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Commit 729de41b authored by Dinh Nguyen's avatar Dinh Nguyen Committed by Philipp Zabel
Browse files

reset: add reset_control_status helper function 



There are cases where a system will want to read a reset status bit before
doing any other toggling. Add a reset_control_status helper function to the
reset controller API.

Signed-off-by: default avatarDinh Nguyen <dinguyen@opensource.altera.com>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent f114040e

drivers/reset/core.c

+15 −0
Original line number Diff line number Diff line
@@ -125,6 +125,21 @@ int reset_control_deassert(struct reset_control *rstc) 
}

EXPORT_SYMBOL_GPL(reset_control_deassert);



/**

 * reset_control_status - returns a negative errno if not supported, a

 * positive value if the reset line is asserted, or zero if the reset

 * line is not asserted.

 * @rstc: reset controller

 */

int reset_control_status(struct reset_control *rstc)

{

	if (rstc->rcdev->ops->status)

		return rstc->rcdev->ops->status(rstc->rcdev, rstc->id);



	return -ENOSYS;

}

EXPORT_SYMBOL_GPL(reset_control_status);



/**

 * of_reset_control_get - Lookup and obtain a reference to a reset controller.

 * @node: device to be reset by the controller

include/linux/reset-controller.h

+2 −0
Original line number Diff line number Diff line
@@ -12,11 +12,13 @@ struct reset_controller_dev; 
 *         things to reset the device

 * @assert: manually assert the reset line, if supported

 * @deassert: manually deassert the reset line, if supported

 * @status: return the status of the reset line, if supported

 */

struct reset_control_ops {

	int (*reset)(struct reset_controller_dev *rcdev, unsigned long id);

	int (*assert)(struct reset_controller_dev *rcdev, unsigned long id);

	int (*deassert)(struct reset_controller_dev *rcdev, unsigned long id);

	int (*status)(struct reset_controller_dev *rcdev, unsigned long id);

};



struct module;

include/linux/reset.h

+7 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ struct reset_control; 
int reset_control_reset(struct reset_control *rstc);

int reset_control_assert(struct reset_control *rstc);

int reset_control_deassert(struct reset_control *rstc);

int reset_control_status(struct reset_control *rstc);



struct reset_control *reset_control_get(struct device *dev, const char *id);

void reset_control_put(struct reset_control *rstc);
@@ -57,6 +58,12 @@ static inline int reset_control_deassert(struct reset_control *rstc) 
	return 0;

}



static inline int reset_control_status(struct reset_control *rstc)

{

	WARN_ON(1);

	return 0;

}



static inline void reset_control_put(struct reset_control *rstc)

{

	WARN_ON(1);