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media: v4l: fwnode: Add convenience function for parsing common external refs

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Add v4l2_fwnode_parse_reference_sensor_common for parsing common
sensor properties that refer to adjacent devices such as flash or lens
driver chips.

As this is an association only, there's little a regular driver needs to
know about these devices as such.

Signed-off-by: Sakari Ailus <[email protected]>
Acked-by: Hans Verkuil <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Reviewed-by: Sebastian Reichel <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Sakari Ailus 2017-09-06 08:35:42 -04:00 • committed by Mauro Carvalho Chehab
commit 7a9ec808ad
3 changed files with 58 additions and 1 deletions
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3
include/media/v4l2-async.h
View file

@ -156,7 +156,8 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier);
* Release memory resources related to a notifier, including the async
* sub-devices allocated for the purposes of the notifier but not the notifier
* itself. The user is responsible for calling this function to clean up the
* notifier after calling @v4l2_async_notifier_parse_fwnode_endpoints.
* notifier after calling @v4l2_async_notifier_parse_fwnode_endpoints or
* @v4l2_fwnode_reference_parse_sensor_common.
*
* There is no harm from calling v4l2_async_notifier_cleanup in other
* cases as long as its memory has been zeroed after it has been

21
include/media/v4l2-fwnode.h
View file

@ -319,4 +319,25 @@ int v4l2_async_notifier_parse_fwnode_endpoints_by_port(
struct v4l2_fwnode_endpoint *vep,
struct v4l2_async_subdev *asd));
/**
* v4l2_fwnode_reference_parse_sensor_common - parse common references on
* sensors for async sub-devices
* @dev: the device node the properties of which are parsed for references
* @notifier: the async notifier where the async subdevs will be added
*
* Parse common sensor properties for remote devices related to the
* sensor and set up async sub-devices for them.
*
* Any notifier populated using this function must be released with a call to
* v4l2_async_notifier_release() after it has been unregistered and the async
* sub-devices are no longer in use, even in the case the function returned an
* error.
*
* Return: 0 on success
* -ENOMEM if memory allocation failed
* -EINVAL if property parsing failed
*/
int v4l2_async_notifier_parse_fwnode_sensor_common(
struct device *dev, struct v4l2_async_notifier *notifier);
#endif /* _V4L2_FWNODE_H */