1 files changed, 28 insertions, 8 deletions

diff --git a/drivers/regulator/helpers.c b/drivers/regulator/helpers.c
index f42b394a0c46..3e19ecbf7267 100644
--- a/drivers/regulator/helpers.c
+++ b/drivers/regulator/helpers.c
@@ -509,6 +509,33 @@ int regulator_map_voltage_pickable_linear_range(struct regulator_dev *rdev,
 EXPORT_SYMBOL_GPL(regulator_map_voltage_pickable_linear_range);
 
 /**
+ * regulator_desc_list_voltage_linear - List voltages with simple calculation
+ *
+ * @desc: Regulator desc for regulator which volatges are to be listed
+ * @selector: Selector to convert into a voltage
+ *
+ * Regulators with a simple linear mapping between voltages and
+ * selectors can set min_uV and uV_step in the regulator descriptor
+ * and then use this function prior regulator registration to list
+ * the voltages. This is useful when voltages need to be listed during
+ * device-tree parsing.
+ */
+int regulator_desc_list_voltage_linear(const struct regulator_desc *desc,
+				       unsigned int selector)
+{
+	if (selector >= desc->n_voltages)
+		return -EINVAL;
+
+	if (selector < desc->linear_min_sel)
+		return 0;
+
+	selector -= desc->linear_min_sel;
+
+	return desc->min_uV + (desc->uV_step * selector);
+}
+EXPORT_SYMBOL_GPL(regulator_desc_list_voltage_linear);
+
+/**
  * regulator_list_voltage_linear - List voltages with simple calculation
  *
  * @rdev: Regulator device
@@ -521,14 +548,7 @@ EXPORT_SYMBOL_GPL(regulator_map_voltage_pickable_linear_range);
 int regulator_list_voltage_linear(struct regulator_dev *rdev,
 				  unsigned int selector)
 {
-	if (selector >= rdev->desc->n_voltages)
-		return -EINVAL;
-	if (selector < rdev->desc->linear_min_sel)
-		return 0;
-
-	selector -= rdev->desc->linear_min_sel;
-
-	return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
+	return regulator_desc_list_voltage_linear(rdev->desc, selector);
 }
 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);