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Commit d1e7de30 authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Mark Brown
Browse files

regulators: add regulator_can_change_voltage() function 



Introduce a regulator_can_change_voltage() function for the subsytems or
drivers which might check if applying voltage change is possible and use
special workaround code when the driver is used with fixed regulators or
regulators with disabled ability to change the voltage.

Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 9489e9dc

drivers/regulator/core.c

+22 −0
Original line number Diff line number Diff line
@@ -1866,6 +1866,28 @@ int regulator_is_enabled(struct regulator *regulator) 
}

EXPORT_SYMBOL_GPL(regulator_is_enabled);



/**

 * regulator_can_change_voltage - check if regulator can change voltage

 * @regulator: regulator source

 *

 * Returns positive if the regulator driver backing the source/client

 * can change its voltage, false otherwise. Usefull for detecting fixed

 * or dummy regulators and disabling voltage change logic in the client

 * driver.

 */

int regulator_can_change_voltage(struct regulator *regulator)

{

	struct regulator_dev	*rdev = regulator->rdev;



	if (rdev->constraints &&

	    rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE &&

	    rdev->desc->n_voltages > 1)

		return 1;



	return 0;

}

EXPORT_SYMBOL_GPL(regulator_can_change_voltage);



/**

 * regulator_count_voltages - count regulator_list_voltage() selectors

 * @regulator: regulator source

include/linux/regulator/consumer.h

+1 −0
Original line number Diff line number Diff line
@@ -160,6 +160,7 @@ int regulator_bulk_force_disable(int num_consumers, 
void regulator_bulk_free(int num_consumers,

			 struct regulator_bulk_data *consumers);



int regulator_can_change_voltage(struct regulator *regulator);

int regulator_count_voltages(struct regulator *regulator);

int regulator_list_voltage(struct regulator *regulator, unsigned selector);

int regulator_is_supported_voltage(struct regulator *regulator,