linux-kernel - Re: [PATCH] [media] tvp5150: remove signal generator as input from the DT binding

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Message-ID: <4247934.WAaViM8cSf@avalon>
Date:	Tue, 23 Feb 2016 20:28:14 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	devicetree@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH] [media] tvp5150: remove signal generator as input from the DT binding

Hi Javier,

On Tuesday 23 February 2016 15:23:48 Javier Martinez Canillas wrote:
> On 02/23/2016 03:02 PM, Laurent Pinchart wrote:
> > On Tuesday 23 February 2016 13:27:51 Javier Martinez Canillas wrote:
> >> On 02/23/2016 01:16 PM, Laurent Pinchart wrote:
> >>> On Tuesday 23 February 2016 13:09:58 Javier Martinez Canillas wrote:
> >>>> The chip internal signal generator was modelled as an input connector
> >>>> and represented as a media entity but isn't really a connector so the
> >>>> driver was changed to use the V4L2_CID_TEST_PATTERN control instead.
> >>>> 
> >>>> Remove the signal generator input from the list of connectors in the
> >>>> tvp5150 DT binding document as well since isn't a connector anymore.
> >>>> 
> >>>> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> >>>> 
> >>>> ---
> >>>> Hello,
> >>>> 
> >>>> I think is OK to change this DT binding because is only in the media
> >>>> tree for now and not in mainline yet and also is expected to change
> >>>> more since there are still discussions about how input connectors will
> >>>> be supported by the Media Controller framework in the media subsystem.
> >>> 
> >>> I think that's fine, yes
> >>> 
> >>> Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> >> 
> >> Thanks.
> >> 
> >>> I haven't noticed the patch that introduced this early enough I'm
> >>> afraid, and I think we still have issues with those bindings.
> >> 
> >> Yes, I posted those patches and got merged before we had the discussion
> >> about input connectors over IRC so I didn't know what was the correct way
> >> to do it.
> >> 
> >>> The tvp5150 node should *not* contain connector subnodes, the connectors
> >>> nodes should use the bindings defined in
> >>> Documentation/devicetree/bindings/display/connector/ and be linked to
> >>> the tvp5150 node using the OF graph bindings (ports and endpoints).
> >> 
> >> Agreed.
> >> 
> >>> Do you think you could fix that ?
> >> 
> >> Yes I will, I'm waiting for the input connectors discussions to settle so
> >> I can post a final version of the DT bindings following what is agreed by
> >> all.
> >
> > Shouldn't we revert the patch that introduced connectors support in the DT
> > bindings in the meantime then, to avoid known to be broken bindings from
> > hitting mainline in case we can't fix them in time for v4.6 ?
> 
> Yes, that would be a good idea. I've seen recently though a DT binding doc
> that was marked as unstable / work in progress and I wonder if that's a new
> accepted convention for DT binding docs or is just something that slipped
> through review.

I'm not sure if it's an established practice but I certainly like it. However, 
in this specific case, we know that the bindings are broken, so I think a 
revert would be better.

> The commit I'm talking about is f07b4e49d27e ("Documentation: bindings:
> berlin: consider our dt bindings as unstable") but I don't see anything
> documented in Documentation/devicetree/bindings/ABI.txt.
> 
> In any case, I'm fine with either marking the DT binding doc as unstable or
> to revert the patch that added the connectors portion to the tvp5150 DT
> binding.


-- 
Regards,

Laurent Pinchart