Document for the bFormatIndex attribute of the format descriptors is
missing. Add it.

Signed-off-by: Laurent Pinchart <[email protected]>
---
 Documentation/ABI/testing/configfs-usb-gadget-uvc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uvc 
b/Documentation/ABI/testing/configfs-usb-gadget-uvc
index 9281e2aa38df..9896c8aa0e14 100644
--- a/Documentation/ABI/testing/configfs-usb-gadget-uvc
+++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc
@@ -160,6 +160,10 @@ Description:       Specific MJPEG format descriptors
 
                All attributes read only,
                except bmaControls and bDefaultFrameIndex:
+               bFormatIndex            - unique id for this format descriptor;
+                                       only defined after parent header is
+                                       linked into the streaming class;
+                                       read-only
                bmaControls             - this format's data for bmaControls in
                                        the streaming header
                bmInterfaceFlags        - specifies interlace information,
@@ -204,6 +208,10 @@ Date:              Dec 2014
 KernelVersion: 4.0
 Description:   Specific uncompressed format descriptors
 
+               bFormatIndex            - unique id for this format descriptor;
+                                       only defined after parent header is
+                                       linked into the streaming class;
+                                       read-only
                bmaControls             - this format's data for bmaControls in
                                        the streaming header
                bmInterfaceFlags        - specifies interlace information,
-- 
Regards,

Laurent Pinchart

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