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media: v4l2-mc: add v4l2_create_fwnode_links helpers

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Add functions to create media links between source and sink subdevices,
based on the fwnode endpoint connections between them:

v4l2_create_fwnode_links_to_pad() - create links from a source subdev to
                                    a single sink pad based on fwnode
                                    endpoint connections.

v4l2_create_fwnode_links() - create all links from a source to sink subdev
                             based on fwnode endpoint connections.

These functions can be used in a sink's v4l2-async notifier subdev
bound callback to make the links from the bound subdev.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Steve Longerbeam
2020-05-01 19:15:37 +02:00
committed by Mauro Carvalho Chehab
parent 8fe784b9ab
commit 0d3c81e82d
2 changed files with 143 additions and 0 deletions
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48
include/media/v4l2-mc.h
View File

@@ -12,6 +12,7 @@
#include <media/media-device.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-subdev.h>
#include <linux/types.h>
/* We don't need to include pci.h or usb.h here */
@@ -84,6 +85,53 @@ void v4l_disable_media_source(struct video_device *vdev);
*/
int v4l_vb2q_enable_media_source(struct vb2_queue *q);
/**
* v4l2_create_fwnode_links_to_pad - Create fwnode-based links from a
* source subdev to a sink subdev pad.
*
* @src_sd - pointer to a source subdev
* @sink - pointer to a subdev sink pad
*
* This function searches for fwnode endpoint connections from a source
* subdevice to a single sink pad, and if suitable connections are found,
* translates them into media links to that pad. The function can be
* called by the sink subdevice, in its v4l2-async notifier subdev bound
* callback, to create links from a bound source subdevice.
*
* .. note::
*
* Any sink subdevice that calls this function must implement the
* .get_fwnode_pad media operation in order to verify endpoints passed
* to the sink are owned by the sink.
*
* Return 0 on success or a negative error code on failure.
*/
int v4l2_create_fwnode_links_to_pad(struct v4l2_subdev *src_sd,
struct media_pad *sink);
/**
* v4l2_create_fwnode_links - Create fwnode-based links from a source
* subdev to a sink subdev.
*
* @src_sd - pointer to a source subdevice
* @sink_sd - pointer to a sink subdevice
*
* This function searches for any and all fwnode endpoint connections
* between source and sink subdevices, and translates them into media
* links. The function can be called by the sink subdevice, in its
* v4l2-async notifier subdev bound callback, to create all links from
* a bound source subdevice.
*
* .. note::
*
* Any sink subdevice that calls this function must implement the
* .get_fwnode_pad media operation in order to verify endpoints passed
* to the sink are owned by the sink.
*
* Return 0 on success or a negative error code on failure.
*/
int v4l2_create_fwnode_links(struct v4l2_subdev *src_sd,
struct v4l2_subdev *sink_sd);
/**
* v4l2_pipeline_pm_get - Increase the use count of a pipeline