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Commit fcf371ee authored by Axel Lin's avatar Axel Lin Committed by Mark Brown
Browse files

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: default avatarAxel Lin <axel.lin@ingics.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 41ef2d56

drivers/regulator/core.c

+31 −0
Original line number Diff line number Diff line
@@ -2137,6 +2137,37 @@ int regulator_map_voltage_iterate(struct regulator_dev *rdev, 
}

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

 *

include/linux/regulator/driver.h

+2 −0
Original line number Diff line number Diff line
@@ -329,6 +329,8 @@ int regulator_map_voltage_linear(struct regulator_dev *rdev, 
				  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);