }
 
 static int da9030_set_ldo14_voltage(struct regulator_dev *rdev,
-                                  int min_uV, int max_uV)
+                                    int min_uV, int max_uV,
+                                    unsigned *selector)
 {
         struct da903x_regulator_info *info = rdev_get_drvdata(rdev);
         struct device *da903x_dev = to_da903x_dev(rdev);
@@ -234,6 +238,7 @@ static int da9030_set_ldo14_voltage(struct regulator_dev *rdev,
                 val = (min_uV - thresh + info->step_uV - 1) / info->step_uV;
         }
 
+        *selector = val;
         val <<= info->vol_shift;
         mask = ((1 << info->vol_nbits) - 1)  << info->vol_shift;
 
@@ -263,7 +268,7 @@ static int da9030_get_ldo14_voltage(struct regulator_dev *rdev)
 
 /* DA9034 specific operations */
 static int da9034_set_dvc_voltage(struct regulator_dev *rdev,
-                                  int min_uV, int max_uV)
+                                  int min_uV, int max_uV, unsigned *selector)
 {
         struct da903x_regulator_info *info = rdev_get_drvdata(rdev);
         struct device *da9034_dev = to_da903x_dev(rdev);
@@ -276,6 +281,7 @@ static int da9034_set_dvc_voltage(struct regulator_dev *rdev,
         }
 
         val = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
+        *selector = val;
         val <<= info->vol_shift;
         mask = ((1 << info->vol_nbits) - 1)  << info->vol_shift;
 
@@ -289,7 +295,7 @@ static int da9034_set_dvc_voltage(struct regulator_dev *rdev,
 }
 
 static int da9034_set_ldo12_voltage(struct regulator_dev *rdev,
-                                    int min_uV, int max_uV)
+                                    int min_uV, int max_uV, unsigned *selector)
 {
         struct da903x_regulator_info *info = rdev_get_drvdata(rdev);
         struct device *da9034_dev = to_da903x_dev(rdev);
@@ -302,6 +308,7 @@ static int da9034_set_ldo12_voltage(struct regulator_dev *rdev,
 
         val = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
         val = (val >= 20) ? val - 12 : ((val > 7) ? 8 : val);
+        *selector = val;
         val <<= info->vol_shift;
         mask = ((1 << info->vol_nbits) - 1)  << info->vol_shift;
 
diff --git a/drivers/regulator/isl6271a-regulator.c b/drivers/regulator/isl6271a-regulator.c
index b8cc6389a541..b5639e82fcc7 100644
--- a/drivers/regulator/isl6271a-regulator.c
+++ b/drivers/regulator/isl6271a-regulator.c
@@ -58,7 +58,9 @@ out:
         return data;
 }
 
-static int isl6271a_set_voltage(struct regulator_dev *dev, int minuV, int maxuV)
+static int isl6271a_set_voltage(struct regulator_dev *dev,
+                                int minuV, int maxuV,
+                                unsigned *selector)
 {
         struct isl_pmic *pmic = rdev_get_drvdata(dev);
         int vsel, err, data;
@@ -78,6 +80,8 @@ static int isl6271a_set_voltage(struct regulator_dev *dev, int minuV, int maxuV)
         /* Convert the microvolts to data for the chip */
         data = (vsel - ISL6271A_VOLTAGE_MIN) / ISL6271A_VOLTAGE_STEP;
 
+        *selector = data;
+
         mutex_lock(&pmic->mtx);
 
         err = i2c_smbus_write_byte(pmic->client, data);
diff --git a/drivers/regulator/lp3971.c b/drivers/regulator/lp3971.c
index 3bb82b624e19..0f22ef12601c 100644
--- a/drivers/regulator/lp3971.c
+++ b/drivers/regulator/lp3971.c
@@ -168,7 +168,8 @@ static int lp3971_ldo_get_voltage(struct regulator_dev *dev)
 }
 
 static int lp3971_ldo_set_voltage(struct regulator_dev *dev,
-                                  int min_uV, int max_uV)
+                                  int min_uV, int max_uV,
+                                  unsigned int *selector)
 {
         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
         int ldo = rdev_get_id(dev) - LP3971_LDO1;
@@ -187,6 +188,8 @@ static int lp3971_ldo_set_voltage(struct regulator_dev *dev,
         if (val > LDO_VOL_MAX_IDX || vol_map[val] > max_vol)
                 return -EINVAL;
 
+        *selector = val;
+
         return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
                         LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
                         val << LDO_VOL_CONTR_SHIFT(ldo));
@@ -256,7 +259,8 @@ static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
 }
 
 static int lp3971_dcdc_set_voltage(struct regulator_dev *dev,
-                                  int min_uV, int max_uV)
+                                   int min_uV, int max_uV,
+                                   unsigned int *selector)
 {
         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
         int buck = rdev_get_id(dev) - LP3971_DCDC1;
@@ -277,6 +281,8 @@ static int lp3971_dcdc_set_voltage(struct regulator_dev *dev,
         if (val > BUCK_TARGET_VOL_MAX_IDX || vol_map[val] > max_vol)
                 return -EINVAL;
 
+        *selector = val;
+
         ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
                BUCK_TARGET_VOL_MASK, val);
         if (ret)
diff --git a/drivers/regulator/lp3972.c b/drivers/regulator/lp3972.c
index e07062fd0b42..6aa1b506fb5d 100644
--- a/drivers/regulator/lp3972.c
+++ b/drivers/regulator/lp3972.c
@@ -292,7 +292,8 @@ static int lp3972_ldo_get_voltage(struct regulator_dev *dev)
 }
 
 static int lp3972_ldo_set_voltage(struct regulator_dev *dev,
-                                  int min_uV, int max_uV)
+                                  int min_uV, int max_uV,
+                                  unsigned int *selector)
 {
         struct lp3972 *lp3972 = rdev_get_drvdata(dev);
         int ldo = rdev_get_id(dev) - LP3972_LDO1;
@@ -313,6 +314,8 @@ static int lp3972_ldo_set_voltage(struct regulator_dev *dev,
         if (val > LP3972_LDO_VOL_MAX_IDX(ldo) || vol_map[val] > max_vol)
                 return -EINVAL;
 
+        *selector = val;
+
         shift = LP3972_LDO_VOL_CONTR_SHIFT(ldo);
         ret = lp3972_set_bits(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo),
                 LP3972_LDO_VOL_MASK(ldo) << shift, val << shift);
@@ -416,7 +419,8 @@ static int lp3972_dcdc_get_voltage(struct regulator_dev *dev)
 }
 
 static int lp3972_dcdc_set_voltage(struct regulator_dev *dev,
-                                  int min_uV, int max_uV)
+                                   int min_uV, int max_uV,
+                                   unsigned int *selector)
 {
         struct lp3972 *lp3972 = rdev_get_drvdata(dev);
         int buck = rdev_get_id(dev) - LP3972_DCDC1;
@@ -438,6 +442,8 @@ static int lp3972_dcdc_set_voltage(struct regulator_dev *dev,
             vol_map[val] > max_vol)
                 return -EINVAL;
 
+        *selector = val;
+
         ret = lp3972_set_bits(lp3972, LP3972_BUCK_VOL1_REG(buck),
                                 LP3972_BUCK_VOL_MASK, val);
         if (ret)
diff --git a/drivers/regulator/max1586.c b/drivers/regulator/max1586.c
index 559cfa271a44..3f49512c5134 100644
--- a/drivers/regulator/max1586.c
+++ b/drivers/regulator/max1586.c
@@ -63,12 +63,12 @@ static int max1586_v3_calc_voltage(struct max1586_data *max1586,
         return max1586->min_uV + (selector * range_uV / MAX1586_V3_MAX_VSEL);
 }
 
-static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV)
+static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV,
+                          unsigned *selector)
 {
         struct max1586_data *max1586 = rdev_get_drvdata(rdev);
         struct i2c_client *client = max1586->client;
         unsigned range_uV = max1586->max_uV - max1586->min_uV;
-        unsigned selector;
         u8 v3_prog;
 
         if (min_uV > max1586->max_uV || max_uV < max1586->min_uV)
@@ -76,15 +76,15 @@ static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV)
         if (min_uV < max1586->min_uV)
                 min_uV = max1586->min_uV;
 
-        selector = ((min_uV - max1586->min_uV) * MAX1586_V3_MAX_VSEL +
+        *selector = ((min_uV - max1586->min_uV) * MAX1586_V3_MAX_VSEL +
                         range_uV - 1) / range_uV;
-        if (max1586_v3_calc_voltage(max1586, selector) > max_uV)
+        if (max1586_v3_calc_voltage(max1586, *selector) > max_uV)
                 return -EINVAL;
 
         dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
-                max1586_v3_calc_voltage(max1586, selector) / 1000);
+                max1586_v3_calc_voltage(max1586, *selector) / 1000);
 
-        v3_prog = I2C_V3_SELECT | (u8) selector;
+        v3_prog = I2C_V3_SELECT | (u8) *selector;
         return i2c_smbus_write_byte(client, v3_prog);
 }
 
@@ -110,10 +110,10 @@ static int max1586_v6_calc_voltage(unsigned selector)
         return voltages_uv[selector];
 }
 
-static int max1586_v6_set(struct regulator_dev *rdev, int min_uV, int max_uV)
+static int max1586_v6_set(struct regulator_dev *rdev, int min_uV, int max_uV,
+                          unsigned int *selector)
 {
         struct i2c_client *client = rdev_get_drvdata(rdev);
-        unsigned selector;
         u8 v6_prog;
 
         if (min_uV < MAX1586_V6_MIN_UV || min_uV > MAX1586_V6_MAX_UV)
@@ -122,21 +122,21 @@ static int max1586_v6_set(struct regulator_dev *rdev, int min_uV, int max_uV)
                 return -EINVAL;
 
         if (min_uV < 1800000)
-                selector = 0;
+                *selector = 0;
         else if (min_uV < 2500000)
-                selector = 1;
+                *selector = 1;
         else if (min_uV < 3000000)
-                selector = 2;
+                *selector = 2;
         else if (min_uV >= 3000000)
-                selector = 3;
+                *selector = 3;
 
-        if (max1586_v6_calc_voltage(selector) > max_uV)
+        if (max1586_v6_calc_voltage(*selector) > max_uV)
                 return -EINVAL;
 
         dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
-                max1586_v6_calc_voltage(selector) / 1000);
+                max1586_v6_calc_voltage(*selector) / 1000);
 
-        v6_prog = I2C_V6_SELECT | (u8) selector;
+        v6_prog = I2C_V6_SELECT | (u8) *selector;
         return i2c_smbus_write_byte(client, v6_prog);
 }
 
diff --git a/drivers/regulator/max8649.c b/drivers/regulator/max8649.c
index 6b60a9c0366b..30eb9e54f7ec 100644
--- a/drivers/regulator/max8649.c
+++ b/drivers/regulator/max8649.c
@@ -155,7 +155,7 @@ static int max8649_get_voltage(struct regulator_dev *rdev)
 }
 
 static int max8649_set_voltage(struct regulator_dev *rdev,
-                               int min_uV, int max_uV)
+                               int min_uV, int max_uV, unsigned *selector)
 {
         struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
         unsigned char data, mask;
@@ -168,6 +168,7 @@ static int max8649_set_voltage(struct regulator_dev *rdev,
         data = (min_uV - MAX8649_DCDC_VMIN + MAX8649_DCDC_STEP - 1)
                 / MAX8649_DCDC_STEP;
         mask = MAX8649_VOL_MASK;
+        *selector = data & mask;
 
         return max8649_set_bits(info->i2c, info->vol_reg, mask, data);
 }
diff --git a/drivers/regulator/max8660.c b/drivers/regulator/max8660.c
index c570e6eb0db2..33f5d9a492ef 100644
--- a/drivers/regulator/max8660.c
+++ b/drivers/regulator/max8660.c
@@ -141,7 +141,8 @@ static int max8660_dcdc_get(struct regulator_dev *rdev)
         return MAX8660_DCDC_MIN_UV + selector * MAX8660_DCDC_STEP;
 }
 
-static int max8660_dcdc_set(struct regulator_dev *rdev, int min_uV, int max_uV)
+static int max8660_dcdc_set(struct regulator_dev *rdev, int min_uV, int max_uV,
+                            unsigned int *s)
 {
         struct max8660 *max8660 = rdev_get_drvdata(rdev);
         u8 reg, selector, bits;
@@ -154,6 +155,7 @@ static int max8660_dcdc_set(struct regulator_dev *rdev, int min_uV, int max_uV)
 
         selector = (min_uV - (MAX8660_DCDC_MIN_UV - MAX8660_DCDC_STEP + 1))
                         / MAX8660_DCDC_STEP;
+        *s = selector;
 
         ret = max8660_dcdc_list(rdev, selector);
         if (ret < 0 || ret > max_uV)
@@ -196,7 +198,8 @@ static int max8660_ldo5_get(struct regulator_dev *rdev)
         return MAX8660_LDO5_MIN_UV + selector * MAX8660_LDO5_STEP;
 }
 
-static int max8660_ldo5_set(struct regulator_dev *rdev, int min_uV, int max_uV)
+static int max8660_ldo5_set(struct regulator_dev *rdev, int min_uV, int max_uV,
+                            unsigned int *s)
 {
         struct max8660 *max8660 = rdev_get_drvdata(rdev);
         u8 selector;
@@ -213,6 +216,8 @@ static int max8660_ldo5_set(struct regulator_dev *rdev, int min_uV, int max_uV)
         if (ret < 0 || ret > max_uV)
                 return -EINVAL;
 
+        *s = selector;
+
         ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
         if (ret)
                 return ret;
@@ -270,7 +275,8 @@ static int max8660_ldo67_get(struct regulator_dev *rdev)
         return MAX8660_LDO67_MIN_UV + selector * MAX8660_LDO67_STEP;
 }
 
-static int max8660_ldo67_set(struct regulator_dev *rdev, int min_uV, int max_uV)
+static int max8660_ldo67_set(struct regulator_dev *rdev, int min_uV,
+                             int max_uV, unsigned int *s)
 {
         struct max8660 *max8660 = rdev_get_drvdata(rdev);
         u8 selector;
@@ -288,6 +294,8 @@ static int max8660_ldo67_set(struct regulator_dev *rdev, int min_uV, int max_uV)
         if (ret < 0 || ret > max_uV)
                 return -EINVAL;
 
+        *s = selector;
+
         if (rdev_get_id(rdev) == MAX8660_V6)
                 return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
         else
diff --git a/drivers/regulator/max8925-regulator.c b/drivers/regulator/max8925-regulator.c
index 552cad85ae5a..8ae147549c6a 100644
--- a/drivers/regulator/max8925-regulator.c
+++ b/drivers/regulator/max8925-regulator.c
@@ -55,7 +55,7 @@ static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
 }
 
 static int max8925_set_voltage(struct regulator_dev *rdev,
-                               int min_uV, int max_uV)
+                               int min_uV, int max_uV, unsigned int *selector)
 {
         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
         unsigned char data, mask;
@@ -66,6 +66,7 @@ static int max8925_set_voltage(struct regulator_dev *rdev,
                 return -EINVAL;
         }
         data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
+        *selector = data;
         data <<= info->vol_shift;
         mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
 
diff --git a/drivers/regulator/max8952.c b/drivers/regulator/max8952.c
index 0d5dda4fd911..a8f4ecfb0843 100644
--- a/drivers/regulator/max8952.c
+++ b/drivers/regulator/max8952.c
@@ -133,7 +133,7 @@ static int max8952_get_voltage(struct regulator_dev *rdev)
 }
 
 static int max8952_set_voltage(struct regulator_dev *rdev,
-                                int min_uV, int max_uV)
+                               int min_uV, int max_uV, unsigned *selector)
 {
         struct max8952_data *max8952 = rdev_get_drvdata(rdev);
         s8 vid = -1, i;
@@ -156,6 +156,7 @@ static int max8952_set_voltage(struct regulator_dev *rdev,
         if (vid >= 0 && vid < MAX8952_NUM_DVS_MODE) {
                 max8952->vid0 = (vid % 2 == 1);
                 max8952->vid1 = (((vid >> 1) % 2) == 1);
+                *selector = vid;
                 gpio_set_value(max8952->pdata->gpio_vid0, max8952->vid0);
                 gpio_set_value(max8952->pdata->gpio_vid1, max8952->vid1);
         } else
diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c
index 5c20756db607..cb28cf8b9397 100644
--- a/drivers/regulator/max8998.c
+++ b/drivers/regulator/max8998.c
@@ -304,7 +304,7 @@ static int max8998_get_voltage(struct regulator_dev *rdev)
 }
 
 static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
-                                int min_uV, int max_uV)
+                                   int min_uV, int max_uV, unsigned *selector)
 {
         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
         struct i2c_client *i2c = max8998->iodev->i2c;
@@ -331,6 +331,8 @@ static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
         if (desc->min + desc->step*i > max_vol)
                 return -EINVAL;
 
+        *selector = i;
+
         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
         if (ret)
                 return ret;
@@ -352,7 +354,7 @@ static inline void buck2_gpio_set(int gpio, int v)
 }
 
 static int max8998_set_voltage_buck(struct regulator_dev *rdev,
-                                    int min_uV, int max_uV)
+                                    int min_uV, int max_uV, int *selector)
 {
         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
         struct max8998_platform_data *pdata =
@@ -384,6 +386,8 @@ static int max8998_set_voltage_buck(struct regulator_dev *rdev,
         if (desc->min + desc->step*i > max_vol)
                 return -EINVAL;
 
+        *selector = i;
+
         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
         if (ret)
                 return ret;
diff --git a/drivers/regulator/mc13783-regulator.c b/drivers/regulator/mc13783-regulator.c
index ecd99f59dba8..47ea99949798 100644
--- a/drivers/regulator/mc13783-regulator.c
+++ b/drivers/regulator/mc13783-regulator.c
@@ -373,7 +373,8 @@ static int mc13783_get_best_voltage_index(struct regulator_dev *rdev,
 }
 
 static int mc13783_regulator_set_voltage(struct regulator_dev *rdev,
-                                                int min_uV, int max_uV)
+                                         int min_uV, int max_uV,
+                                         unsigned *selector)
 {
         struct mc13783_regulator_priv *priv = rdev_get_drvdata(rdev);
         int value, id = rdev_get_id(rdev);
@@ -388,6 +389,8 @@ static int mc13783_regulator_set_voltage(struct regulator_dev *rdev,
         if (value < 0)
                 return value;
 
+        *selector = value;
+
         mc13783_lock(priv->mc13783);
         ret = mc13783_reg_rmw(priv->mc13783, mc13783_regulators[id].vsel_reg,
                         mc13783_regulators[id].vsel_mask,
@@ -433,13 +436,16 @@ static struct regulator_ops mc13783_regulator_ops = {
 };
 
 static int mc13783_fixed_regulator_set_voltage(struct regulator_dev *rdev,
-                                                int min_uV, int max_uV)
+                                               int min_uV, int max_uV,
+                                               unsigned int *selector)
 {
         int id = rdev_get_id(rdev);
 
         dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
                 __func__, id, min_uV, max_uV);
 
+        *selector = 0;
+
         if (min_uV >= mc13783_regulators[id].voltages[0] &&
             max_uV <= mc13783_regulators[id].voltages[0])
                 return 0;
diff --git a/drivers/regulator/pcap-regulator.c b/drivers/regulator/pcap-regulator.c
index 29d0566379ae..8dca11694f75 100644
--- a/drivers/regulator/pcap-regulator.c
+++ b/drivers/regulator/pcap-regulator.c
@@ -151,7 +151,8 @@ static struct pcap_regulator vreg_table[] = {
 };
 
 static int pcap_regulator_set_voltage(struct regulator_dev *rdev,
-                                                int min_uV, int max_uV)
+                                      int min_uV, int max_uV,
+                                      unsiged *selector)
 {
         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
         void *pcap = rdev_get_drvdata(rdev);
@@ -170,10 +171,12 @@ static int pcap_regulator_set_voltage(struct regulator_dev *rdev,
                         i = 0;
 
                 uV = vreg->voltage_table[i] * 1000;
-                if (min_uV <= uV && uV <= max_uV)
+                if (min_uV <= uV && uV <= max_uV) {
+                        *selector = i;
                         return ezx_pcap_set_bits(pcap, vreg->reg,
                                         (vreg->n_voltages - 1) << vreg->index,
                                         i << vreg->index);
+                }
 
                 if (i == 0 && rdev_get_id(rdev) == V1)
                         i = vreg->n_voltages - 1;
diff --git a/drivers/regulator/pcf50633-regulator.c b/drivers/regulator/pcf50633-regulator.c
index c8f41dc05b76..69a11d9dd87f 100644
--- a/drivers/regulator/pcf50633-regulator.c
+++ b/drivers/regulator/pcf50633-regulator.c
@@ -108,7 +108,8 @@ static unsigned int ldo_voltage_value(u8 bits)
 }
 
 static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
-                                                int min_uV, int max_uV)
+                                          int min_uV, int max_uV,
+                                          unsigned *selector)
 {
         struct pcf50633 *pcf;
         int regulator_id, millivolts;
@@ -147,6 +148,8 @@ static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
                 return -EINVAL;
         }
 
+        *selector = volt_bits;
+
         return pcf50633_reg_write(pcf, regnr, volt_bits);
 }
 
diff --git a/drivers/regulator/tps65023-regulator.c b/drivers/regulator/tps65023-regulator.c
index cd6d4fc9d74f..60a7ca5409e9 100644
--- a/drivers/regulator/tps65023-regulator.c
+++ b/drivers/regulator/tps65023-regulator.c
@@ -321,7 +321,8 @@ static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
 }
 
 static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
-                                int min_uV, int max_uV)
+                                     int min_uV, int max_uV,
+                                     unsigned *selector)
 {
         struct tps_pmic *tps = rdev_get_drvdata(dev);
         int dcdc = rdev_get_id(dev);
@@ -346,6 +347,8 @@ static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
                         break;
         }
 
+        *selector = vsel;
+
         /* write to the register in case we found a match */
         if (vsel == tps->info[dcdc]->table_len)
                 return -EINVAL;
@@ -371,7 +374,7 @@ static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
 }
 
 static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
-                                int min_uV, int max_uV)
+                                    int min_uV, int max_uV, unsigned *selector)
 {
         struct tps_pmic *tps = rdev_get_drvdata(dev);
         int data, vsel, ldo = rdev_get_id(dev);
@@ -396,6 +399,8 @@ static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
         if (vsel == tps->info[ldo]->table_len)
                 return -EINVAL;
 
+        *selector = vsel;
+
         data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
         if (data < 0)
                 return data;
diff --git a/drivers/regulator/tps6507x-regulator.c b/drivers/regulator/tps6507x-regulator.c
index 020f5878d7ff..064755290599 100644
--- a/drivers/regulator/tps6507x-regulator.c
+++ b/drivers/regulator/tps6507x-regulator.c
@@ -369,7 +369,8 @@ static int tps6507x_pmic_dcdc_get_voltage(struct regulator_dev *dev)
 }
 
 static int tps6507x_pmic_dcdc_set_voltage(struct regulator_dev *dev,
-                                int min_uV, int max_uV)
+                                          int min_uV, int max_uV,
+                                          unsigned *selector)
 {
         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
         int data, vsel, dcdc = rdev_get_id(dev);
@@ -415,6 +416,8 @@ static int tps6507x_pmic_dcdc_set_voltage(struct regulator_dev *dev,
         if (vsel == tps->info[dcdc]->table_len)
                 return -EINVAL;
 
+        *selector = vsel;
+
         data = tps6507x_pmic_reg_read(tps, reg);
         if (data < 0)
                 return data;
@@ -450,7 +453,8 @@ static int tps6507x_pmic_ldo_get_voltage(struct regulator_dev *dev)
 }
 
 static int tps6507x_pmic_ldo_set_voltage(struct regulator_dev *dev,
-                                int min_uV, int max_uV)
+                                         int min_uV, int max_uV,
+                                         unsigned *selector)
 {
         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
         int data, vsel, ldo = rdev_get_id(dev);
@@ -483,6 +487,8 @@ static int tps6507x_pmic_ldo_set_voltage(struct regulator_dev *dev,
         if (vsel == tps->info[ldo]->table_len)
                 return -EINVAL;
 
+        *selector = vsel;
+
         data = tps6507x_pmic_reg_read(tps, reg);
         if (data < 0)
                 return data;
diff --git a/drivers/regulator/tps6586x-regulator.c b/drivers/regulator/tps6586x-regulator.c
index 6d20b0454a1d..bb04a75a4c98 100644
--- a/drivers/regulator/tps6586x-regulator.c
+++ b/drivers/regulator/tps6586x-regulator.c
@@ -85,7 +85,8 @@ static int tps6586x_ldo_list_voltage(struct regulator_dev *rdev,
 
 static int __tps6586x_ldo_set_voltage(struct device *parent,
                                       struct tps6586x_regulator *ri,
-                                      int min_uV, int max_uV)
+                                      int min_uV, int max_uV,
+                                      unsigned *selector)
 {
         int val, uV;
         uint8_t mask;
@@ -100,6 +101,8 @@ static int __tps6586x_ldo_set_voltage(struct device *parent,
                 /* use the first in-range value */
                 if (min_uV <= uV && uV <= max_uV) {
 
+                        *selector = val;
+
                         val <<= ri->volt_shift;
                         mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
 
@@ -111,12 +114,13 @@ static int __tps6586x_ldo_set_voltage(struct device *parent,
 }
 
 static int tps6586x_ldo_set_voltage(struct regulator_dev *rdev,
-                                    int min_uV, int max_uV)
+                                    int min_uV, int max_uV, unsigned *selector)
 {
         struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
         struct device *parent = to_tps6586x_dev(rdev);
 
-        return __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV);
+        return __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV,
+                                          selector);
 }
 
 static int tps6586x_ldo_get_voltage(struct regulator_dev *rdev)
@@ -140,13 +144,14 @@ static int tps6586x_ldo_get_voltage(struct regulator_dev *rdev)
 }
 
 static int tps6586x_dvm_set_voltage(struct regulator_dev *rdev,
-                                    int min_uV, int max_uV)
+                                    int min_uV, int max_uV, unsigned *selector)
 {
         struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
         struct device *parent = to_tps6586x_dev(rdev);
         int ret;
 
-        ret = __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV);
+        ret = __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV,
+                                         selector);
         if (ret)
                 return ret;
 
diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c
index a57262a4fa6c..bd332cf1cc3f 100644
--- a/drivers/regulator/twl-regulator.c
+++ b/drivers/regulator/twl-regulator.c
@@ -329,7 +329,8 @@ static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 }
 
 static int
-twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
+twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
+                       unsigned *selector)
 {
         struct twlreg_info      *info = rdev_get_drvdata(rdev);
         int                     vsel;
@@ -345,9 +346,11 @@ twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
                 /* REVISIT for VAUX2, first match may not be best/lowest */
 
                 /* use the first in-range value */
-                if (min_uV <= uV && uV <= max_uV)
+                if (min_uV <= uV && uV <= max_uV) {
+                        *selector = vsel;
                         return twlreg_write(info, TWL_MODULE_PM_RECEIVER,
                                                         VREG_VOLTAGE, vsel);
+                }
         }
 
         return -EDOM;
@@ -389,7 +392,8 @@ static int twl6030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 }
 
 static int
-twl6030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
+twl6030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
+                       unsigned *selector)
 {
         struct twlreg_info      *info = rdev_get_drvdata(rdev);
         int                     vsel;
@@ -402,6 +406,7 @@ twl6030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
          * mV = 1000mv + 100mv * (vsel - 1)
          */
         vsel = (min_uV/1000 - 1000)/100 + 1;
+        *selector = vsel;
         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE, vsel);
 
 }
diff --git a/drivers/regulator/wm831x-dcdc.c b/drivers/regulator/wm831x-dcdc.c
index dbfaf5945e48..71da6b2ad863 100644
--- a/drivers/regulator/wm831x-dcdc.c
+++ b/drivers/regulator/wm831x-dcdc.c
@@ -302,7 +302,7 @@ static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
 }
 
 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
-                                    int min_uV, int max_uV)
+                                    int min_uV, int max_uV, unsigned *selector)
 {
         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
         struct wm831x *wm831x = dcdc->wm831x;
@@ -314,6 +314,8 @@ static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
         if (vsel < 0)
                 return vsel;
 
+        *selector = vsel;
+
         /* If this value is already set then do a GPIO update if we can */
         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
                 return wm831x_buckv_set_dvs(rdev, 0);
@@ -636,7 +638,7 @@ static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 }
 
 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
-                                        int min_uV, int max_uV)
+                                        int min_uV, int max_uV, int *selector)
 {
         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
         struct wm831x *wm831x = dcdc->wm831x;
@@ -650,16 +652,20 @@ static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
                 return -EINVAL;
 
+        *selector = vsel;
+
         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 }
 
 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
-                                    int min_uV, int max_uV)
+                                    int min_uV, int max_uV,
+                                    unsigned *selector)
 {
         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 
-        return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV);
+        return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
+                                            selector);
 }
 
 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
@@ -667,8 +673,9 @@ static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 {
         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
+        unsigned selector;
 
-        return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV);
+        return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
 }
 
 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)
diff --git a/drivers/regulator/wm831x-ldo.c b/drivers/regulator/wm831x-ldo.c
index 9edf8f692341..9594e7161b4d 100644
--- a/drivers/regulator/wm831x-ldo.c
+++ b/drivers/regulator/wm831x-ldo.c
@@ -113,7 +113,8 @@ static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev,
 }
 
 static int wm831x_gp_ldo_set_voltage_int(struct regulator_dev *rdev, int reg,
-                                         int min_uV, int max_uV)
+                                         int min_uV, int max_uV,
+                                         unsigned *selector)
 {
         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
         struct wm831x *wm831x = ldo->wm831x;
@@ -133,16 +134,20 @@ static int wm831x_gp_ldo_set_voltage_int(struct regulator_dev *rdev, int reg,
         if (ret < min_uV || ret > max_uV)
                 return -EINVAL;
 
+        *selector = vsel;
+
         return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, vsel);
 }
 
 static int wm831x_gp_ldo_set_voltage(struct regulator_dev *rdev,
-                                     int min_uV, int max_uV)
+                                     int min_uV, int max_uV,
+                                     unsigned *selector)
 {
         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 
-        return wm831x_gp_ldo_set_voltage_int(rdev, reg, min_uV, max_uV);
+        return wm831x_gp_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
+                                             selector);
 }
 
 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
@@ -150,8 +155,9 @@ static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 {
         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
         int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
+        unsigned int selector;
 
-        return wm831x_gp_ldo_set_voltage_int(rdev, reg, uV, uV);
+        return wm831x_gp_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 }
 
 static int wm831x_gp_ldo_get_voltage(struct regulator_dev *rdev)
@@ -413,7 +419,8 @@ static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
 }
 
 static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
-                                         int min_uV, int max_uV)
+                                       int min_uV, int max_uV,
+                                       unsigned *selector)
 {
         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
         struct wm831x *wm831x = ldo->wm831x;
@@ -433,16 +440,19 @@ static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
         if (ret < min_uV || ret > max_uV)
                 return -EINVAL;
 
+        *selector = vsel;
+
         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
 }
 
 static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,
-                                     int min_uV, int max_uV)
+                                   int min_uV, int max_uV, unsigned *selector)
 {
         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 
-        return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV);
+        return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
+                                           selector);
 }
 
 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
@@ -450,8 +460,9 @@ static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
 {
         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
         int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
+        unsigned int selector;
 
-        return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV);
+        return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 }
 
 static int wm831x_aldo_get_voltage(struct regulator_dev *rdev)
@@ -666,7 +677,8 @@ static int wm831x_alive_ldo_list_voltage(struct regulator_dev *rdev,
 
 static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
                                             int reg,
-                                            int min_uV, int max_uV)
+                                            int min_uV, int max_uV,
+                                            unsigned *selector)
 {
         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
         struct wm831x *wm831x = ldo->wm831x;
@@ -680,16 +692,20 @@ static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
         if (ret < min_uV || ret > max_uV)
                 return -EINVAL;
 
+        *selector = vsel;
+
         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
 }
 
 static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,
-                                     int min_uV, int max_uV)
+                                        int min_uV, int max_uV,
+                                        unsigned *selector)
 {
         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 
-        return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV);
+        return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
+                                                selector);
 }
 
 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
@@ -697,8 +713,9 @@ static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 {
         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
         int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
+        unsigned selector;
 
-        return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV);
+        return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 }
 
 static int wm831x_alive_ldo_get_voltage(struct regulator_dev *rdev)
diff --git a/drivers/regulator/wm8350-regulator.c b/drivers/regulator/wm8350-regulator.c
index fe4b8a8a9dfd..7e45b0ddd710 100644
--- a/drivers/regulator/wm8350-regulator.c
+++ b/drivers/regulator/wm8350-regulator.c
@@ -360,7 +360,7 @@ int wm8350_isink_set_flash(struct wm8350 *wm8350, int isink, u16 mode,
 EXPORT_SYMBOL_GPL(wm8350_isink_set_flash);
 
 static int wm8350_dcdc_set_voltage(struct regulator_dev *rdev, int min_uV,
-        int max_uV)
+                                   int max_uV, unsigned *selector)
 {
         struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
         int volt_reg, dcdc = rdev_get_id(rdev), mV,
@@ -397,6 +397,8 @@ static int wm8350_dcdc_set_voltage(struct regulator_dev *rdev, int min_uV,
                 return -EINVAL;
         }
 
+        *selector = mV;
+
         /* all DCDCs have same mV bits */
         val = wm8350_reg_read(wm8350, volt_reg) & ~WM8350_DC1_VSEL_MASK;
         wm8350_reg_write(wm8350, volt_reg, val | mV);
@@ -754,7 +756,7 @@ static int wm8350_ldo_set_suspend_disable(struct regulator_dev *rdev)
 }
 
 static int wm8350_ldo_set_voltage(struct regulator_dev *rdev, int min_uV,
-        int max_uV)
+                                  int max_uV, unsigned *selector)
 {
         struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
         int volt_reg, ldo = rdev_get_id(rdev), mV, min_mV = min_uV / 1000,
@@ -797,6 +799,8 @@ static int wm8350_ldo_set_voltage(struct regulator_dev *rdev, int min_uV,
                 return -EINVAL;
         }
 
+        *selector = mV;
+
         /* all LDOs have same mV bits */
         val = wm8350_reg_read(wm8350, volt_reg) & ~WM8350_LDO1_VSEL_MASK;
         wm8350_reg_write(wm8350, volt_reg, val | mV);
diff --git a/drivers/regulator/wm8400-regulator.c b/drivers/regulator/wm8400-regulator.c
index 924c7eb29ee9..b42d01cef35a 100644
--- a/drivers/regulator/wm8400-regulator.c
+++ b/drivers/regulator/wm8400-regulator.c
@@ -67,7 +67,7 @@ static int wm8400_ldo_get_voltage(struct regulator_dev *dev)
 }
 
 static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
-                                  int min_uV, int max_uV)
+                                  int min_uV, int max_uV, unsigned *selector)
 {
         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
         u16 val;
@@ -93,6 +93,8 @@ static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
                 val += 0xf;
         }
 
+        *selector = val;
+
         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
                                WM8400_LDO1_VSEL_MASK, val);
 }
@@ -156,7 +158,7 @@ static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
 }
 
 static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
-                                  int min_uV, int max_uV)
+                                   int min_uV, int max_uV, unsigned *selector)
 {
         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
         u16 val;
@@ -171,6 +173,8 @@ static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
                 return -EINVAL;
         BUG_ON(850000 + (25000 * val) < min_uV);
 
+        *selector = val;
+
         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
                                WM8400_DC1_VSEL_MASK, val);
 }
diff --git a/drivers/regulator/wm8994-regulator.c b/drivers/regulator/wm8994-regulator.c
index 03713bc66e4a..1b162e699368 100644
--- a/drivers/regulator/wm8994-regulator.c
+++ b/drivers/regulator/wm8994-regulator.c
@@ -101,7 +101,7 @@ static int wm8994_ldo1_get_voltage(struct regulator_dev *rdev)
 }
 
 static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
-                                   int min_uV, int max_uV)
+                                   int min_uV, int max_uV, unsigned *s)
 {
         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
         int selector, v;
@@ -111,6 +111,7 @@ static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
         if (v < 0 || v > max_uV)
                 return -EINVAL;
 
+        *s = selector;
         selector <<= WM8994_LDO1_VSEL_SHIFT;
 
         return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
@@ -152,7 +153,7 @@ static int wm8994_ldo2_get_voltage(struct regulator_dev *rdev)
 }
 
 static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
-                                   int min_uV, int max_uV)
+                                   int min_uV, int max_uV, unsigned *s)
 {
         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
         int selector, v;
@@ -162,6 +163,7 @@ static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
         if (v < 0 || v > max_uV)
                 return -EINVAL;
 
+        *s = selector;
         selector <<= WM8994_LDO2_VSEL_SHIFT;
 
         return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 592cd7c642c2..4275cd475eac 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -79,7 +79,8 @@ struct regulator_ops {
         int (*list_voltage) (struct regulator_dev *, unsigned selector);
 
         /* get/set regulator voltage */
-        int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV);
+        int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV,
+                            unsigned *selector);
         int (*get_voltage) (struct regulator_dev *);
 
         /* get/set regulator current  */