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authorMark Brown2016-04-07 16:22:36 +0200
committerMark Brown2016-04-12 06:32:30 +0200
commitfef95019016ac10e250d2c67a3c97af5797e3938 (patch)
tree02f9349da183e2fdc4d38199d30ad120f89452bf /drivers/regulator/core.c
parentLinux 4.6-rc1 (diff)
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regulator: core: Use parent voltage from the supply when bypassed
When a regulator is in bypass mode it is functioning as a switch returning the voltage set in the regulator will not give the voltage being output by the regulator as it's just passing through its supply. This means that when we are getting the voltage from a regulator we should check to see if it is in bypass mode and if it is we should report the voltage from the supply rather than that which is set on the regulator. Reported-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Mark Brown <broonie@kernel.org> [treding@nvidia.com: return early for bypass mode] Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/core.c')
-rw-r--r--drivers/regulator/core.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e0b764284773..990fd7b3da7d 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3109,6 +3109,20 @@ EXPORT_SYMBOL_GPL(regulator_sync_voltage);
static int _regulator_get_voltage(struct regulator_dev *rdev)
{
int sel, ret;
+ bool bypassed;
+
+ if (rdev->desc->ops->get_bypass) {
+ ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
+ if (ret < 0)
+ return ret;
+ if (bypassed) {
+ /* if bypassed the regulator must have a supply */
+ if (!rdev->supply)
+ return -EINVAL;
+
+ return _regulator_get_voltage(rdev->supply->rdev);
+ }
+ }
if (rdev->desc->ops->get_voltage_sel) {
sel = rdev->desc->ops->get_voltage_sel(rdev);