diff mbox series

[v6,02/22] media: v4l2-subdev: add v4l2_subdev_get_fwnode_pad_1_to_1

Message ID 20200501171556.14731-3-slongerbeam@gmail.com
State Superseded
Headers show
Series media: imx: Create media links in bound notifiers | expand

Commit Message

Steve Longerbeam May 1, 2020, 5:15 p.m. UTC
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>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 22 ++++++++++++++++++++++
 include/media/v4l2-subdev.h           | 17 +++++++++++++++++
 2 files changed, 39 insertions(+)
diff mbox series

Patch

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index a376b351135f..3bdda686341f 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -696,6 +696,28 @@  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 a4848de59852..f7fe78a6f65a 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1027,6 +1027,23 @@  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
  *