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reset: add reset_control_status helper function

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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: Dinh Nguyen <dinguyen@opensource.altera.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Dinh Nguyen 2014-10-10 10:21:14 -05:00 committed by Philipp Zabel
parent f114040e3e
commit 729de41baf
3 changed files with 24 additions and 0 deletions
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15
drivers/reset/core.c
View file

@ -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

2
include/linux/reset-controller.h
View file

@ -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;

7
include/linux/reset.h
View file

@ -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);