regulator: Use list_voltage() to get voltage in regulator_set_voltage_time_sel

With this change, regulator_set_voltage_time_sel() can be more generic and not
limited to linear and table based mapping now.
One side-effect of this change is that list_voltage() must be implemented.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 26b71048709b2b64480afebb6f52053e203c7429..e3597ab09be34f8440058dfbc16d42d6071b322d 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2296,8 +2296,7 @@ EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
  * Provided with the starting and target voltage selectors, this function
  * returns time in microseconds required to rise or fall to this new voltage
  *
- * Drivers providing uV_step or volt_table in their regulator_desc and
- * ramp_delay in regulation_constraints can use this as their
+ * Drivers providing ramp_delay in regulation_constraints can use this as their
  * set_voltage_time_sel() operation.
  */
 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
@@ -2305,6 +2304,7 @@ int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
                                   unsigned int new_selector)
 {
        unsigned int ramp_delay = 0;
+       int old_volt, new_volt;
 
        if (rdev->constraints->ramp_delay)
                ramp_delay = rdev->constraints->ramp_delay;
@@ -2316,19 +2316,14 @@ int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
                return 0;
        }
 
-       if (rdev->desc->uV_step) {
-               return DIV_ROUND_UP(rdev->desc->uV_step *
-                                   abs(new_selector - old_selector),
-                                   ramp_delay);
-       } else if (rdev->desc->volt_table) {
-               return DIV_ROUND_UP(abs(rdev->desc->volt_table[new_selector] -
-                                       rdev->desc->volt_table[old_selector]),
-                                   ramp_delay);
-       } else {
-               rdev_warn(rdev, "Unsupported voltage mapping settings\n");
-       }
+       /* sanity check */
+       if (!rdev->desc->ops->list_voltage)
+               return -EINVAL;
 
-       return 0;
+       old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
+       new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
+
+       return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
 }
 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);