Commit 380d2b2d authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Thierry Reding
Browse files

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: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 6efb943b

drivers/regulator/core.c

+23 −0
Original line number Diff line number Diff line
@@ -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

include/linux/regulator/driver.h

+1 −0
Original line number Diff line number Diff line
@@ -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