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regulator: core: Add regulator_sync_voltage_rdev() 

Some NVIDIA Tegra devices use a CPU soft-reset method for the reboot and
in this case we need to restore the coupled voltages to the state that is
suitable for hardware during boot. Add new regulator_sync_voltage_rdev()
helper which is needed by regulator drivers in order to sync voltage of
a coupled regulators.

Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2021-05-28 02:54:00 +03:00 committed by Thierry Reding
parent 6efb943b86
commit 380d2b2d5a
2 changed files with 24 additions and 0 deletions
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23
drivers/regulator/core.c
View File

@ -4105,6 +4105,29 @@ int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
}
EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
int regulator_sync_voltage_rdev(struct regulator_dev *rdev)
{
int ret;
regulator_lock(rdev);
if (!rdev->desc->ops->set_voltage &&
!rdev->desc->ops->set_voltage_sel) {
ret = -EINVAL;
goto out;
}
/* balance only, if regulator is coupled */
if (rdev->coupling_desc.n_coupled > 1)
ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
else
ret = -EOPNOTSUPP;
out:
regulator_unlock(rdev);
return ret;
}
/**
* regulator_sync_voltage - re-apply last regulator output voltage
* @regulator: regulator source

1
include/linux/regulator/driver.h
View File

@ -540,6 +540,7 @@ int regulator_set_current_limit_regmap(struct regulator_dev *rdev,
int regulator_get_current_limit_regmap(struct regulator_dev *rdev);
void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
int regulator_set_ramp_delay_regmap(struct regulator_dev *rdev, int ramp_delay);
int regulator_sync_voltage_rdev(struct regulator_dev *rdev);
/*
* Helper functions intended to be used by regulator drivers prior registering