linux-kernel - Re: [PATCH v2 06/15] dt-bindings: display: Convert dlc,dlc0700yzg-1 panel to DT schema

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Message-ID: <CAL_Jsq+OgNgS7yVgZaVLEo6=OeS9R9ebgBpUbPxz609C7G9oOw@mail.gmail.com>
Date:   Tue, 25 Jun 2019 08:15:18 -0600
From:   Rob Herring <robh@...nel.org>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v2 06/15] dt-bindings: display: Convert dlc,dlc0700yzg-1
 panel to DT schema

On Tue, Jun 25, 2019 at 1:55 AM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> Hi,
>
> On Mon, Jun 24, 2019 at 03:56:40PM -0600, Rob Herring wrote:
> > Convert the dlc,dlc0700yzg-1 panel binding to DT schema.
> >
> > Cc: Philipp Zabel <p.zabel@...gutronix.de>
> > Cc: Thierry Reding <thierry.reding@...il.com>
> > Cc: Sam Ravnborg <sam@...nborg.org>
> > Cc: Maxime Ripard <maxime.ripard@...tlin.com>
> > Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Cc: dri-devel@...ts.freedesktop.org
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> >  .../display/panel/dlc,dlc0700yzg-1.txt        | 13 ---------
> >  .../display/panel/dlc,dlc0700yzg-1.yaml       | 28 +++++++++++++++++++
> >  2 files changed, 28 insertions(+), 13 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/display/panel/dlc,dlc0700yzg-1.txt
> >  create mode 100644 Documentation/devicetree/bindings/display/panel/dlc,dlc0700yzg-1.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/display/panel/dlc,dlc0700yzg-1.txt b/Documentation/devicetree/bindings/display/panel/dlc,dlc0700yzg-1.txt
> > deleted file mode 100644
> > index bf06bb025b08..000000000000
> > --- a/Documentation/devicetree/bindings/display/panel/dlc,dlc0700yzg-1.txt
> > +++ /dev/null
> > @@ -1,13 +0,0 @@
> > -DLC Display Co. DLC0700YZG-1 7.0" WSVGA TFT LCD panel
> > -
> > -Required properties:
> > -- compatible: should be "dlc,dlc0700yzg-1"
> > -- power-supply: See simple-panel.txt
> > -
> > -Optional properties:
> > -- reset-gpios: See panel-common.txt
> > -- enable-gpios: See simple-panel.txt
> > -- backlight: See simple-panel.txt
> > -
> > -This binding is compatible with the simple-panel binding, which is specified
> > -in simple-panel.txt in this directory.
> > diff --git a/Documentation/devicetree/bindings/display/panel/dlc,dlc0700yzg-1.yaml b/Documentation/devicetree/bindings/display/panel/dlc,dlc0700yzg-1.yaml
> > new file mode 100644
> > index 000000000000..1b0b63d46f3e
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/panel/dlc,dlc0700yzg-1.yaml
> > @@ -0,0 +1,28 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/display/panel/dlc,dlc0700yzg-1.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: DLC Display Co. DLC0700YZG-1 7.0" WSVGA TFT LCD panel
> > +
> > +maintainers:
> > +  - Philipp Zabel <p.zabel@...gutronix.de>
> > +  - Thierry Reding <thierry.reding@...il.com>
> > +
> > +allOf:
> > +  - $ref: panel-common.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    const: dlc,dlc0700yzg-1
> > +
> > +  reset-gpios: true
> > +  enable-gpios: true
> > +  backlight: true
>
> Do we need to list them?
>
> Since we don't have additionalItems, it doesn't really change anything
> since it will be validated by panel-common.

I've gone back and forth on it. I think we need to express what
properties from the common properties apply for a particular panel.
I've been requiring panel bindings to be explicit here rather than
just say "uses the simple-panel binding." For example, if
'power-supply' is not listed, does the panel have a single supply or
multiple supplies that haven't haven't been considered?

> Either way, it should be consistent between your patches, and the
> previous patches in this series didn't list all the properties in the
> binding.

Indeed.

Rob