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regulator: core: add API to get min/max voltage for rails

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Add API to get min/max rail voltage configured from platform for
given rails. This will help to set the pad voltage based on platform
specific power tree.

bug 200083043

Change-Id: I054734ca2a25b5c830525e27ab22e43534f67351
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/712001
(cherry picked from commit c0d1de0da091132d037e1bb32f2ee09b5c00369b)
Reviewed-on: http://git-master/r/1119836
Signed-off-by: Thomas Makin <halorocker89@gmail.com>
This commit is contained in:
Laxman Dewangan
2015-02-27 20:00:50 +05:30
committed by Thomas Makin
parent 78a3979426
commit 0b57a72543
2 changed files with 33 additions and 0 deletions
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31
drivers/regulator/core.c
View File

@@ -4552,6 +4552,37 @@ int regulator_get_voltage(struct regulator *regulator)
}
EXPORT_SYMBOL_GPL(regulator_get_voltage);
/**
* regulator_get_constraint_voltages - get platform specific constraint voltage,
* @regulator: regulator source
* @min_uV: Minimum microvolts.
* @max_uV: Maximum microvolts.
*
* This returns the current regulator voltage in uV.
*
* NOTE: If the regulator is disabled it will return the voltage value. This
* function should not be used to determine regulator state.
*/
int regulator_get_constraint_voltages(struct regulator *regulator,
int *min_uV, int *max_uV)
{
struct regulator_dev *rdev = regulator->rdev;
if (rdev->desc && rdev->desc->fixed_uV && rdev->desc->n_voltages == 1) {
*min_uV = rdev->desc->fixed_uV;
*max_uV = rdev->desc->fixed_uV;
return 0;
}
if (rdev->constraints) {
*min_uV = rdev->constraints->min_uV;
*max_uV = rdev->constraints->max_uV;
return 0;
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_get_constraint_voltages);
/**
* regulator_set_current_limit - set regulator output current limit
* @regulator: regulator source

2
include/linux/regulator/consumer.h
View File

@@ -231,6 +231,8 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
int regulator_set_voltage_time(struct regulator *regulator,
int old_uV, int new_uV);
int regulator_get_voltage(struct regulator *regulator);
int regulator_get_constraint_voltages(struct regulator *regulator,
int *min_uV, int *max_uV);
int regulator_sync_voltage(struct regulator *regulator);
int regulator_set_current_limit(struct regulator *regulator,
int min_uA, int max_uA);