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regulator: add set_voltage_time_sel infrastructure

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This makes it possible to set the stabilization time for voltage
regulators in the same manner as enable_time(). The interface
only supports regulators that implements fixed selectors.

Cc: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Linus Walleij 2011-03-17 13:24:36 +01:00 committed by Liam Girdwood
parent 79568b9412
commit 77af1b2641
2 changed files with 34 additions and 2 deletions
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25
drivers/regulator/core.c
View file

@ -1629,6 +1629,7 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
int ret;
int delay = 0;
unsigned int selector;
trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
@ -1662,6 +1663,22 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
}
}
/*
* If we can't obtain the old selector there is not enough
* info to call set_voltage_time_sel().
*/
if (rdev->desc->ops->set_voltage_time_sel &&
rdev->desc->ops->get_voltage_sel) {
unsigned int old_selector = 0;
ret = rdev->desc->ops->get_voltage_sel(rdev);
if (ret < 0)
return ret;
old_selector = ret;
delay = rdev->desc->ops->set_voltage_time_sel(rdev,
old_selector, selector);
}
if (best_val != INT_MAX) {
ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
selector = best_val;
@ -1672,6 +1689,14 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
ret = -EINVAL;
}
/* Insert any necessary delays */
if (delay >= 1000) {
mdelay(delay / 1000);
udelay(delay % 1000);
} else if (delay) {
udelay(delay);
}
if (ret == 0)
_notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
NULL);

11
include/linux/regulator/driver.h
View file

@ -63,7 +63,11 @@ enum regulator_status {
* when running with the specified parameters.
*
* @enable_time: Time taken for the regulator voltage output voltage to
* stabalise after being enabled, in microseconds.
* stabilise after being enabled, in microseconds.
* @set_voltage_time_sel: Time taken for the regulator voltage output voltage
* to stabilise after being set to a new value, in microseconds.
* The function provides the from and to voltage selector, the
* function should return the worst case.
*
* @set_suspend_voltage: Set the voltage for the regulator when the system
* is suspended.
@ -103,8 +107,11 @@ struct regulator_ops {
int (*set_mode) (struct regulator_dev *, unsigned int mode);
unsigned int (*get_mode) (struct regulator_dev *);
/* Time taken to enable the regulator */
/* Time taken to enable or set voltage on the regulator */
int (*enable_time) (struct regulator_dev *);
int (*set_voltage_time_sel) (struct regulator_dev *,
unsigned int old_selector,
unsigned int new_selector);
/* report regulator status ... most other accessors report
* control inputs, this reports results of combining inputs