linux-kernel - Re: [PATCH v2 1/2] dt-bindings: display/panel: Add Lenovo NT36523W BOE panel

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Message-ID: <aa963fa9-e2d6-a7e1-8396-745de5f996d4@linaro.org>
Date:   Wed, 8 Mar 2023 12:02:48 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Jianhua Lu <lujianhua000@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, phone-devel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: display/panel: Add Lenovo NT36523W
 BOE panel



On 7.03.2023 23:08, Linus Walleij wrote:
> On Tue, Mar 7, 2023 at 2:26 PM Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
> 
>> Add bindings for the 2000x1200px IPS panel found on Lenovo Tab P11/
>> XiaoXin Pad devices.
>>
>> Reviewed-by: Rob Herring <robh@...nel.org>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> 
> (...)
>> +$id: http://devicetree.org/schemas/display/panel/lenovo,nt36523w-boe-j606.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: NT36523W BOE panel found on Lenovo J606 devices
> 
> It's a Novatek NT36523 display controller-based device isn't it?
> 
> I would reflect that in the title or at least the description.
> 
>> +
>> +maintainers:
>> +  - Konrad Dybcio <konrad.dybcio@...aro.org>
>> +
>> +allOf:
>> +  - $ref: panel-common.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: lenovo,nt36523w-boe-j606
>> +
>> +  reg:
>> +    maxItems: 1
>> +    description: DSI virtual channel
>> +
>> +  vddio-supply: true
>> +  reset-gpios: true
>> +  rotation: true
>> +  port: true
> 
> This is clearly (as can be seen from the magic in the driver) a
> Novatek NT36523 display controller, just configured differently.
> https://lore.kernel.org/lkml/20230220121258.10727-1-lujianhua000@gmail.com/T/
> 
> Why can't you just modify the existing nt36523 binding from
> Jianhua Lu by e.g. making these two non-required:
> 
>  - vddpos-supply
>  - vddneg-supply
> 
> It would not be helpful for driver writers to have two different bindings
> for similar hardware hand having to write code to handle different
> properties depending on which binding is used, so please unify into
> one binding by cooperating with Jianhua.
I'll look into Jianhua's patchset and try to work atop that!

> 
> Would it help if we merged Jianhua's binding so you can build on topYes please, the less out-of-tree dependencies the better..

> 
> Yours,
> Linus Walleij