linux-kernel - Re: [RESEND PATCH] partial revert of "[media] tvp5150: add HW input connectors support"

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Date:   Thu, 14 Dec 2017 16:08:15 -0200
From:   Mauro Carvalho Chehab <mchehab@...nel.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        linux-media@...r.kernel.org
Subject: Re: [RESEND PATCH] partial revert of "[media] tvp5150: add HW input
 connectors support"

Em Thu, 14 Dec 2017 18:37:30 +0100
Javier Martinez Canillas <javierm@...hat.com> escreveu:

> Hello Mauro,
> 
> On 12/14/2017 06:02 PM, Mauro Carvalho Chehab wrote:
> > Em Wed,  6 Dec 2017 01:33:05 +0100
> > Javier Martinez Canillas <javierm@...hat.com> escreveu:
> >   
> >> Commit f7b4b54e6364 ("[media] tvp5150: add HW input connectors support")
> >> added input signals support for the tvp5150, but the approach was found
> >> to be incorrect so the corresponding DT binding commit 82c2ffeb217a
> >> ("[media] tvp5150: document input connectors DT bindings") was reverted.
> >>
> >> This left the driver with an undocumented (and wrong) DT parsing logic,
> >> so lets get rid of this code as well until the input connectors support
> >> is implemented properly.
> >>
> >> It's a partial revert due other patches added on top of mentioned commit
> >> not allowing the commit to be reverted cleanly anymore. But all the code
> >> related to the DT parsing logic and input entities creation are removed.
> >>
> >> Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> >> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> >> Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>  
> >   
> >>
> >> ---
> >>
> >> This patch was posted about a year ago but was never merged:
> >>
> >> https://patchwork.kernel.org/patch/9472623/  
> > 
> > It was a RFT, on that time.
> >   
> 
> Yes, sorry if it sounded as if I was complaining. I was just mentioning and
> part of the patch falling through the cracks is that I also forgot about it.
> 
> > I guess I told that before. Maybe not. Anyway, reverting it doesn't seem 
> > to be the proper fix, as it will break support for existing devices, by
> > removing functionality from tvp5150 driver. You should remind that, since
> > the code was added, someone could be already using it, as all it is  
> 
> I'm not sure about this. What I'm removing is basically dead code (unless
> someone is using an undocumented Device Tree binding), since the DT binding
> got already removed by commit 31e717dba1e1 ("[media] Revert "[media] tvp5150:
> document input connectors DT bindings").
> 
> > needed is to have some dtb. Also, it gets rid of a lot of good work for
> > no good reason. Reinserting them later while preserving the code
> > copyrights could be painful.
> >  
> 
> I would normally agree with you, although I think that in this particular case
> is better to just revert this (unused) code for the reasons I mentioned above.
> 
> But don't really have a strong opinion on this, so I'm OK with either approach.
> 
> > IMHO, the best here is to move ahead, agreeing with a DT structure
> > that represents the connectors and then change the driver to
> > implement it, if needed.
> >  
> 
> There was some agreement on the DT binding, it's just that I never found time
> to implement the logic in the driver. Let's see if I can get some during the
> winter holidays and finally fix this.

Ok. This was pending for a long time to be touched. Waiting for a couple
of weeks for a final solution seems worth.

If you can't do that, by then, please ping us for us to seek for an
alternative way to move forward.



Thanks,
Mauro