Thread (18 messages) 18 messages, 6 authors, 2016-06-20

Re: [PATCH v2 2/4] mfd: cros_ec: add EC_PWM function definitions

From: Brian Norris <hidden>
Date: 2016-06-20 17:57:05
Also in: linux-pwm, lkml

Hi Lee,

On Mon, Jun 20, 2016 at 09:00:51AM +0100, Lee Jones wrote:
On Fri, 17 Jun 2016, Doug Anderson wrote:
quoted
On Fri, Jun 17, 2016 at 1:06 AM, Lee Jones [off-list ref] wrote:
quoted
quoted
Probably the reason for all of these non-kernel-isms is that this
isn't a kernel file.  From the top of the file:

 * NOTE: This file is copied verbatim from the ChromeOS EC Open Source
 * project in an attempt to make future updates easy to make.

So the source of truth for this file is
<https://chromium.googlesource.com/chromiumos/platform/ec/+/master/include/ec_commands.h>.

Someone could probably submit a CL to that project to make it a little
more kernel-ish and then we'd have to see if the EC team would accept
such changes...
Hmmm... that kinda puts me in a difficult position.  Do I except
non-kernel code, which does not conform to our stands?
What about if Brian made sure to just fully copy the latest version of
"cros_ec_commands.h" from the EC codebase and changed this commit
message to say:

Copy the latest version of "cros_ec_commands.h" from the Chrome OS EC
code base, which is the source of truth for this file.  See
<https://chromium.googlesource.com/chromiumos/platform/ec/+/master/include/ec_commands.h>.

From the commit message it would be clear that this is an external
file linked into the kernel for convenience.

quoted
Naturally I'd be happier if you could try to make the code more
'kernely'.  The practices I mention above are still good ones, even if
you're not writing kernel specific code.
In general requesting that code from outside the kernel conform to
"kerneldoc" seems like a bit of a stretch.  In general having some
type of parse-able format for comments is nice, but I could see that
in the Chrome OS EC codebase it would be a bit overkill.
It's unfortunate that kerneldoc is named so, since I think it's a nice
way to write structure/function headers regardless of code base and
not overkill at all.  It's certainly harder to convince !kernel code
to use the format, or at least easier for others to push back due to
the fact that is has 'kernel' in the name.
quoted
Also: it would be awfully strange if we suddenly started changing the
coding convention of this file or we had half the file in one
convention and half in another.  The rest of this file is in EC
convention and it seems sane to keep it that way...
Right.  It's also a shame we're only catching this now.  Really we
should have had this discussion in the first instance.
Well, I see your sign-off on 2 of 4 patches to this file :)
Taking into consideration that this file is already in the kernel and
that it's current format is also represented, I'm willing to keep
adding to it.
Thanks, that seems quite reasonable.
I would like to see an internal request to adopt
so-called kerneldoc.  Not because I am wish to blindly push our
standards to other code-bases, but because I am an advocate of the
format in general.
As mentioned in another branch of this thread, such a request has
already been made (and it's public, so feel free to follow if you're
so inclined):

https://bugs.chromium.org/p/chromium/issues/detail?id=621123

It seems as if the firmware authors have already agreed that adopting a
more consistent style like kerneldoc would be a net postive. So you
should expect to eventually see a patch to update this file. But in the
meantime, I think it would make things sanest if we update the file
incrementally until that is done.

Regards,
Brian
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