regulator: Provide a selector based set_voltage_sel() operation

Many regulator drivers implement voltage setting by looping through a
table of possible values, normally because the set of available voltages
can't be mapped onto selectors with simple calcuation. Factor out these
loops by providing a variant of set_voltage() which takes a selector rather
than a voltage range as an argument and implementing a loop through the
available selectors in the core.

This is not going to be suitable for use with all devices as when the
regulator voltage can be mapped onto selector values with a simple
calculation the linear scan through the available values will be more
expensive than just doing the calculation, especially for regulators
that provide fine grained voltage control.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index bf3e653591b9..975ae06cb634 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -42,6 +42,8 @@ enum regulator_status {
  *
  * @set_voltage: Set the voltage for the regulator within the range specified.
  *               The driver should select the voltage closest to min_uV.
+ * @set_voltage_sel: Set the voltage for the regulator using the specified
+ *                   selector.
  * @get_voltage: Return the currently configured voltage for the regulator.
  * @get_voltage_sel: Return the currently configured voltage selector for the
  *                   regulator.
@@ -83,6 +85,7 @@ struct regulator_ops {
         /* get/set regulator voltage */
         int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV,
                             unsigned *selector);
+        int (*set_voltage_sel) (struct regulator_dev *, unsigned selector);
         int (*get_voltage) (struct regulator_dev *);
         int (*get_voltage_sel) (struct regulator_dev *);