linux-kernel - Re: [PATCH v2 1/5] dt-bindings: connector: add GE SUNH hotplug addon connector

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Date: Fri, 10 May 2024 08:22:53 -0500
From: Rob Herring <robh@...nel.org>
To: Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
	Dragan Cvetic <dragan.cvetic@....com>, Maxime Ripard <mripard@...nel.org>, 
	Andrzej Hajda <andrzej.hajda@...el.com>, Paul Kocialkowski <paul.kocialkowski@...tlin.com>, 
	Robert Foss <rfoss@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Hervé Codina <herve.codina@...tlin.com>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Arnd Bergmann <arnd@...db.de>, Derek Kiernan <derek.kiernan@....com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Saravana Kannan <saravanak@...gle.com>, 
	David Airlie <airlied@...il.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Paul Kocialkowski <contact@...lk.fr>, devicetree@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, Thomas Zimmermann <tzimmermann@...e.de>, 
	linux-kernel@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>, 
	Jonas Karlman <jonas@...boo.se>, Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 1/5] dt-bindings: connector: add GE SUNH hotplug addon connector

On Fri, May 10, 2024 at 5:37 AM Luca Ceresoli <luca.ceresoli@...tlin.com> wrote:
>
> Hello Rob,
>
> On Fri, 10 May 2024 03:41:35 -0500
> "Rob Herring (Arm)" <robh@...nel.org> wrote:
>
> > On Fri, 10 May 2024 09:10:37 +0200, Luca Ceresoli wrote:
> > > Add bindings for the GE SUNH add-on connector. This is a physical,
> > > hot-pluggable connector that allows to attach and detach at runtime an
> > > add-on adding peripherals on non-discoverable busses.
> > >
> > > Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
> > >
> > > ---
> > >
> > > NOTE: the second and third examples fail 'make dt_binding_check' because
> > >       they are example of DT overlay code -- I'm not aware of a way to
> > >       validate overlay examples as of now
>
> As mentioned here...
>
> > >
> > > This patch is new in v2.
> > > ---
> > >  .../connector/ge,sunh-addon-connector.yaml         | 197 +++++++++++++++++++++
> > >  MAINTAINERS                                        |   5 +
> > >  2 files changed, 202 insertions(+)
> > >
> >
> > My bot found errors running 'make dt_binding_check' on your patch:
> >
> > yamllint warnings/errors:
> >
> > dtschema/dtc warnings/errors:
> > Error: Documentation/devicetree/bindings/connector/ge,sunh-addon-connector.example.dts:49.9-14 syntax error
> > FATAL ERROR: Unable to parse input tree
>
> ...this is expected.
>
> Any hints on how this can be managed in bindings examples would be very
> useful.

Overlays in examples are not supported. Add actual .dtso files if you
want examples of overlays (maybe you did, shrug).

Overlays are somewhat orthogonal to bindings. Bindings define the ABI.
It only makes sense to validate applied overlays. Now maybe overlays
contain complete nodes and we could validate those, but that's a
problem for actual overlay files and not something we need to
complicate examples with.

Rob