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authorKevin Liu <kliu5@marvell.com>2012-01-04 15:12:04 +0800
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-01-06 10:56:14 -0800
commit65364e9ab958f4ad21c5c7b6cc8e2e458128dbcb (patch)
tree481535ab2a705f68270015d64fedc67aca10d7e0 /drivers/regulator/max8925-regulator.c
parente1de2f423462a5c6ba2c902dff1f5ddd8d3dbde3 (diff)
downloadlinaro-lsk-65364e9ab958f4ad21c5c7b6cc8e2e458128dbcb.tar.gz
regulator: max8925: fix enabled/disabled judgement mistake
Max8925 ldo status should be determined by two factors: 1. power up/down sequence selection(LDOCTL[4:2]). 2. i2c enable bit(LDOCTL[0]). Max8925 ldo support two types of power up/down sequence: 1. flexible sequence(LDOCTL[4:2] = 0~6). 2. i2c sequence(LDOCTL[4:2] = 7). With flexible sequence selected, the ldo is enabled during power up by default. With i2c sequence selected, the ldo is controlled by the i2c enable bit(LDOCTL[0]). Signed-off-by: Kevin Liu <kliu5@marvell.com> Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator/max8925-regulator.c')
-rw-r--r--drivers/regulator/max8925-regulator.c33
1 files changed, 20 insertions, 13 deletions
diff --git a/drivers/regulator/max8925-regulator.c b/drivers/regulator/max8925-regulator.c
index f976e5d0867..cc290d37c46 100644
--- a/drivers/regulator/max8925-regulator.c
+++ b/drivers/regulator/max8925-regulator.c
@@ -24,9 +24,13 @@
#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 */
+/* bit definitions in LDO control registers */
+#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */
+#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */
+#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */
+#define LDO_I2C_EN 0x1 /* Enable by i2c */
+#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */
+#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */
struct max8925_regulator_info {
struct regulator_desc desc;
@@ -40,7 +44,6 @@ struct max8925_regulator_info {
int vol_reg;
int vol_shift;
int vol_nbits;
- int enable_bit;
int enable_reg;
};
@@ -98,8 +101,10 @@ 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,
- OUT_ENABLE << info->enable_bit,
- OUT_ENABLE << info->enable_bit);
+ LDO_SEQ_MASK << LDO_SEQ_SHIFT |
+ LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
+ LDO_SEQ_I2C << LDO_SEQ_SHIFT |
+ LDO_I2C_EN << LDO_I2C_EN_SHIFT);
}
static int max8925_disable(struct regulator_dev *rdev)
@@ -107,20 +112,24 @@ 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,
- OUT_ENABLE << info->enable_bit,
- OUT_DISABLE << info->enable_bit);
+ LDO_SEQ_MASK << LDO_SEQ_SHIFT |
+ LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
+ LDO_SEQ_I2C << LDO_SEQ_SHIFT);
}
static int max8925_is_enabled(struct regulator_dev *rdev)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
- int ret;
+ int ldo_seq, ret;
ret = max8925_reg_read(info->i2c, info->enable_reg);
if (ret < 0)
return ret;
-
- return ret & (1 << info->enable_bit);
+ ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
+ if (ldo_seq != LDO_SEQ_I2C)
+ return 1;
+ else
+ return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
}
static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
@@ -188,7 +197,6 @@ static struct regulator_ops max8925_regulator_ldo_ops = {
.vol_shift = 0, \
.vol_nbits = 6, \
.enable_reg = MAX8925_SDCTL##_id, \
- .enable_bit = 0, \
}
#define MAX8925_LDO(_id, min, max, step) \
@@ -207,7 +215,6 @@ static struct regulator_ops max8925_regulator_ldo_ops = {
.vol_shift = 0, \
.vol_nbits = 6, \
.enable_reg = MAX8925_LDOCTL##_id, \
- .enable_bit = 0, \
}
static struct max8925_regulator_info max8925_regulator_info[] = {