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>

1 files changed, 40 insertions, 6 deletions

diff --git a/drivers/regulator/tps62360-regulator.c b/drivers/regulator/tps62360-regulator.c
index e8930805c52..d2f657ef508 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;
 }