diff options
| author | Kevin Liu <kliu5@marvell.com> | 2012-01-04 11:12:04 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-01-06 22:56:14 +0400 |
| commit | 65364e9ab958f4ad21c5c7b6cc8e2e458128dbcb (patch) | |
| tree | 481535ab2a705f68270015d64fedc67aca10d7e0 /drivers/regulator | |
| parent | e1de2f423462a5c6ba2c902dff1f5ddd8d3dbde3 (diff) | |
| download | linux-65364e9ab958f4ad21c5c7b6cc8e2e458128dbcb.tar.xz | |
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')
| -rw-r--r-- | drivers/regulator/max8925-regulator.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/drivers/regulator/max8925-regulator.c b/drivers/regulator/max8925-regulator.c index f976e5d0867e..cc290d37c463 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[] = { |