Unverified Commit 1cb7d291 authored by Biju Das's avatar Biju Das Committed by Mark Brown
Browse files

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



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: default avatarBiju Das <biju.das.jz@bp.renesas.com>
Link: https://patch.msgid.link/20240616105402.45211-4-biju.das.jz@bp.renesas.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f2661062

Documentation/power/regulator/consumer.rst

+6 −0
Original line number Diff line number Diff line
@@ -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);

drivers/regulator/core.c

+28 −0
Original line number Diff line number Diff line
@@ -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

include/linux/regulator/consumer.h

+7 −0
Original line number Diff line number Diff line
@@ -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)

{