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authorDmitry Osipenko <digetx@gmail.com>2021-05-28 02:54:00 +0300
committerThierry Reding <treding@nvidia.com>2021-06-01 12:13:30 +0200
commit380d2b2d5a0491e47dfa250b40e3d849a922871d (patch)
treef8a9fe33fd48baa69b263ccd533b472c9b20fac2 /drivers
parent6efb943b8616ec53a5e444193dccf1af9ad627b5 (diff)
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.c23
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