regulator: If a single voltage is set with device tree then set apply_uV

Otherwise there is no way in the bindings to configure a fixed voltage
via software. It seems reasonable to assume that if the binding explicitly
specifies a voltage we want to actually use that voltage.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index acd7045d1601..b7b3fc3b09e2 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -34,6 +34,9 @@ static void of_get_regulation_constraints(struct device_node *np,
         /* Voltage change possible? */
         if (constraints->min_uV != constraints->max_uV)
                 constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
+        /* Only one voltage?  Then make sure it's set. */
+        if (constraints->min_uV == constraints->max_uV)
+                constraints->apply_uV = true;
 
         uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL);
         if (uV_offset)