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

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Date: Thu, 15 Feb 2024 11:41:32 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: neil.armstrong@...aro.org, 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>,
 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 10:50, neil.armstrong@...aro.org wrote:
> 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.

+1

Konrad