diff --git a/[refs] b/[refs]
index 2f2bad588adf..1283d90a012c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 39aa9b6e3cb1b2a564d3422eedb7f725179162d3
+refs/heads/master: 89f425ed5bf3d4fd97e840296dccd75b8e0fe4c9
diff --git a/trunk/drivers/regulator/core.c b/trunk/drivers/regulator/core.c
index f59821f10fdc..3700d0953d73 100644
--- a/trunk/drivers/regulator/core.c
+++ b/trunk/drivers/regulator/core.c
@@ -151,8 +151,11 @@ static int regulator_check_voltage(struct regulator_dev *rdev,
 	if (*min_uV < rdev->constraints->min_uV)
 		*min_uV = rdev->constraints->min_uV;
 
-	if (*min_uV > *max_uV)
+	if (*min_uV > *max_uV) {
+		rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
+			 min_uV, max_uV);
 		return -EINVAL;
+	}
 
 	return 0;
 }
@@ -205,8 +208,11 @@ static int regulator_check_current_limit(struct regulator_dev *rdev,
 	if (*min_uA < rdev->constraints->min_uA)
 		*min_uA = rdev->constraints->min_uA;
 
-	if (*min_uA > *max_uA)
+	if (*min_uA > *max_uA) {
+		rdev_err(rdev, "unsupportable current range: %d-%duA\n",
+			 min_uA, max_uA);
 		return -EINVAL;
+	}
 
 	return 0;
 }
@@ -221,6 +227,7 @@ static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
 	case REGULATOR_MODE_STANDBY:
 		break;
 	default:
+		rdev_err(rdev, "invalid mode %x specified\n", *mode);
 		return -EINVAL;
 	}