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Date: Mon, 7 May 2012 13:05:39 +0530
From: Laxman Dewangan <ldewangan@...dia.com>
To: broonie@...nsource.wolfsonmicro.com, gregkh@...uxfoundation.org,
lrg@...com, linux-kernel@...r.kernel.org
Cc: Laxman Dewangan <ldewangan@...dia.com>
Subject: [PATCH V1 4/4] 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@...dia.com>
---
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 ad7d67a..3fd7341 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,
@@ -220,6 +239,7 @@ 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)
@@ -247,9 +267,23 @@ static int tps62360_init_dcdc(struct tps62360_chip *tps,
/* Reset output discharge path to reduce power consumption */
ret = regmap_clear_bits(tps->regmap, REG_RAMPCTRL, BIT(2));
- if (ret < 0)
+ if (ret < 0) {
dev_err(tps->dev, "%s() fails in clearing bits of 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;
}
--
1.7.1.1
--
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