From 77af1b2641faf45788a0d480db94082ebee931dc Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Thu, 17 Mar 2011 13:24:36 +0100 Subject: 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 Signed-off-by: Linus Walleij Acked-by: Mark Brown Signed-off-by: Liam Girdwood --- drivers/regulator/core.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers') diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index e611f6797e6a..e7e4460dcb92 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -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); -- cgit v1.2.2