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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>
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2 changed files with 24 additions and 0 deletions
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@ -4105,6 +4105,29 @@ int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
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}
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EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
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int regulator_sync_voltage_rdev(struct regulator_dev *rdev)
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{
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int ret;
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regulator_lock(rdev);
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if (!rdev->desc->ops->set_voltage &&
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!rdev->desc->ops->set_voltage_sel) {
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ret = -EINVAL;
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goto out;
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}
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/* balance only, if regulator is coupled */
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if (rdev->coupling_desc.n_coupled > 1)
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ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
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else
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ret = -EOPNOTSUPP;
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out:
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regulator_unlock(rdev);
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return ret;
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}
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/**
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* regulator_sync_voltage - re-apply last regulator output voltage
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* @regulator: regulator source
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@ -540,6 +540,7 @@ int regulator_set_current_limit_regmap(struct regulator_dev *rdev,
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int regulator_get_current_limit_regmap(struct regulator_dev *rdev);
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void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
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int regulator_set_ramp_delay_regmap(struct regulator_dev *rdev, int ramp_delay);
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int regulator_sync_voltage_rdev(struct regulator_dev *rdev);
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/*
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* Helper functions intended to be used by regulator drivers prior registering
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