linux-kernel - [PATCH v2 4/6] media: uvcvideo: Document how to format GUIDs

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Message-Id: <20251119-uvcdynctrl-v2-4-0359ffb98c9e@chromium.org>
Date: Wed, 19 Nov 2025 19:37:13 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Hans de Goede <hansg@...nel.org>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-usb@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v2 4/6] media: uvcvideo: Document how to format GUIDs

Manual formatting the GUIDs can lead to errors, document a
programmatically way to format the GUIDs from lsusb into something tha
the driver can use.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 include/linux/usb/uvc.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/usb/uvc.h b/include/linux/usb/uvc.h
index b939a01da11466747249c64c72a3ea40cd364a59..dea23aabbad48270c807463c1a7e1c0d1b79fc1f 100644
--- a/include/linux/usb/uvc.h
+++ b/include/linux/usb/uvc.h
@@ -10,6 +10,14 @@
 
 /* ------------------------------------------------------------------------
  * GUIDs
+ *
+ * The GUID returned by lsusb can be converted to this format with the
+ * following python snippet:
+ *
+ * import uuid
+ * id = "{01234567-89ab-cdef-0123-456789abcdef}"
+ * le = uuid.UUID(id).bytes_le
+ * print("{" + ", ".join([f"0x{b:02x}" for b in le]) + "}")
  */
 #define UVC_GUID_UVC_CAMERA \
 	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \

-- 
2.52.0.rc1.455.g30608eb744-goog