linux-kernel - Re: [PATCH v2 2/5] dt-bindings: panel: add binding for Xingbangda XBD599 panel

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Date:   Thu, 19 Mar 2020 15:14:27 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Ondrej Jirman <megous@...ous.com>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v2 2/5] dt-bindings: panel: add binding for Xingbangda
 XBD599 panel

Hi Icenowy,

On Mon, Mar 16, 2020 at 2:37 PM Icenowy Zheng <icenowy@...c.io> wrote:

> Xingbangda XBD599 is a 5.99" 720x1440 MIPI-DSI LCD panel.
>
> Add its device tree binding.
>
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
(...)

> +properties:
> +  compatible:
> +    const: xingbangda,xbd599

As noticed in the review of the driver, this display is very close to
himax,hx8363.

I think the best is to determin what actual display controller it is,
I think it is some kind of Ilitek controller since Ilitek ili9342 is
clearly very similar.

The best would be something like name the bindings
ilitek-ili9342.yaml and then:

properties:
  compatible:
    items:
      - const: xingbangda,xbd599
      - const: ilitek,ili9342

Possibly use oneOf and add support for the himax,hx8363
already while you're at it.

Yours,
Linus Walleij