[PATCH v4 3/6] regulator: consult min_uv, max_uv for regulator_get_voltage

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Fixed regulators currently always end up in the return -EINVAL else
branch. In Linux, the fixed regulator driver parses the DT and will
populate fixed_uV if min_uv and max_uv are equal. For barebox, it's
easier to do this in the core, but the result is the same:
We now can call regulator_get_voltage for fixed regulators.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v3 -> v4:
  - fix regulator_get_voltage when min_uv = 0 (Frank)
v2 -> v3:
  - fix botched rebase (regulator->ri-> instead of ri->)
v1 -> v2:
  - new patch
---
 drivers/regulator/core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 472b26f3a0ac..640fdf3b349e 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -574,13 +574,15 @@ EXPORT_SYMBOL_GPL(regulator_bulk_free);
 
 int regulator_get_voltage(struct regulator *regulator)
 {
+	struct regulator_internal *ri;
 	struct regulator_dev *rdev;
 	int sel, ret;
 
 	if (!regulator)
 		return -EINVAL;
 
-	rdev = regulator->ri->rdev;
+	ri = regulator->ri;
+	rdev = ri->rdev;
 
 	if (rdev->desc->ops->get_voltage_sel) {
 		sel = rdev->desc->ops->get_voltage_sel(rdev);
@@ -593,6 +595,8 @@ int regulator_get_voltage(struct regulator *regulator)
 		ret = rdev->desc->ops->list_voltage(rdev, 0);
 	} else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
 		ret = rdev->desc->fixed_uV;
+	} else if (ri->min_uv && ri->min_uv == ri->max_uv) {
+		ret = ri->min_uv;
 	} else {
 		return -EINVAL;
 	}
-- 
2.30.2