[PATCH v2 3/6] regulator: consult min_uv, max_uv for regulator_get_voltage

[Ahmad Fatoum]

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 at pengutronix.de>
---
v1 -> v2:
  - new patch
---
 drivers/regulator/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 472b26f3a0ac..4eeb00e5a363 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -593,6 +593,8 @@ 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->max_uv) {
+		ret = ri->min_uv;
 	} else {
 		return -EINVAL;
 	}
-- 
2.30.2