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regulator: core: Add helper for allow HW access to enable/disable regulator

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Add a helper function that allow regulator consumers to allow low-level
HW access, in order to enable/disable regulator in atomic context.

The use-case for RZ/G2L SoC is to enable VBUS selection register based
on vbus detection that happens in interrupt context.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://patch.msgid.link/20240616105402.45211-4-biju.das.jz@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Biju Das 2024-06-16 11:53:55 +01:00 committed by Mark Brown
parent f2661062f1
commit 1cb7d29157
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3 changed files with 41 additions and 0 deletions
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6
Documentation/power/regulator/consumer.rst
View File

@ -227,3 +227,9 @@ directly written to the voltage selector register, use::
int regulator_list_hardware_vsel(struct regulator *regulator,
unsigned selector);
To access the hardware for enabling/disabling the regulator, consumers must
use regulator_get_exclusive(), as it can't work if there's more than one
consumer. To enable/disable regulator use::
int regulator_hardware_enable(struct regulator *regulator, bool enable);

28
drivers/regulator/core.c
View File

@ -3408,6 +3408,34 @@ int regulator_list_hardware_vsel(struct regulator *regulator,
}
EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
/**
* regulator_hardware_enable - access the HW for enable/disable regulator
* @regulator: regulator source
* @enable: true for enable, false for disable
*
* Request that the regulator be enabled/disabled with the regulator output at
* the predefined voltage or current value.
*
* On success 0 is returned, otherwise a negative errno is returned.
*/
int regulator_hardware_enable(struct regulator *regulator, bool enable)
{
struct regulator_dev *rdev = regulator->rdev;
const struct regulator_ops *ops = rdev->desc->ops;
int ret = -EOPNOTSUPP;
if (!rdev->exclusive || !ops || !ops->enable || !ops->disable)
return ret;
if (enable)
ret = ops->enable(rdev);
else
ret = ops->disable(rdev);
return ret;
}
EXPORT_SYMBOL_GPL(regulator_hardware_enable);
/**
* regulator_get_linear_step - return the voltage step size between VSEL values
* @regulator: regulator source

7
include/linux/regulator/consumer.h
View File

@ -250,6 +250,7 @@ int regulator_get_hardware_vsel_register(struct regulator *regulator,
unsigned *vsel_mask);
int regulator_list_hardware_vsel(struct regulator *regulator,
unsigned selector);
int regulator_hardware_enable(struct regulator *regulator, bool enable);
/* regulator notifier block */
int regulator_register_notifier(struct regulator *regulator,
@ -571,6 +572,12 @@ static inline int regulator_list_hardware_vsel(struct regulator *regulator,
return -EOPNOTSUPP;
}
static inline int regulator_hardware_enable(struct regulator *regulator,
bool enable)
{
return -EOPNOTSUPP;
}
static inline int regulator_register_notifier(struct regulator *regulator,
struct notifier_block *nb)
{