media: v4l2-subdev: add v4l2_subdev_get_fwnode_pad_1_to_1

Add a convenience function that can be used as the .get_fwnode_pad
operation for subdevices that map port numbers and pad indexes 1:1.
The function verifies the endpoint is owned by the subdevice, and if
so returns the endpoint port number.

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>

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 665b0c0..6b989fe 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -749,6 +749,28 @@ const struct v4l2_file_operations v4l2_subdev_fops = {
 };
 
 #ifdef CONFIG_MEDIA_CONTROLLER
+
+int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
+                                     struct fwnode_endpoint *endpoint)
+{
+       struct fwnode_handle *fwnode;
+       struct v4l2_subdev *sd;
+
+       if (!is_media_entity_v4l2_subdev(entity))
+               return -EINVAL;
+
+       sd = media_entity_to_v4l2_subdev(entity);
+
+       fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
+       fwnode_handle_put(fwnode);
+
+       if (dev_fwnode(sd->dev) == fwnode)
+               return endpoint->port;
+
+       return -ENXIO;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);
+
 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
                                      struct media_link *link,
                                      struct v4l2_subdev_format *source_fmt,

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index a4848de..f7fe78a 100644 (file)
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1028,6 +1028,23 @@ static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
 #ifdef CONFIG_MEDIA_CONTROLLER
 
 /**
+ * v4l2_subdev_get_fwnode_pad_1_to_1 - Get pad number from a subdev fwnode
+ *                                     endpoint, assuming 1:1 port:pad
+ *
+ * @entity - Pointer to the subdev entity
+ * @endpoint - Pointer to a parsed fwnode endpoint
+ *
+ * This function can be used as the .get_fwnode_pad operation for
+ * subdevices that map port numbers and pad indexes 1:1. If the endpoint
+ * is owned by the subdevice, the function returns the endpoint port
+ * number.
+ *
+ * Returns the endpoint port number on success or a negative error code.
+ */
+int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
+                                     struct fwnode_endpoint *endpoint);
+
+/**
  * v4l2_subdev_link_validate_default - validates a media link
  *
  * @sd: pointer to &struct v4l2_subdev