[RFC/RFT][PATCH 1/3] regulator: core: Add enable_pulldown flag to indicate pulldown on EN input

[Axel Lin <axel.lin@ingics.com>]

Add enable_pulldown flag to indicate pulldown on EN input when using
regulator_enable_regmap and friends APIs.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
---
 drivers/regulator/core.c         |   24 ++++++++++++++++++++----
 include/linux/regulator/driver.h |    3 +++
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index da9782b..aff977f 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1794,7 +1794,10 @@ int regulator_is_enabled_regmap(struct regulator_dev *rdev)
 	if (ret != 0)
 		return ret;
 
-	return (val & rdev->desc->enable_mask) != 0;
+	if (rdev->desc->enable_pulldown)
+		return (val & rdev->desc->enable_mask) == 0;
+	else
+		return (val & rdev->desc->enable_mask) != 0;
 }
 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
 
@@ -1809,9 +1812,15 @@ EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
  */
 int regulator_enable_regmap(struct regulator_dev *rdev)
 {
+	unsigned int val;
+
+	if (rdev->desc->enable_pulldown)
+		val = 0;
+	else
+		val = rdev->desc->enable_mask;
+
 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
-				  rdev->desc->enable_mask,
-				  rdev->desc->enable_mask);
+				  rdev->desc->enable_mask, val);
 }
 EXPORT_SYMBOL_GPL(regulator_enable_regmap);
 
@@ -1826,8 +1835,15 @@ EXPORT_SYMBOL_GPL(regulator_enable_regmap);
  */
 int regulator_disable_regmap(struct regulator_dev *rdev)
 {
+	unsigned int val;
+
+	if (rdev->desc->enable_pulldown)
+		val = rdev->desc->enable_mask;
+	else
+		val = 0;
+
 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
-				  rdev->desc->enable_mask, 0);
+				  rdev->desc->enable_mask, val);
 }
 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
 
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 23070fd..7ce1d0c 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -199,6 +199,8 @@ enum regulator_type {
  *                output when using regulator_set_voltage_sel_regmap
  * @enable_reg: Register for control when using regmap enable/disable ops
  * @enable_mask: Mask for control when using regmap enable/disable ops
+ * @enable_pulldown: A flag to indicate pulldown on EN input when using
+ *                   regulator_enable_regmap and friends APIs.
  *
  * @enable_time: Time taken for initial enable of regulator (in uS).
  */
@@ -226,6 +228,7 @@ struct regulator_desc {
 	unsigned int apply_bit;
 	unsigned int enable_reg;
 	unsigned int enable_mask;
+	bool enable_pulldown;
 	unsigned int bypass_reg;
 	unsigned int bypass_mask;
 
-- 
1.7.9.5