regulator: Don't create voltage sysfs entries if we can't read voltage

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

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 669d02160221..679f92ec9a45 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2503,7 +2503,8 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
         int                     status = 0;
 
         /* some attributes need specific methods to be displayed */
-        if (ops->get_voltage || ops->get_voltage_sel) {
+        if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
+            (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
                 status = device_create_file(dev, &dev_attr_microvolts);
                 if (status < 0)
                         return status;