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authorYadwinder Singh Brar <yadi.brar01@gmail.com>2012-06-11 16:11:08 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-06-18 00:08:52 +0400
commit6f0b2c696ca340cc2da381fe693fda3f8fdb2149 (patch)
tree71814a0078daec92d97fd3a5651d083cfb424132 /include/linux/regulator
parentb5fb77e0188dc85630b395eb0faddc4987be6ddb (diff)
downloadlinux-6f0b2c696ca340cc2da381fe693fda3f8fdb2149.tar.xz
regulator: Add ramp_delay configuration to constraints
For some hardwares ramp_delay for BUCKs is a configurable parameter which can be configured through DT or board file.This patch adds ramp_delay to regulator constraints and allow user to configure it for regulators which supports this feature, through DT or board file. It will provide two ways of setting the ramp_delay for a regulator: First, by setting it as constraints in board file(for configurable regulators) and set_machine_constraints() will take care of setting it on hardware by calling(the provided) .set_ramp_delay() operation(callback). Second, by setting it as data in regulator_desc(as fixed/default ramp_delay rate) for a regulator in driver. regulator_set_voltage_time_sel() will give preference to constraints->ramp_delay while reading ramp_delay rate for regulator. Similarly users should also take care accordingly while refering ramp_delay rate(in case of implementing their private .set_voltage_time_sel() callbacks for different regulators). [Rewrote subject for 80 columns -- broonie] Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'include/linux/regulator')
-rw-r--r--include/linux/regulator/driver.h3
-rw-r--r--include/linux/regulator/machine.h3
2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index ae5c25379237..ddc155d262da 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -67,6 +67,8 @@ enum regulator_status {
*
* @enable_time: Time taken for the regulator voltage output voltage to
* stabilise after being enabled, in microseconds.
+ * @set_ramp_delay: Set the ramp delay for the regulator. The driver should
+ * select ramp delay equal to or less than(closest) ramp_delay.
* @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
@@ -113,6 +115,7 @@ struct regulator_ops {
/* Time taken to enable or set voltage on the regulator */
int (*enable_time) (struct regulator_dev *);
+ int (*set_ramp_delay) (struct regulator_dev *, int ramp_delay);
int (*set_voltage_time_sel) (struct regulator_dev *,
unsigned int old_selector,
unsigned int new_selector);
diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index b02108446be7..5f37ad3cc172 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -92,6 +92,7 @@ struct regulator_state {
* mode.
* @initial_state: Suspend state to set by default.
* @initial_mode: Mode to set at startup.
+ * @ramp_delay: Time to settle down after voltage change (unit: mV/us)
*/
struct regulation_constraints {
@@ -125,6 +126,8 @@ struct regulation_constraints {
/* mode to set on startup */
unsigned int initial_mode;
+ unsigned int ramp_delay;
+
/* constraint flags */
unsigned always_on:1; /* regulator never off when system is on */
unsigned boot_on:1; /* bootloader/firmware enabled regulator */