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| author | Dinh Nguyen <dinguyen@opensource.altera.com> | 2014-10-10 10:21:14 -0500 |
|---|---|---|
| committer | Philipp Zabel <p.zabel@pengutronix.de> | 2014-10-20 10:11:29 +0200 |
| commit | 729de41baf63e2172b9d61de61bbd53f231095ca (patch) | |
| tree | 8c04f97eb59f6cd90977f87b5476ec6711546730 /drivers/reset | |
| parent | f114040e3ea6e07372334ade75d1ee0775c355e1 (diff) | |
| download | linux-729de41baf63e2172b9d61de61bbd53f231095ca.tar.bz2 | |
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: Dinh Nguyen <dinguyen@opensource.altera.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/reset')
| -rw-r--r-- | drivers/reset/core.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/reset/core.c b/drivers/reset/core.c index baeaf82d40d9..7955e00d04d4 100644 --- a/drivers/reset/core.c +++ b/drivers/reset/core.c @@ -126,6 +126,21 @@ 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 * @id: reset line name |