media: v4l: fwnode: v4l2_async_notifier_parse_fwnode_endpoints is deprecated

Document that v4l2_async_notifier_parse_fwnode_endpoints() is deprecated.
Its functionality has been replaced by other, better functions. Also add a
reference to an example if someone ends up wandering here.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

include/media/v4l2-fwnode.h

@@ -453,6 +453,10 @@ typedef int (*parse_endpoint_func)(struct device *dev,
  * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
  *		    endpoint. Optional.
  *
+ * DEPRECATED! This function is deprecated. Don't use it in new drivers.
+ * Instead see an example in cio2_parse_firmware() function in
+ * drivers/media/pci/intel/ipu3/ipu3-cio2.c .
+ *
  * Parse the fwnode endpoints of the @dev device and populate the async sub-
  * devices list in the notifier. The @parse_endpoint callback function is
  * called for each endpoint with the corresponding async sub-device pointer to