regulator: provide consumer interface for fall/rise time

This exposes the functionality for rise/fall fime when setting
voltage to the consumers.

Cc: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e7e4460..3ffc697 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1765,6 +1765,51 @@ out:
 EXPORT_SYMBOL_GPL(regulator_set_voltage);
 
 /**
+ * regulator_set_voltage_time - get raise/fall time
+ * @regulator: regulator source
+ * @old_uV: starting voltage in microvolts
+ * @new_uV: target voltage in microvolts
+ *
+ * Provided with the starting and ending voltage, this function attempts to
+ * calculate the time in microseconds required to rise or fall to this new
+ * voltage.
+ */
+int regulator_set_voltage_time(struct regulator *regulator,
+                              int old_uV, int new_uV)
+{
+       struct regulator_dev    *rdev = regulator->rdev;
+       struct regulator_ops    *ops = rdev->desc->ops;
+       int old_sel = -1;
+       int new_sel = -1;
+       int voltage;
+       int i;
+
+       /* Currently requires operations to do this */
+       if (!ops->list_voltage || !ops->set_voltage_time_sel
+           || !rdev->desc->n_voltages)
+               return -EINVAL;
+
+       for (i = 0; i < rdev->desc->n_voltages; i++) {
+               /* We only look for exact voltage matches here */
+               voltage = regulator_list_voltage(regulator, i);
+               if (voltage < 0)
+                       return -EINVAL;
+               if (voltage == 0)
+                       continue;
+               if (voltage == old_uV)
+                       old_sel = i;
+               if (voltage == new_uV)
+                       new_sel = i;
+       }
+
+       if (old_sel < 0 || new_sel < 0)
+               return -EINVAL;
+
+       return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
+}
+EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
+
+/**
  * regulator_sync_voltage - re-apply last regulator output voltage
  * @regulator: regulator source
  *

diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 7954f6b..9e87c1c 100644 (file)
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -153,6 +153,8 @@ int regulator_list_voltage(struct regulator *regulator, unsigned selector);
 int regulator_is_supported_voltage(struct regulator *regulator,
                                   int min_uV, int max_uV);
 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
+int regulator_set_voltage_time(struct regulator *regulator,
+                              int old_uV, int new_uV);
 int regulator_get_voltage(struct regulator *regulator);
 int regulator_sync_voltage(struct regulator *regulator);
 int regulator_set_current_limit(struct regulator *regulator,