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>
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 5c6aeda..ff76abd 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2280,6 +2280,30 @@
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
*