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Commit 98a175b6 authored by Yadwinder Singh Brar's avatar Yadwinder Singh Brar Committed by Mark Brown
Browse files

regulator: core: Add regulator_set_voltage_time_sel to calculate ramp delay. 



This patch adds regulator_set_voltage_time_sel(), to move into core, the
commonly used code by drivers to provide the .set_voltage_time_sel callback.
It will also allow us to configure different ramp delay for different
regulators easily.

Signed-off-by: default avatarYadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent ab0d1cbe

drivers/regulator/core.c

+24 −0
Original line number Diff line number Diff line
@@ -2279,6 +2279,30 @@ int regulator_set_voltage_time(struct regulator *regulator, 
}

EXPORT_SYMBOL_GPL(regulator_set_voltage_time);



/**

 *regulator_set_voltage_time_sel - get raise/fall time

 * @regulator: regulator source

 * @old_selector: selector for starting voltage

 * @new_selector: selector for target voltage

 *

 * Provided with the starting and target voltage selectors, this function

 * returns time in microseconds required to rise or fall to this new voltage

 *

 * Drivers providing uV_step in their regulator_desc and ramp_delay in

 * regulation_constraints can use this as their set_voltage_time_sel()

 * operation.

 */

int regulator_set_voltage_time_sel(struct regulator_dev *rdev,

				   unsigned int old_selector,

				   unsigned int new_selector)

{

	if (rdev->desc->ramp_delay && rdev->desc->uV_step)

		return DIV_ROUND_UP(rdev->desc->uV_step *

			abs(new_selector - old_selector),

			rdev->desc->ramp_delay) * 1000;

	return 0;

}



/**

 * regulator_sync_voltage - re-apply last regulator output voltage

 * @regulator: regulator source

include/linux/regulator/driver.h

+5 −0
Original line number Diff line number Diff line
@@ -170,6 +170,7 @@ enum regulator_type { 
 *

 * @min_uV: Voltage given by the lowest selector (if linear mapping)

 * @uV_step: Voltage increase with each selector (if linear mapping)

 * @ramp_delay: Time to settle down after voltage change (unit: mV/us)

 * @volt_table: Voltage mapping table (if table based mapping)

 *

 * @vsel_reg: Register for selector when using regulator_regmap_X_voltage_
@@ -189,6 +190,7 @@ struct regulator_desc { 


	unsigned int min_uV;

	unsigned int uV_step;

	unsigned int ramp_delay;



	const unsigned int *volt_table;
@@ -285,6 +287,9 @@ int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel); 
int regulator_is_enabled_regmap(struct regulator_dev *rdev);

int regulator_enable_regmap(struct regulator_dev *rdev);

int regulator_disable_regmap(struct regulator_dev *rdev);

int regulator_set_voltage_time_sel(struct regulator_dev *rdev,

				   unsigned int old_selector,

				   unsigned int new_selector);



void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);