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[PATCH/RFC,2/2] Feature removal: using capture and output capabilities for m2m devices

Message ID 1341084223-4616-3-git-send-email-sylvester.nawrocki@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Sylwester Nawrocki June 30, 2012, 7:23 p.m. UTC 
Identifying a memory-to-memory video device through an ORed output and capture
capability flags is not reliable. Schedule this for removal.

Signed-off-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
---
 Documentation/feature-removal-schedule.txt |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

--
1.7.4.1

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diff mbox

Patch

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 09701af..950d84a 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -558,3 +558,17 @@  Why:	The V4L2_CID_VCENTER, V4L2_CID_HCENTER controls have been deprecated
 	There are newer controls (V4L2_CID_PAN*, V4L2_CID_TILT*) that provide
 	similar	functionality.
 Who:	Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
+
+----------------------------
+
+What:	Using V4L2_CAP_VIDEO_CAPTURE and V4L2_CAP_VIDEO_OUTPUT flags
+	to indicate a V4L2 memory-to-memory device capability
+When:	3.8
+Why:	New drivers should use new V4L2_CAP_VIDEO_M2M capability flag
+	to indicate a V4L2 video memory-to-memory (M2M) device and
+	applications can now identify a M2M video device by checking
+	for V4L2_CAP_VIDEO_M2M, with VIDIOC_QUERYCAP ioctl. Using ORed
+	V4L2_CAP_VIDEO_CAPTURE and V4L2_CAP_VIDEO_OUTPUT flags for M2M
+	devices is ambiguous and may lead, for example, to identifying
+	a M2M device as a video	capture or output device.
+Who:	Sylwester Nawrocki <sylvester.nawrocki@gmail.com>