regulator: core: Log when we bring constraints into range

This aids in debugging problems triggered by the regulator core applying
its constraints, we could potentially crash immediately after updating
the voltage if the constraints are buggy.
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/regulator/core.c

@@ -935,6 +935,8 @@ static int machine_constraints_voltage(struct regulator_dev *rdev,
 		}
 
 		if (target_min != current_uV || target_max != current_uV) {
+			rdev_info(rdev, "Bringing %duV into %d-%duV\n",
+				  current_uV, target_min, target_max);
 			ret = _regulator_do_set_voltage(
 				rdev, target_min, target_max);
 			if (ret < 0) {