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| author | Dmitry Osipenko <digetx@gmail.com> | 2021-05-28 02:54:00 +0300 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2021-06-01 12:13:30 +0200 |
| commit | 380d2b2d5a0491e47dfa250b40e3d849a922871d (patch) | |
| tree | f8a9fe33fd48baa69b263ccd533b472c9b20fac2 /drivers | |
| parent | 6efb943b8616ec53a5e444193dccf1af9ad627b5 (diff) | |
| download | linux-380d2b2d5a0491e47dfa250b40e3d849a922871d.tar.gz | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/regulator/core.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index f192bf19492e..ead0b6d2af45 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -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 |