linux-kernel - Re: [PATCH 1/2] dt-bindings: display: panel: add fannal,c3004

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Date:   Mon, 5 Jun 2023 16:56:13 +0200
From:   Paulo Pavacic <pavacic.p@...il.com>
To:     Conor Dooley <conor@...nel.org>
Cc:     neil.armstrong@...aro.org, sam@...nborg.org, airlied@...il.com,
        daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: display: panel: add fannal,c3004

Hello Conor,

pon, 5. lip 2023. u 16:43 Conor Dooley <conor@...nel.org> napisao je:
>
> On Mon, Jun 05, 2023 at 04:33:15PM +0200, Paulo Pavacic wrote:
> > Hello Conor,
> >
> > pet, 19. svi 2023. u 18:41 Conor Dooley <conor@...nel.org> napisao je:
> > >
> > > Hey Paulo,
> > >
> > > On Fri, May 19, 2023 at 04:24:55PM +0200, Paulo Pavacic wrote:
> > > >
> > > > Added fannal to vendor-prefixes and dt bindings for Fannal C3004.
> > > > Fannal C3004 is a 480x800 MIPI DSI Panel which requires
> > > > DCS initialization sequences with certain delays between certain
> > > > commands.
> > > >
> > > > Signed-off-by: Paulo Pavacic <pavacic.p@...il.com>
> > > > ---
> > > > v3 changelog:
> > > >   - renamed yml file
> > > >   - refactored yml file to describe fannal,c3004
> > > >   - added matrix URI to MAINTAINERS
> > > > v2 changelog:
> > > >   - revised driver title, now describes purpose
> > > >   - revised description, now describes hw
> > > >   - revised maintainers, now has only 1 mail
> > > >   - removed diacritics from commit/commit author
> > > >   - properties/compatible is now enum
> > > >   - compatible using only lowercase
> > > >   - revised dts example
> > > >   - modified MAINTAINERS in this commit (instead of driver commit)
> > > >   - dt_bindings_check checked yml
> > > >   - checkpatch warning fixed
> > > > ---
> > > >  .../bindings/display/panel/fannal,c3004.yaml  | 75 +++++++++++++++++++
> > > >  .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
> > > >  MAINTAINERS                                   |  6 ++
> > > >  3 files changed, 83 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/display/panel/fannal,c3004.yaml
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/display/panel/fannal,c3004.yaml b/Documentation/devicetree/bindings/display/panel/fannal,c3004.yaml
> > > > new file mode 100644
> > > > index 000000000000..a86b5ce02aa2
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/display/panel/fannal,c3004.yaml
> > > > @@ -0,0 +1,75 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/display/panel/fannal,c3004.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: Fannal C3004 MIPI-DSI
> > > > +
> > > > +maintainers:
> > > > +  - Paulo Pavacic <pavacic.p@...il.com>
> > > > +
> > > > +description: |
> > > > +  Fannal C3004 is a 480x800 panel which requires DSI DCS
> > > > +  initialization sequences.
> > > > +
> > > > +allOf:
> > > > +  - $ref: panel-common.yaml#
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    items:
> > > > +      - const: fannal,c3004
> > > > +
> > > > +  reg: true
> > >
> > > Are there no restrictions on the number of reg entries?
> >
> > What do you mean by this? May I have some example if possible?
>
> I was commenting on the lack of minItems and/or maxItems.

Sorry this is my first patch, I still don't understand, why should I
add `maxItems: 1` to the 'reg:' ?
Isn't  part of the code:
> required:
>  - compatible
>  - reg
>  - reset-gpios

making `minItems: 1` redundant for reg properties?

>
> Cheers,
> Conor.

Thanks,
Paulo