regulator: Provide mode to status conversion function

This is useful for implementing get_status() in terms of get_mode().

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

include/linux/regulator/driver.h

@@ -193,6 +193,8 @@ void *rdev_get_drvdata(struct regulator_dev *rdev);
 struct device *rdev_get_dev(struct regulator_dev *rdev);
 int rdev_get_id(struct regulator_dev *rdev);
 
+int regulator_mode_to_status(unsigned int);
+
 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
 
 #endif