[media] v4l: Implement v4l2_subdev_link_validate()

v4l2_subdev_link_validate() is the default op for validating a link. In V4L2
subdev context, it is used to call a pad op which performs the proper link
check without much extra work.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 7e850355a6f0..1c2318b15bd2 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -470,6 +470,11 @@ struct v4l2_subdev_pad_ops {
                              struct v4l2_subdev_selection *sel);
         int (*set_selection)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
                              struct v4l2_subdev_selection *sel);
+#ifdef CONFIG_MEDIA_CONTROLLER
+        int (*link_validate)(struct v4l2_subdev *sd, struct media_link *link,
+                             struct v4l2_subdev_format *source_fmt,
+                             struct v4l2_subdev_format *sink_fmt);
+#endif /* CONFIG_MEDIA_CONTROLLER */
 };
 
 struct v4l2_subdev_ops {
@@ -602,6 +607,13 @@ static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
         return sd->host_priv;
 }
 
+#ifdef CONFIG_MEDIA_CONTROLLER
+int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
+                                      struct media_link *link,
+                                      struct v4l2_subdev_format *source_fmt,
+                                      struct v4l2_subdev_format *sink_fmt);
+int v4l2_subdev_link_validate(struct media_link *link);
+#endif /* CONFIG_MEDIA_CONTROLLER */
 void v4l2_subdev_init(struct v4l2_subdev *sd,
                       const struct v4l2_subdev_ops *ops);