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regulator: Add pull down support

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Some regulators need to be configured to pull down a resistor
when the regulator is disabled. Add an op (set_pull_down) and a
DT property + constraint to support this.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Stephen Boyd 2015-06-11 17:37:04 -07:00 • committed by Mark Brown
parent 22a10bca28
commit 23c779b9f9
5 changed files with 18 additions and 0 deletions
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5
include/linux/regulator/driver.h
View file

@ -121,6 +121,9 @@ struct regulator_linear_range {
* @set_suspend_mode: Set the operating mode for the regulator when the
* system is suspended.
*
* @set_pull_down: Configure the regulator to pull down when the regulator
* is disabled.
*
* This struct describes regulator operations which can be implemented by
* regulator chip drivers.
*/
@ -187,6 +190,8 @@ struct regulator_ops {
/* set regulator suspend operating mode (defined in consumer.h) */
int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode);
int (*set_pull_down) (struct regulator_dev *);
};
/*

2
include/linux/regulator/machine.h
View file

@ -87,6 +87,7 @@ struct regulator_state {
* applied.
* @apply_uV: Apply the voltage constraint when initialising.
* @ramp_disable: Disable ramp delay when initialising or when setting voltage.
* @pull_down: Enable pull down when regulator is disabled.
*
* @input_uV: Input voltage for regulator when supplied by another regulator.
*
@ -141,6 +142,7 @@ struct regulation_constraints {
unsigned boot_on:1; /* bootloader/firmware enabled regulator */
unsigned apply_uV:1; /* apply uV constraint if min == max */
unsigned ramp_disable:1; /* disable ramp delay */
unsigned pull_down:1; /* pull down resistor when regulator off */
};
/**