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regulator: add PM suspend and resume hooks

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In this patch, consumers are allowed to set suspend voltage, and this
actually just set the "uV" in constraint::regulator_state, when the
regulator_suspend_late() was called by PM core through callback when
the system is entering into suspend, the regulator device would act
suspend activity then.

And it assumes that if any consumer set suspend voltage, the regulator
device should be enabled in the suspend state.  And if the suspend
voltage of a regulator device for all consumers was set zero, the
regulator device would be off in the suspend state.

This patch also provides a new function hook to regulator devices for
resuming from suspend states.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chunyan Zhang
2018-01-26 21:08:47 +08:00
committed by Mark Brown
parent aa27bbc6c6
commit f7efad10b5
4 changed files with 251 additions and 33 deletions
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2
include/linux/regulator/driver.h
View File

@@ -214,6 +214,8 @@ struct regulator_ops {
/* set regulator suspend operating mode (defined in consumer.h) */
int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode);
int (*resume_early)(struct regulator_dev *rdev);
int (*set_pull_down) (struct regulator_dev *);
};

13
include/linux/regulator/machine.h
View File

@@ -66,17 +66,24 @@ enum regulator_active_discharge {
* state. One of enabled or disabled must be set for the
* configuration to be applied.
*
* @uV: Operating voltage during suspend.
* @uV: Default operating voltage during suspend, it can be adjusted
* among <min_uV, max_uV>.
* @min_uV: Minimum suspend voltage may be set.
* @max_uV: Maximum suspend voltage may be set.
* @mode: Operating mode during suspend.
* @enabled: operations during suspend.
* - DO_NOTHING_IN_SUSPEND
* - DISABLE_IN_SUSPEND
* - ENABLE_IN_SUSPEND
* @changeable: Is this state can be switched between enabled/disabled,
*/
struct regulator_state {
int uV; /* suspend voltage */
unsigned int mode; /* suspend regulator operating mode */
int uV;
int min_uV;
int max_uV;
unsigned int mode;
int enabled;
bool changeable;
};
/**