regulator: Enable max8925 i2c sequence for control

Force to enable i2c as power up/down sequence. Otherwise, SD/LDO can't
be enabled or disabled via accessing i2c bus.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/regulator/max8925-regulator.c b/drivers/regulator/max8925-regulator.c
index 8ae147549c6a..e4dbd667c043 100644
--- a/drivers/regulator/max8925-regulator.c
+++ b/drivers/regulator/max8925-regulator.c
@@ -23,6 +23,10 @@
 #define SD1_DVM_SHIFT           5               /* SDCTL1 bit5 */
 #define SD1_DVM_EN              6               /* SDV1 bit 6 */
 
+/* bit definitions in SD & LDO control registers */
+#define OUT_ENABLE              0x1f            /* Power U/D sequence as I2C */
+#define OUT_DISABLE             0x1e            /* Power U/D sequence as I2C */
+
 struct max8925_regulator_info {
         struct regulator_desc   desc;
         struct regulator_dev    *regulator;
@@ -93,8 +97,8 @@ static int max8925_enable(struct regulator_dev *rdev)
         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 
         return max8925_set_bits(info->i2c, info->enable_reg,
-                                1 << info->enable_bit,
-                                1 << info->enable_bit);
+                                OUT_ENABLE << info->enable_bit,
+                                OUT_ENABLE << info->enable_bit);
 }
 
 static int max8925_disable(struct regulator_dev *rdev)
@@ -102,7 +106,8 @@ static int max8925_disable(struct regulator_dev *rdev)
         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 
         return max8925_set_bits(info->i2c, info->enable_reg,
-                                1 << info->enable_bit, 0);
+                                OUT_ENABLE << info->enable_bit,
+                                OUT_DISABLE << info->enable_bit);
 }
 
 static int max8925_is_enabled(struct regulator_dev *rdev)