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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
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@@ -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