From 8b0d9edf90c45567b582b1fcd1fa43c11ce39c1e Mon Sep 17 00:00:00 2001 From: Laxman Dewangan Date: Mon, 7 May 2012 18:08:26 +0530 Subject: 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 Signed-off-by: Mark Brown (cherry picked from commit a60cfce051dd5e22329df1018d278bf3e52d82bc) Change-Id: I522df8a72595622fd99cc46043c34610434d932f Signed-off-by: Laxman Dewangan Reviewed-on: http://git-master/r/105830 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: Bitan Biswas GVS: Gerrit_Virtual_Submit --- drivers/regulator/tps62360-regulator.c | 46 +++++++++++++++++++++++++++++----- 1 file changed, 40 insertions(+), 6 deletions(-) (limited to 'drivers') diff --git a/drivers/regulator/tps62360-regulator.c b/drivers/regulator/tps62360-regulator.c index 68941ec64445..117c654388a1 100644 --- a/drivers/regulator/tps62360-regulator.c +++ b/drivers/regulator/tps62360-regulator.c @@ -72,6 +72,7 @@ struct tps62360_chip { int lru_index[4]; int curr_vset_vsel[4]; int curr_vset_id; + int change_uv_per_us; }; /* @@ -115,7 +116,7 @@ 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; @@ -129,7 +130,7 @@ 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, @@ -194,10 +195,28 @@ 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, @@ -229,6 +248,7 @@ 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) @@ -256,9 +276,23 @@ 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; } -- cgit v1.2.3