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regulator: max8973: add support to configure ETR based on rail load

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Add support to configure Enhanced Transient Response Enable (ETR)
and Sensitivity Selection based on maximum current i.e. expected
load on that rail.

Maxim recommended as:
- Enable ETR with high sensitivity (75mV/us) for 0 to 9A expected loads,
- Enable ETR with low sensitivity (150mV/us) for 9A to 12A expected loads.
- Disable ETR for expected load > 12A.

These recommendation will be configured for MAX77621 when maximum load
is provided through regulator constraint for maximum current from platform.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Laxman Dewangan 2015-07-01 18:31:44 +05:30 committed by Mark Brown
parent 3692db3a90
commit ffaab99184
1 changed files with 52 additions and 0 deletions
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52
drivers/regulator/max8973-regulator.c
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@ -75,6 +75,7 @@
#define MAX8973_DISCH_ENBABLE BIT(5)
#define MAX8973_FT_ENABLE BIT(4)
#define MAX8973_CKKADV_TRIP_MASK 0xC
#define MAX8973_CKKADV_TRIP_DISABLE 0xC
#define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0
#define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4
@ -282,6 +283,55 @@ static int max8973_set_ramp_delay(struct regulator_dev *rdev,
return ret;
}
static int max8973_set_current_limit(struct regulator_dev *rdev,
int min_ua, int max_ua)
{
struct max8973_chip *max = rdev_get_drvdata(rdev);
unsigned int val;
int ret;
if (max_ua <= 9000000)
val = MAX8973_CKKADV_TRIP_75mV_PER_US;
else if (max_ua <= 12000000)
val = MAX8973_CKKADV_TRIP_150mV_PER_US;
else
val = MAX8973_CKKADV_TRIP_DISABLE;
ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2,
MAX8973_CKKADV_TRIP_MASK, val);
if (ret < 0) {
dev_err(max->dev, "register %d update failed: %d\n",
MAX8973_CONTROL2, ret);
return ret;
}
return 0;
}
static int max8973_get_current_limit(struct regulator_dev *rdev)
{
struct max8973_chip *max = rdev_get_drvdata(rdev);
unsigned int control2;
int ret;
ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2);
if (ret < 0) {
dev_err(max->dev, "register %d read failed: %d\n",
MAX8973_CONTROL2, ret);
return ret;
}
switch (control2 & MAX8973_CKKADV_TRIP_MASK) {
case MAX8973_CKKADV_TRIP_DISABLE:
return 15000000;
case MAX8973_CKKADV_TRIP_150mV_PER_US:
return 12000000;
case MAX8973_CKKADV_TRIP_75mV_PER_US:
return 9000000;
default:
break;
}
return 9000000;
}
static const struct regulator_ops max8973_dcdc_ops = {
.get_voltage_sel = max8973_dcdc_get_voltage_sel,
.set_voltage_sel = max8973_dcdc_set_voltage_sel,
@ -632,6 +682,8 @@ static int max8973_probe(struct i2c_client *client,
max->ops.enable = regulator_enable_regmap;
max->ops.disable = regulator_disable_regmap;
max->ops.is_enabled = regulator_is_enabled_regmap;
max->ops.set_current_limit = max8973_set_current_limit;
max->ops.get_current_limit = max8973_get_current_limit;
break;
default:
break;