[v2] media: add a subsystem profile documentation

Commit Message

Mauro Carvalho Chehab Sept. 18, 2019, 1:59 p.m. UTC

Document the basic policies of the media subsystem profile.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
---
 Documentation/media/index.rst                 |   1 +
 .../media/maintainer-entry-profile.rst        | 157 ++++++++++++++++++
 MAINTAINERS                                   |   1 +
 3 files changed, 159 insertions(+)
 create mode 100644 Documentation/media/maintainer-entry-profile.rst

Comments

André Almeida Sept. 18, 2019, 2:07 p.m. UTC | #1

Hello Mauro,

On 9/18/19 10:59 AM, Mauro Carvalho Chehab wrote:
> Document the basic policies of the media subsystem profile.
> 
> Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
> ---
>  Documentation/media/index.rst                 |   1 +
>  .../media/maintainer-entry-profile.rst        | 157 ++++++++++++++++++
>  MAINTAINERS                                   |   1 +
>  3 files changed, 159 insertions(+)
>  create mode 100644 Documentation/media/maintainer-entry-profile.rst
> 
> diff --git a/Documentation/media/index.rst b/Documentation/media/index.rst
> index 0301c25ff887..ac94685b822a 100644
> --- a/Documentation/media/index.rst
> +++ b/Documentation/media/index.rst
> @@ -12,6 +12,7 @@ Linux Media Subsystem Documentation
>  .. toctree::
>     :maxdepth: 2
>  
> +   maintainer-entry-profile
>     media_uapi
>     media_kapi
>     dvb-drivers/index
> diff --git a/Documentation/media/maintainer-entry-profile.rst b/Documentation/media/maintainer-entry-profile.rst
> new file mode 100644
> index 000000000000..68d642abe2c1
> --- /dev/null
> +++ b/Documentation/media/maintainer-entry-profile.rst
> @@ -0,0 +1,157 @@
> +Media Subsystem Profile
> +=======================
> +
> +Overview
> +--------
> +
> +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/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.
> +
> +Also, patches that changes the Open Firmware/Device Tree bindings should
> +also be reviewed by the Device Tree maintainers.
> +
> +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 an specific aspect of the subsystem. It is a
> +sub-maintainer's task to review the patches, providing feedback to users
> +if the patches are following the subsystem rules and are properly using
> +the media internal and external APIs.
> +
> +Patches for the media subsystem should be sent to the media mailing list
> +at [e-mail] 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:
> +
> +   - https://patchwork.linuxtv.org/project/linux-media/list/
> +
> +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 submit it again.
> +
> +Sub-maintainers
> ++++++++++++++++

What is the motivation for using "+++" instead of "---"?

> +
> +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 <[e-mail]>
> +
> +HDMI CEC:
> +  Hans Verkuil <[e-mail]>
> +
> +Media controller drivers:
> +  Laurent Pinchart <[e-mail]>
> +
> +Remote Controllers:
> +  Sean Young <[e-mail]>
> +
> +Sensor drivers:
> +  Sakari Ailus <[e-mail]>
> +
> +V4L2 drivers:
> +  Hans Verkuil <[e-mail]>
> +
> +Submit Checklist Addendum
> +-------------------------
> +
> +There is a set of compliance tools at https://git.linuxtv.org/v4l-utils.git/
> +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::
> +
> +	make CF=-D__CHECK_ENDIAN__ CONFIG_DEBUG_SECTION_MISMATCH=y C=1 W=1 CHECK=check_script
> +
> +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.
> +
> +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.
> +
> +Coding Style Addendum
> +---------------------
> +
> +Media development uses checkpatch on strict mode to verify the code style, e. g.::
> +
> +	$ ./script/checkpatch.pl --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 idented - or to use shorter names for
> +variables.
> +
> +Review Cadence
> +--------------
> +
> +Provided that your patch is at https://patchwork.linuxtv.org, 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.
> +
> +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 changes 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.
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7c62b45201d7..e7f44ec05a42 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10077,6 +10077,7 @@ W:	https://linuxtv.org
>  Q:	http://patchwork.kernel.org/project/linux-media/list/
>  T:	git git://linuxtv.org/media_tree.git
>  S:	Maintained
> +P:	Documentation/media/maintainer-entry-profile.rst
>  F:	Documentation/devicetree/bindings/media/
>  F:	Documentation/media/
>  F:	drivers/media/
>

Mauro Carvalho Chehab Sept. 18, 2019, 2:11 p.m. UTC | #2

Em Wed, 18 Sep 2019 11:07:16 -0300
André Almeida <[e-mail]> escreveu:

> Hello Mauro,
> 
> On 9/18/19 10:59 AM, Mauro Carvalho Chehab wrote:
> > Document the basic policies of the media subsystem profile.
> > 
> > Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
> > ---
> >  Documentation/media/index.rst                 |   1 +
> >  .../media/maintainer-entry-profile.rst        | 157 ++++++++++++++++++
> >  MAINTAINERS                                   |   1 +
> >  3 files changed, 159 insertions(+)
> >  create mode 100644 Documentation/media/maintainer-entry-profile.rst
> > 
> > diff --git a/Documentation/media/index.rst b/Documentation/media/index.rst
> > index 0301c25ff887..ac94685b822a 100644
> > --- a/Documentation/media/index.rst
> > +++ b/Documentation/media/index.rst
> > @@ -12,6 +12,7 @@ Linux Media Subsystem Documentation
> >  .. toctree::
> >     :maxdepth: 2
> >  
> > +   maintainer-entry-profile
> >     media_uapi
> >     media_kapi
> >     dvb-drivers/index
> > diff --git a/Documentation/media/maintainer-entry-profile.rst b/Documentation/media/maintainer-entry-profile.rst
> > new file mode 100644
> > index 000000000000..68d642abe2c1
> > --- /dev/null
> > +++ b/Documentation/media/maintainer-entry-profile.rst
> > @@ -0,0 +1,157 @@
> > +Media Subsystem Profile
> > +=======================
> > +
> > +Overview
> > +--------
> > +
> > +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/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.
> > +
> > +Also, patches that changes the Open Firmware/Device Tree bindings should
> > +also be reviewed by the Device Tree maintainers.
> > +
> > +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 an specific aspect of the subsystem. It is a
> > +sub-maintainer's task to review the patches, providing feedback to users
> > +if the patches are following the subsystem rules and are properly using
> > +the media internal and external APIs.
> > +
> > +Patches for the media subsystem should be sent to the media mailing list
> > +at [e-mail] 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:
> > +
> > +   - https://patchwork.linuxtv.org/project/linux-media/list/
> > +
> > +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 submit it again.
> > +
> > +Sub-maintainers
> > ++++++++++++++++  
> 
> What is the motivation for using "+++" instead of "---"?

Just cosmetics.

This chapter doesn't exist at the original profile, as sub-maintainers,
co-maintainers, etc. are used only on a few subsystems. 

So, I'm adding it as a sub-chapter.

Thanks,
Mauro

Patch

diff --git a/Documentation/media/index.rst b/Documentation/media/index.rst
index 0301c25ff887..ac94685b822a 100644
--- a/Documentation/media/index.rst
+++ b/Documentation/media/index.rst
@@ -12,6 +12,7 @@  Linux Media Subsystem Documentation
 .. toctree::
    :maxdepth: 2
 
+   maintainer-entry-profile
    media_uapi
    media_kapi
    dvb-drivers/index
diff --git a/Documentation/media/maintainer-entry-profile.rst b/Documentation/media/maintainer-entry-profile.rst
new file mode 100644
index 000000000000..68d642abe2c1
--- /dev/null
+++ b/Documentation/media/maintainer-entry-profile.rst
@@ -0,0 +1,157 @@ 
+Media Subsystem Profile
+=======================
+
+Overview
+--------
+
+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/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.
+
+Also, patches that changes the Open Firmware/Device Tree bindings should
+also be reviewed by the Device Tree maintainers.
+
+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 an specific aspect of the subsystem. It is a
+sub-maintainer's task to review the patches, providing feedback to users
+if the patches are following the subsystem rules and are properly using
+the media internal and external APIs.
+
+Patches for the media subsystem should be sent to the media mailing list
+at [e-mail] 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:
+
+   - https://patchwork.linuxtv.org/project/linux-media/list/
+
+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 submit it again.
+
+Sub-maintainers
++++++++++++++++
+
+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 <[e-mail]>
+
+HDMI CEC:
+  Hans Verkuil <[e-mail]>
+
+Media controller drivers:
+  Laurent Pinchart <[e-mail]>
+
+Remote Controllers:
+  Sean Young <[e-mail]>
+
+Sensor drivers:
+  Sakari Ailus <[e-mail]>
+
+V4L2 drivers:
+  Hans Verkuil <[e-mail]>
+
+Submit Checklist Addendum
+-------------------------
+
+There is a set of compliance tools at https://git.linuxtv.org/v4l-utils.git/
+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::
+
+	make CF=-D__CHECK_ENDIAN__ CONFIG_DEBUG_SECTION_MISMATCH=y C=1 W=1 CHECK=check_script
+
+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.
+
+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.
+
+Coding Style Addendum
+---------------------
+
+Media development uses checkpatch on strict mode to verify the code style, e. g.::
+
+	$ ./script/checkpatch.pl --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 idented - or to use shorter names for
+variables.
+
+Review Cadence
+--------------
+
+Provided that your patch is at https://patchwork.linuxtv.org, 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.
+
+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 changes 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.
diff --git a/MAINTAINERS b/MAINTAINERS
index 7c62b45201d7..e7f44ec05a42 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10077,6 +10077,7 @@  W:	https://linuxtv.org
 Q:	http://patchwork.kernel.org/project/linux-media/list/
 T:	git git://linuxtv.org/media_tree.git
 S:	Maintained
+P:	Documentation/media/maintainer-entry-profile.rst
 F:	Documentation/devicetree/bindings/media/
 F:	Documentation/media/
 F:	drivers/media/