regulator: Fix default constraints for fixed voltage regulators

Default voltage constraints were being provided for fixed voltage
regulator where board constraints were not provided but these constraints
used INT_MIN as the default minimum voltage which is not a valid value
since it is less than zero. Use 1uV instead.

Also set the default values we set in the constraints themselves since
otherwise the max_uV constraint we determine will not be stored in the
actual constraint strucutre and will therefore not be used.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 2f14c16f58c3..98c3a74e9949 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -703,10 +703,13 @@ static int set_machine_constraints(struct regulator_dev *rdev,
                 int     cmin = constraints->min_uV;
                 int     cmax = constraints->max_uV;
 
-                /* it's safe to autoconfigure fixed-voltage supplies */
+                /* it's safe to autoconfigure fixed-voltage supplies
+                   and the constraints are used by list_voltage. */
                 if (count == 1 && !cmin) {
-                        cmin = INT_MIN;
+                        cmin = 1;
                         cmax = INT_MAX;
+                        constraints->min_uV = cmin;
+                        constraints->max_uV = cmax;
                 }
 
                 /* voltage constraints are optional */