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regulator: core: Add support for active-discharge configuration 

Add support to enable/disable active discharge of regulator via
machine constraints. This configuration is done when setting
machine constraint during regulator register and if regulator
driver implemented the callback ops.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Laxman Dewangan 2016-03-02 16:24:46 +05:30 committed by Mark Brown
parent bd667d40a9
commit 670666b9e0
4 changed files with 32 additions and 0 deletions
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11
drivers/regulator/core.c
View File

@ -1140,6 +1140,17 @@ static int set_machine_constraints(struct regulator_dev *rdev,
}
}
if (rdev->constraints->active_discharge && ops->set_active_discharge) {
bool ad_state = (rdev->constraints->active_discharge ==
REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
ret = ops->set_active_discharge(rdev, ad_state);
if (ret < 0) {
rdev_err(rdev, "failed to set active discharge\n");
return ret;
}
}
print_constraints(rdev);
return 0;
out:

6
drivers/regulator/of_regulator.c
View File

@ -93,6 +93,12 @@ static void of_get_regulation_constraints(struct device_node *np,
constraints->soft_start = of_property_read_bool(np,
"regulator-soft-start");
ret = of_property_read_u32(np, "regulator-active-discharge", &pval);
if (!ret) {
constraints->active_discharge =
(pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE :
REGULATOR_ACTIVE_DISCHARGE_DISABLE;
}
if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
if (desc && desc->of_map_mode) {

3
include/linux/regulator/driver.h
View File

@ -93,6 +93,8 @@ struct regulator_linear_range {
* @get_current_limit: Get the configured limit for a current-limited regulator.
* @set_input_current_limit: Configure an input limit.
*
* @set_active_discharge: Set active discharge enable/disable of regulators.
*
* @set_mode: Set the configured operating mode for the regulator.
* @get_mode: Get the configured operating mode for the regulator.
* @get_status: Return actual (not as-configured) status of regulator, as a
@ -149,6 +151,7 @@ struct regulator_ops {
int (*set_input_current_limit) (struct regulator_dev *, int lim_uA);
int (*set_over_current_protection) (struct regulator_dev *);
int (*set_active_discharge) (struct regulator_dev *, bool enable);
/* enable/disable regulator */
int (*enable) (struct regulator_dev *);

12
include/linux/regulator/machine.h
View File

@ -42,6 +42,13 @@ struct regulator;
#define REGULATOR_CHANGE_DRMS 0x10
#define REGULATOR_CHANGE_BYPASS 0x20
/* Regulator active discharge flags */
enum regulator_active_discharge {
REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
REGULATOR_ACTIVE_DISCHARGE_DISABLE,
REGULATOR_ACTIVE_DISCHARGE_ENABLE,
};
/**
* struct regulator_state - regulator state during low power system states
*
@ -100,6 +107,9 @@ struct regulator_state {
* @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: uV/us)
* @active_discharge: Enable/disable active discharge. The enum
* regulator_active_discharge values are used for
* initialisation.
* @enable_time: Turn-on time of the rails (unit: microseconds)
*/
struct regulation_constraints {
@ -140,6 +150,8 @@ struct regulation_constraints {
unsigned int ramp_delay;
unsigned int enable_time;
unsigned int active_discharge;
/* constraint flags */
unsigned always_on:1; /* regulator never off when system is on */
unsigned boot_on:1; /* bootloader/firmware enabled regulator */