regulator: add set_voltage_time_sel infrastructure
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>
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@ -1629,6 +1629,7 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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int ret;
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int delay = 0;
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unsigned int selector;
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trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
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@ -1662,6 +1663,22 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
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}
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}
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/*
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* If we can't obtain the old selector there is not enough
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* info to call set_voltage_time_sel().
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*/
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if (rdev->desc->ops->set_voltage_time_sel &&
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rdev->desc->ops->get_voltage_sel) {
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unsigned int old_selector = 0;
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ret = rdev->desc->ops->get_voltage_sel(rdev);
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if (ret < 0)
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return ret;
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old_selector = ret;
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delay = rdev->desc->ops->set_voltage_time_sel(rdev,
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old_selector, selector);
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}
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if (best_val != INT_MAX) {
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ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
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selector = best_val;
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@ -1672,6 +1689,14 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
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ret = -EINVAL;
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}
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/* Insert any necessary delays */
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if (delay >= 1000) {
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mdelay(delay / 1000);
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udelay(delay % 1000);
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} else if (delay) {
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udelay(delay);
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}
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if (ret == 0)
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_notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
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NULL);
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@ -63,7 +63,11 @@ enum regulator_status {
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* when running with the specified parameters.
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*
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* @enable_time: Time taken for the regulator voltage output voltage to
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* stabalise after being enabled, in microseconds.
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* stabilise after being enabled, in microseconds.
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* @set_voltage_time_sel: Time taken for the regulator voltage output voltage
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* to stabilise after being set to a new value, in microseconds.
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* The function provides the from and to voltage selector, the
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* function should return the worst case.
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*
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* @set_suspend_voltage: Set the voltage for the regulator when the system
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* is suspended.
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@ -103,8 +107,11 @@ struct regulator_ops {
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int (*set_mode) (struct regulator_dev *, unsigned int mode);
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unsigned int (*get_mode) (struct regulator_dev *);
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/* Time taken to enable the regulator */
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/* Time taken to enable or set voltage on the regulator */
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int (*enable_time) (struct regulator_dev *);
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int (*set_voltage_time_sel) (struct regulator_dev *,
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unsigned int old_selector,
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unsigned int new_selector);
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/* report regulator status ... most other accessors report
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* control inputs, this reports results of combining inputs
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