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>

diff --git a/drivers/regulator/tps62360-regulator.c b/drivers/regulator/tps62360-regulator.c
index e8930805c5252b03b245e1b23c029fc9261b3324..d2f657ef50841a2c2a243c8c89e61b71d94427f9 100644 (file)
--- 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;
 }