regulator: palmas: Fix calcuating selector in palmas_map_voltage_smps

The logic of calculating selector in palmas_map_voltage_smps() does not match
the logic to list voltage in palmas_list_voltage_smps().

We use below equation to calculate voltage when selector > 0:
        voltage = (0.49V + (selector * 0.01V)) * RANGE
RANGE is either x1 or x2

So we need to take into account with the multiplier set in VSEL register when
calculating selector in palmas_map_voltage_smps()

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 14 insertions, 3 deletions

diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c
index 7540c95321ce..17d19fbbc490 100644
--- a/drivers/regulator/palmas-regulator.c
+++ b/drivers/regulator/palmas-regulator.c
@@ -373,11 +373,22 @@ static int palmas_set_voltage_smps_sel(struct regulator_dev *dev,
 static int palmas_map_voltage_smps(struct regulator_dev *rdev,
                 int min_uV, int max_uV)
 {
+        struct palmas_pmic *pmic = rdev_get_drvdata(rdev);
+        int id = rdev_get_id(rdev);
         int ret, voltage;
 
-        ret = ((min_uV - 500000) / 10000) + 1;
-        if (ret < 0)
-                return ret;
+        if (min_uV == 0)
+                return 0;
+
+        if (pmic->range[id]) { /* RANGE is x2 */
+                if (min_uV < 1000000)
+                        min_uV = 1000000;
+                ret = DIV_ROUND_UP(min_uV - 1000000, 20000) + 1;
+        } else {                /* RANGE is x1 */
+                if (min_uV < 500000)
+                        min_uV = 500000;
+                ret = DIV_ROUND_UP(min_uV - 500000, 10000) + 1;
+        }
 
         /* Map back into a voltage to verify we're still in bounds */
         voltage = palmas_list_voltage_smps(rdev, ret);