regulator: helpers: Add regmap set_soft_start helper

Add a helper function regulator_set_soft_start_regmap to allow regmap
based regulators to easily enable soft start.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/helpers.c

@@ -445,6 +445,24 @@ int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
 }
 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
 
+/**
+ * regulator_set_soft_start_regmap - Default set_soft_start() using regmap
+ *
+ * @rdev: device to operate on.
+ */
+int regulator_set_soft_start_regmap(struct regulator_dev *rdev)
+{
+	unsigned int val;
+
+	val = rdev->desc->soft_start_val_on;
+	if (!val)
+		val = rdev->desc->soft_start_mask;
+
+	return regmap_update_bits(rdev->regmap, rdev->desc->soft_start_reg,
+				  rdev->desc->soft_start_mask, val);
+}
+EXPORT_SYMBOL_GPL(regulator_set_soft_start_regmap);
+
 /**
  * regulator_get_bypass_regmap - Default get_bypass() using regmap
  *

include/linux/regulator/driver.h

@@ -292,6 +292,10 @@ enum regulator_type {
  *			   set_active_discharge
  * @active_discharge_reg: Register for control when using regmap
  *			  set_active_discharge
+ * @soft_start_reg: Register for control when using regmap set_soft_start
+ * @soft_start_mask: Mask for control when using regmap set_soft_start
+ * @soft_start_val_on: Enabling value for control when using regmap
+ *                     set_soft_start
  *
  * @enable_time: Time taken for initial enable of regulator (in uS).
  * @off_on_delay: guard time (in uS), before re-enabling a regulator
@@ -345,6 +349,9 @@ struct regulator_desc {
 	unsigned int active_discharge_off;
 	unsigned int active_discharge_mask;
 	unsigned int active_discharge_reg;
+	unsigned int soft_start_reg;
+	unsigned int soft_start_mask;
+	unsigned int soft_start_val_on;
 
 	unsigned int enable_time;
 
@@ -476,6 +483,7 @@ int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 				   unsigned int new_selector);
 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable);
 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable);
+int regulator_set_soft_start_regmap(struct regulator_dev *rdev);
 
 int regulator_set_active_discharge_regmap(struct regulator_dev *rdev,
 					  bool enable);