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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: Yadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Yadwinder Singh Brar 2012-06-09 16:40:38 +05:30 committed by Mark Brown
parent ab0d1cbe55
commit 98a175b60f
2 changed files with 29 additions and 0 deletions
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24
drivers/regulator/core.c
View File

@ -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

5
include/linux/regulator/driver.h
View File

@ -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);