linux-kernel - Re: Adding ABI to htmldocs - Was: Re: [PATCH 2/2] w1: w1_therm: Add support for GXCAS GX20MH01 device.

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Date:   Wed, 21 Oct 2020 18:58:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Ivan Zaentsev <ivan.zaentsev@...enboard.ru>,
        Evgeniy Polyakov <zbr@...emap.net>,
        Jonathan Corbet <corbet@....net>,
        Akira Shimahara <akira215corp@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Colin Ian King <colin.king@...onical.com>,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Evgeny Boger <boger@...enboard.com>
Subject: Re: Adding ABI to htmldocs - Was: Re: [PATCH 2/2] w1: w1_therm: Add
 support for GXCAS GX20MH01 device.

On Wed, Oct 21, 2020 at 06:28:43PM +0200, Mauro Carvalho Chehab wrote:
> Hi greg,
> 
> Em Wed, 7 Oct 2020 13:59:34 +0200
> Mauro Carvalho Chehab <mchehab+huawei@...nel.org> escreveu:
> 
> > Em Wed, 7 Oct 2020 13:43:59 +0200
> > Greg Kroah-Hartman <gregkh@...uxfoundation.org> escreveu:
> > 
> > > On Wed, Oct 07, 2020 at 01:05:49PM +0200, Mauro Carvalho Chehab wrote:  
> > > > Em Wed, 7 Oct 2020 11:06:19 +0200
> > > > Greg Kroah-Hartman <gregkh@...uxfoundation.org> escreveu:
> > > >     
> > > > > On Wed, Oct 07, 2020 at 10:57:02AM +0200, Mauro Carvalho Chehab wrote:    
> > > > > > Em Wed, 7 Oct 2020 10:32:27 +0300
> > > > > > Ivan Zaentsev <ivan.zaentsev@...enboard.ru> escreveu:
> > > > > >       
> > > > > > > Tuesday, October 6, 2020, 4:19:15 PM, Mauro Carvalho Chehab wrote:
> > > > > > >       
> > > > > > > >> diff --git a/Documentation/w1/slaves/w1_therm.rst b/Documentation/w1/slaves/w1_therm.rst
> > > > > > > >> index f1148181f53e..00376501a5ef 100644
> > > > > > > >> --- a/Documentation/w1/slaves/w1_therm.rst
> > > > > > > >> +++ b/Documentation/w1/slaves/w1_therm.rst        
> > > > > > >       
> > > > > > > >>  
> > > > > > > >> @@ -130,4 +131,12 @@ conversion and temperature reads 85.00 (powerup value) or 127.94 (insufficient
> > > > > > > >>  power), the driver returns a conversion error. Bit mask ``2`` enables poll for
> > > > > > > >>  conversion completion (normal power only) by generating read cycles on the bus
> > > > > > > >>  after conversion starts. In parasite power mode this feature is not available.
> > > > > > > >> -Feature bit masks may be combined (OR).
> > > > > > > >> +Feature bit masks may be combined (OR). See accompanying sysfs documentation:
> > > > > > > >> +:ref:`Documentation/w1/slaves/w1_therm.rst <w1_therm>`
> > > > > > > >> +        
> > > > > > >       
> > > > > > > > As warned by Sphinx, this cross-reference is broken:        
> > > > > > >       
> > > > > > > >         .../Documentation/w1/slaves/w1_therm.rst:125: WARNING:
> > > > > > > > undefined label: w1_therm (if the link has no caption the label must precede a section header)        
> > > > > > > 
> > > > > > > Would this be ok?      
> > > > > > 
> > > > > > Yeah, sure!
> > > > > >       
> > > > > > > 
> > > > > > > "More details in Documentation/ABI/testing/sysfs-driver-w1_therm"
> > > > > > >       
> > > > > > > > Not sure what you wanted to point here.        
> > > > > > > 
> > > > > > > A link to a driver's sysfs interface, but sysfs docs are text
> > > > > > > files and seem to not be included in Sphynx Docs.      
> > > > > > 
> > > > > > I sent upstream sometime ago a patch series adding ABI to Sphinx, but I 
> > > > > > was not merged, not sure why:
> > > > > > 
> > > > > > 	https://git.linuxtv.org/mchehab/experimental.git/log/?h=abi_patches_v5.6      
> > > > > 
> > > > > I think the raft of different patches floating around at the time made
> > > > > me totally confused as to what was, and was not, the latest versions.    
> > > > 
> > > > Yeah, there were lots of patches floating around that time.
> > > > 
> > > > I also recall that someone (Jeni?) asked if the best wouldn't be to
> > > > just convert the ABI files to ReST directly.
> > > >     
> > > > > I'll be glad to look at them again, if you want to rebase after 5.10-rc1
> > > > > is out and resend them, as I think this should be showing up in the
> > > > > documentation.    
> > > > 
> > > > Surely. I'll rebase them after 5.10-rc1 and re-submit. 
> > > > 
> > > > What strategy do you prefer? Keep the files with the same format as
> > > > today (allowing them to optionally have ReST markups) or to convert
> > > > them to .rst directly?
> > > > 
> > > > In the latter case, the best would be to apply it as early as possible
> > > > after 5.10-rc1, as it may cause conflicts with other patches being
> > > > submitted for 5.11.    
> > > 
> > > The existing format if at all possible, doing wholesale changes is a
> > > mess and wouldn't be recommended.  
> > 
> > Yeah, merging it would indeed be a mess. At long term, though, it could 
> > be easier to maintain.
> > 
> > > I think you already fixed up the entries that had problems being parsed
> > > in the past, if not, we can resolve those as well.  
> > 
> > Yes. The series start with fixes. I suspect several of them
> > (if not all) were already merged, but if anything is missing, I can fix 
> > at the upcoming rebased series.
> 
> Rebasing the patch series was easier than what I expected:
> 
> 	https://git.linuxtv.org/mchehab/experimental.git/log/?h=abi_patches_v6
> 
> Yet, while fixing one build issue, I noticed that there are multiple
> files defining the same ABI, with different contents.
> 
> Right now, scripts/get_abi.pl assumes that "what" is unique. Well, sorts
> of. When it finds a duplicated entry, it merges the description, 
> preserving the fields from the last parsed entry.
> 
> I ended adding a patch to detect those ABI duplication:
> 
> 	https://git.linuxtv.org/mchehab/experimental.git/commit/?h=abi_patches_v6&id=6868914605cb0ebffe3fd07d344c246e1e4cd94e
> 
> I'm enclosing the results.
> 
> One such example is this one:
> 
> 	3 duplicated entries for /sys/class/leds/<led>/hw_pattern: on file(s) sysfs-class-led-trigger-pattern sysfs-class-led-driver-sc27xx sysfs-class-led-driver-el15203000
> 
> It sounds that different drivers define and use this ABI, but
> each one with different meanings. 
> 
> There are even some cases where the same file define the same ABI twice:
> 
> 	2 duplicated entries for /sys/class/power_supply/<supply_name>/temp_alert_min: on file(s) sysfs-class-power
> 
> Not sure what's the best way to document things like that, or if
> the fix would be to drop/merge those.
> 
> Any ideas?

We should merge them to be the correct representation.  The
driver-specific ones for LED should just be dropped to use the
class-generic one.

I guess just take them one at a time :)

thanks,

greg k-h