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regulator: add regulator_desc_list_voltage_linear_range 

Add regulator_desc_list_voltage_linear_range which can be used
by drivers for getting the voltages before regulator is registered.
This may be useful for drivers which need to fetch the voltage
selectors at device-tree parsing callback.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Acked-by: Mark Brown <broonie@kernel.org>
Tested-by: Angus Ainslie <angus@akkea.ca>
Reviewed-by: Angus Ainslie <angus@akkea.ca>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Matti Vaittinen 2019-02-14 11:38:05 +02:00 committed by Mark Brown
parent f43d1b388f
commit 6a47b4da55
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 46 additions and 21 deletions
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61
drivers/regulator/helpers.c
View File

@ -593,6 +593,45 @@ int regulator_list_voltage_pickable_linear_range(struct regulator_dev *rdev,
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_pickable_linear_range);
/**
* regulator_desc_list_voltage_linear_range - List voltages for linear ranges
*
* @desc: Regulator desc for regulator which volatges are to be listed
* @selector: Selector to convert into a voltage
*
* Regulators with a series of simple linear mappings between voltages
* and selectors who have set linear_ranges in the regulator descriptor
* can use this function prior regulator registration to list voltages.
* This is useful when voltages need to be listed during device-tree
* parsing.
*/
int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
unsigned int selector)
{
const struct regulator_linear_range *range;
int i;
if (!desc->n_linear_ranges) {
BUG_ON(!desc->n_linear_ranges);
return -EINVAL;
}
for (i = 0; i < desc->n_linear_ranges; i++) {
range = &desc->linear_ranges[i];
if (!(selector >= range->min_sel &&
selector <= range->max_sel))
continue;
selector -= range->min_sel;
return range->min_uV + (range->uV_step * selector);
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_desc_list_voltage_linear_range);
/**
* regulator_list_voltage_linear_range - List voltages for linear ranges
*
@ -606,27 +645,7 @@ EXPORT_SYMBOL_GPL(regulator_list_voltage_pickable_linear_range);
int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
unsigned int selector)
{
const struct regulator_linear_range *range;
int i;
if (!rdev->desc->n_linear_ranges) {
BUG_ON(!rdev->desc->n_linear_ranges);
return -EINVAL;
}
for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
range = &rdev->desc->linear_ranges[i];
if (!(selector >= range->min_sel &&
selector <= range->max_sel))
continue;
selector -= range->min_sel;
return range->min_uV + (range->uV_step * selector);
}
return -EINVAL;
return regulator_desc_list_voltage_linear_range(rdev->desc, selector);
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range);

6
include/linux/regulator/driver.h
View File

@ -539,4 +539,10 @@ void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
void regulator_lock(struct regulator_dev *rdev);
void regulator_unlock(struct regulator_dev *rdev);
/*
* Helper functions intended to be used by regulator drivers prior registering
* their regulators.
*/
int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
unsigned int selector);
#endif