linux-kernel - Re: [PATCH v2 2/4] drm/panel: Add driver for DJN HX83112A LCD panel

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Date: Wed, 14 Feb 2024 10:50:21 +0100
From: neil.armstrong@...aro.org
To: Luca Weiss <luca.weiss@...rphone.com>,
 Linus Walleij <linus.walleij@...aro.org>
Cc: Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg
 <sam@...nborg.org>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Andy Gross <agross@...nel.org>,
 devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] drm/panel: Add driver for DJN HX83112A LCD panel

On 14/02/2024 10:33, Luca Weiss wrote:
> On Mon Jan 22, 2024 at 12:27 PM CET, Luca Weiss wrote:
>> On Fri Jan 12, 2024 at 11:26 AM CET,  wrote:
>>> On 12/01/2024 11:23, Linus Walleij wrote:
>>>> On Fri, Jan 12, 2024 at 10:52 AM Luca Weiss <luca.weiss@...rphone.com> wrote:
>>>>
>>>>> Since there's zero indication Truly is involved in this panel in my
>>>>> documentation - much less the number 5P65 - I'm not going to add that.
>>>
>>> Ack
>>>
>>>>
>>>> OK then, I fold, thanks for looking into it.
>>>> Keep the Himax hx83112a file name and symbols.
>>>>
>>>>> So in short this panel is the model 9A-3R063-1102B from DJN, which uses
>>>>> a Himax HX83112A driver IC.
>>>>
>>>> So compatible = "djn,9a-3r063-1102b" since the setup sequences for
>>>> hx83112a are clearly for this one display?
>>>
>>> Yep let's settle on that!
>>
> 
> Hi Neil and Linus,
> 
> Any feedback about the below question?
> 
> Regards
> Luca
> 
>> It's clear to me to use "djn,9a-3r063-1102b" in the driver now but what
>> about dts?
>>
>> Currently here in v2 we have this:
>> compatible = "fairphone,fp4-hx83112a-djn", "himax,hx83112a";
>>
>> Should this just become this?
>> compatible = "djn,9a-3r063-1102b";
>>
>> Or e.g. this?
>> compatible = "djn,9a-3r063-1102b", "himax,hx83112a";
>>
>> Or something else completely? Do we have some documentation / best
>> practises around this maybe?

Sorry I totally missed the question.

Not sure if "himax,hx83112a" is needed here, the "djn,9a-3r063-1102b" is enough to know the IC is hx83112a.

I don't think you'll ever find a "djn,9a-3r063-1102b" with another controller IC ?

And "himax,hx83112a" alone as fallback is not enough to describe the panel hardware, so I think it should be dropped.

Thanks,
Neil

>>
>> Regards
>> Luca
>>
>>>
>>> Thanks,
>>> Neil
>>>
>>>>
>>>> Yours,
>>>> Linus Walleij
>