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| author | Laxman Dewangan <ldewangan@nvidia.com> | 2012-05-07 18:08:26 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-05-07 15:21:53 +0100 |
| commit | a60cfce051dd5e22329df1018d278bf3e52d82bc (patch) | |
| tree | 5c572c312580f61aab53c4d44b771b71b1282789 | |
| parent | 16ea003bd1c95ea55a0b88187ce7cbeaca760fcf (diff) | |
| download | blackbird-op-linux-a60cfce051dd5e22329df1018d278bf3e52d82bc.tar.gz blackbird-op-linux-a60cfce051dd5e22329df1018d278bf3e52d82bc.zip | |
regulator: tps62360: Provide settling time for voltage change
Settling time is require when there is voltage output change.
Implement set_voltage_time_sel() callback which returns delay time
for voltage change to settle down to new value.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
| -rw-r--r-- | drivers/regulator/tps62360-regulator.c | 46 |
1 files changed, 40 insertions, 6 deletions
diff --git a/drivers/regulator/tps62360-regulator.c b/drivers/regulator/tps62360-regulator.c index e8930805c525..d2f657ef5084 100644 --- a/drivers/regulator/tps62360-regulator.c +++ b/drivers/regulator/tps62360-regulator.c @@ -71,6 +71,7 @@ struct tps62360_chip { int lru_index[4]; int curr_vset_vsel[4]; int curr_vset_id; + int change_uv_per_us; }; /* @@ -114,7 +115,7 @@ update_lru_index: return found; } -static int tps62360_dcdc_get_voltage(struct regulator_dev *dev) +static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev) { struct tps62360_chip *tps = rdev_get_drvdata(dev); int vsel; @@ -128,7 +129,7 @@ static int tps62360_dcdc_get_voltage(struct regulator_dev *dev) return ret; } vsel = (int)data & tps->voltage_reg_mask; - return (tps->voltage_base + vsel * 10) * 1000; + return vsel; } static int tps62360_dcdc_set_voltage(struct regulator_dev *dev, @@ -193,10 +194,28 @@ static int tps62360_dcdc_list_voltage(struct regulator_dev *dev, return (tps->voltage_base + selector * 10) * 1000; } +static int tps62360_set_voltage_time_sel(struct regulator_dev *rdev, + unsigned int old_selector, unsigned int new_selector) +{ + struct tps62360_chip *tps = rdev_get_drvdata(rdev); + int old_uV, new_uV; + + old_uV = tps62360_dcdc_list_voltage(rdev, old_selector); + if (old_uV < 0) + return old_uV; + + new_uV = tps62360_dcdc_list_voltage(rdev, new_selector); + if (new_uV < 0) + return new_uV; + + return DIV_ROUND_UP(abs(old_uV - new_uV), tps->change_uv_per_us); +} + static struct regulator_ops tps62360_dcdc_ops = { - .get_voltage = tps62360_dcdc_get_voltage, - .set_voltage = tps62360_dcdc_set_voltage, - .list_voltage = tps62360_dcdc_list_voltage, + .get_voltage_sel = tps62360_dcdc_get_voltage_sel, + .set_voltage = tps62360_dcdc_set_voltage, + .list_voltage = tps62360_dcdc_list_voltage, + .set_voltage_time_sel = tps62360_set_voltage_time_sel, }; static int tps62360_init_force_pwm(struct tps62360_chip *tps, @@ -228,6 +247,7 @@ static int tps62360_init_dcdc(struct tps62360_chip *tps, { int ret; int i; + unsigned int ramp_ctrl; /* Initailize internal pull up/down control */ if (tps->en_internal_pulldn) @@ -255,9 +275,23 @@ static int tps62360_init_dcdc(struct tps62360_chip *tps, /* Reset output discharge path to reduce power consumption */ ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0); - if (ret < 0) + if (ret < 0) { dev_err(tps->dev, "%s() fails in updating reg %d\n", __func__, REG_RAMPCTRL); + return ret; + } + + /* Get ramp value from ramp control register */ + ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl); + if (ret < 0) { + dev_err(tps->dev, "%s() fails in reading reg %d\n", + __func__, REG_RAMPCTRL); + return ret; + } + ramp_ctrl = (ramp_ctrl >> 4) & 0x7; + + /* ramp mV/us = 32/(2^ramp_ctrl) */ + tps->change_uv_per_us = DIV_ROUND_UP(32000, BIT(ramp_ctrl)); return ret; } |
