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| author | Yadwinder Singh Brar <yadi.brar01@gmail.com> | 2012-06-09 16:40:38 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-06-11 12:01:46 +0800 |
| commit | 98a175b60f46a80dfa44fb0e0807f2e5a351f35f (patch) | |
| tree | 07c81163935868d9b1334a1bb33f8edddc6a29ca /drivers/regulator/core.c | |
| parent | ab0d1cbe55014ac65cfc317f8ef2cd5fa4b7d4da (diff) | |
| download | lwn-98a175b60f46a80dfa44fb0e0807f2e5a351f35f.tar.gz lwn-98a175b60f46a80dfa44fb0e0807f2e5a351f35f.zip | |
regulator: core: Add regulator_set_voltage_time_sel to calculate ramp delay.
This patch adds regulator_set_voltage_time_sel(), to move into core, the
commonly used code by drivers to provide the .set_voltage_time_sel callback.
It will also allow us to configure different ramp delay for different
regulators easily.
Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator/core.c')
| -rw-r--r-- | drivers/regulator/core.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 5c6aedaa934d..ff76abde3ab3 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2280,6 +2280,30 @@ int regulator_set_voltage_time(struct regulator *regulator, EXPORT_SYMBOL_GPL(regulator_set_voltage_time); /** + *regulator_set_voltage_time_sel - get raise/fall time + * @regulator: regulator source + * @old_selector: selector for starting voltage + * @new_selector: selector for target voltage + * + * Provided with the starting and target voltage selectors, this function + * returns time in microseconds required to rise or fall to this new voltage + * + * Drivers providing uV_step in their regulator_desc and ramp_delay in + * regulation_constraints can use this as their set_voltage_time_sel() + * operation. + */ +int regulator_set_voltage_time_sel(struct regulator_dev *rdev, + unsigned int old_selector, + unsigned int new_selector) +{ + if (rdev->desc->ramp_delay && rdev->desc->uV_step) + return DIV_ROUND_UP(rdev->desc->uV_step * + abs(new_selector - old_selector), + rdev->desc->ramp_delay) * 1000; + return 0; +} + +/** * regulator_sync_voltage - re-apply last regulator output voltage * @regulator: regulator source * |