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Subject[PATCH v2] media: add a subsystem profile documentation
Document the basic policies of the media subsystem profile.

Signed-off-by: Mauro Carvalho Chehab <>

v2: fix the Documentation/*/media directories

Documentation/driver-api/media/index.rst | 2 +
.../media/maintainer-entry-profile.rst | 161 ++++++++++++++++++
.../maintainer/maintainer-entry-profile.rst | 1 +
3 files changed, 164 insertions(+)
create mode 100644 Documentation/driver-api/media/maintainer-entry-profile.rst

diff --git a/Documentation/driver-api/media/index.rst b/Documentation/driver-api/media/index.rst
index c140692454b1..2ad71dfa8828 100644
--- a/Documentation/driver-api/media/index.rst
+++ b/Documentation/driver-api/media/index.rst
@@ -28,6 +28,8 @@ Please see:
:maxdepth: 5

+ maintainer-entry-profile
diff --git a/Documentation/driver-api/media/maintainer-entry-profile.rst b/Documentation/driver-api/media/maintainer-entry-profile.rst
new file mode 100644
index 000000000000..6318be833bfb
--- /dev/null
+++ b/Documentation/driver-api/media/maintainer-entry-profile.rst
@@ -0,0 +1,161 @@
+Media Subsystem Profile
+The media subsystem covers support for a variety of devices: stream
+capture, analog and digital TV, cameras, remote controllers, HDMI CEC
+and media pipeline control.
+It covers, mainly, the contents of those directories:
+ - drivers/media
+ - drivers/staging/media
+ - Documentation/admin-guide/media
+ - Documentation/driver-api/media
+ - Documentation/userspace-api/media
+ - include/media
+Both media userspace and Kernel APIs are documented and should be kept in
+sync with the API changes. It means that all patches that add new
+features to the subsystem should also bring changes to the corresponding
+API files.
+Due to the size and wide scope of the media subsystem, media's
+maintainership model is to have sub-maintainers that have a broad
+knowledge of a specific aspect of the subsystem. It is the sub-maintainers'
+task to review the patches, providing feedback to users if the patches are
+following the subsystem rules and are properly using the media kernel and
+userspace APIs.
+Patches for the media subsystem should be sent to the media mailing list
+at as plain text only e-mail. Emails with
+HTML will be automatically rejected by the mail server. It could be wise
+to also copy the sub-maintainer(s).
+Media's workflow is heavily based on Patchwork, meaning that, once a patch
+is submitted, it should appear at:
+ -
+If it doesn't automatically appear there after a few minutes, then
+probably something got wrong on your submission. Please check if the
+email is in plain text only and if your emailer is not mangling with
+whitespaces before complaining or submitting them again.
+At the media subsystem, we have a group of experienced developers that
+are responsible for doing the code reviews at the drivers (called
+sub-maintainers), and another senior developer responsible for the
+subsystem as a hole. For core changes, whenever possible, multiple
+media (sub-)maintainers do the review.
+The sub-maintainers work on specific areas of the subsystem, as
+described below:
+Digital TV:
+ Sean Young <>
+ Hans Verkuil <>
+Media controller drivers:
+ Laurent Pinchart <>
+Remote Controllers:
+ Sean Young <>
+Sensor drivers:
+ Sakari Ailus <>
+V4L2 drivers:
+ Hans Verkuil <>
+Submit Checklist Addendum
+Patches that change the Open Firmware/Device Tree bindings should be
+reviewed by the Device Tree maintainers. So, DT maintainers should be
+c/c when those are submitted.
+There is a set of compliance tools at
+that should be used in order to check if the drivers are properly
+implementing the media APIs.
+Those tests need to pass before the patches go upstream.
+Also, please notice that we build the Kernel with::
+Where the check script is::
+ #!/bin/bash
+ /devel/smatch/smatch -p=kernel $@ >&2
+ /devel/sparse/sparse $@ >&2
+Be sure to not introduce new warnings on your patches without a
+very good reason.
+Style Cleanup Patches
+Style-cleanups are welcome when they come together with other changes
+at the files where the style changes will affect.
+We may accept pure standalone style-cleanups, but they should ideally
+be one patch for the hole subsystem (if the cleanup is low volume),
+or at least be grouped per directory. So, for example, if you're doing
+big cleanup change set at drivers under drivers/media, please send a single
+patch for all drivers under drivers/media/pci, another one for
+drivers/media/usb and so on.
+Coding Style Addendum
+Media development uses checkpatch on strict mode to verify the code style,
+e. g.::
+ $ ./script/ --strict
+Please notice that the goal here is to improve code readability. On a few
+cases, checkpatch may actually point to something that would look worse.
+So, you should use good send sense here, being prepared to justify any
+coding style decision.
+Please also notice that, on some cases, when you fix one issue, you may
+receive warnings about lines longer than 80 columns. It is fine to have
+longer lines if this means that other warnings will be fixed by that.
+Yet, if you're having more than 80 columns on a line, please consider
+simplifying the code - if too indented - or to use shorter names for
+Key Cycle Dates
+New submissions can be sent at any time, but if they intend to hit the
+next merge window they should be sent before -rc5, and ideally stabilized
+in the linux-media branch by -rc6.
+Review Cadence
+Provided that your patch is at, it should
+be sooner or later handled, so you don't need to re-submit a patch.
+Except for bug fixes, we don't usually add new patches to the development
+tree between -rc6 and the next -rc1.
+Please notice that the media subsystem is a high traffic one, so it
+could take a while for us to be able to review your patches. Feel free
+to ping if you don't get a feedback in a couple of weeks or to ask
+other developers to publicly add Reviewed-by and, more importantly,
+Tested-by tags.
+Please note that we expect a detailed description for Tested-by,
+identifying what boards were used at the test and what it was tested.
diff --git a/Documentation/maintainer/maintainer-entry-profile.rst b/Documentation/maintainer/maintainer-entry-profile.rst
index b7a627d6c97d..5d5cc3acdf85 100644
--- a/Documentation/maintainer/maintainer-entry-profile.rst
+++ b/Documentation/maintainer/maintainer-entry-profile.rst
@@ -102,3 +102,4 @@ to do something different in the near future.
+ ../driver-api/media/maintainer-entry-profile

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