regulator: core: Add regulator_map_voltage_ascend() API
A lot of regulator hardware has ascendant voltage list.
This patch adds regulator_map_voltage_ascend() and export it.
Drivers that have ascendant voltage list can use this as their map_voltage()
operation, this is more efficient than default regulator_map_voltage_iterate()
function.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e3661c2..56f4ca0 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2138,6 +2138,37 @@
EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
/**
+ * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
+ *
+ * @rdev: Regulator to operate on
+ * @min_uV: Lower bound for voltage
+ * @max_uV: Upper bound for voltage
+ *
+ * Drivers that have ascendant voltage list can use this as their
+ * map_voltage() operation.
+ */
+int regulator_map_voltage_ascend(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ int i, ret;
+
+ for (i = 0; i < rdev->desc->n_voltages; i++) {
+ ret = rdev->desc->ops->list_voltage(rdev, i);
+ if (ret < 0)
+ continue;
+
+ if (ret > max_uV)
+ break;
+
+ if (ret >= min_uV && ret <= max_uV)
+ return i;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);
+
+/**
* regulator_map_voltage_linear - map_voltage() for simple linear mappings
*
* @rdev: Regulator to operate on
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 7df93f5..2acdc66 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -329,6 +329,8 @@
int min_uV, int max_uV);
int regulator_map_voltage_iterate(struct regulator_dev *rdev,
int min_uV, int max_uV);
+int regulator_map_voltage_ascend(struct regulator_dev *rdev,
+ int min_uV, int max_uV);
int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel);
int regulator_is_enabled_regmap(struct regulator_dev *rdev);