linux-kernel - Re: [PATCH 1/2] dt-bindings: input: document Novatek NVT touchscreen controller

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Thu, 23 May 2024 05:03:32 -0500
From: Joel Selvaraj <joelselvaraj.oss@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Hans de Goede
 <hdegoede@...hat.com>, Dmitry Torokhov <dmitry.torokhov@...il.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-input@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: input: document Novatek NVT touchscreen
 controller

Hi Krzysztof Kozlowski,

On 5/23/24 01:18, Krzysztof Kozlowski wrote:
>>>> +properties:
>>>> +  compatible:
>>>> +    enum:
>>>> +      - novatek,nvt-ts
>>>
>>> That's too generic. Looking at your driver change, it is not even needed.

As suggested by Hans de Goede, I will fix the too generic issue in v2.

>>>> +      - novatek,nt36672a-ts
>>>
>>> Eh, we have already panel. Why there is a need for touchscreen binding
>>> (binding, not driver)?
>>
>> I am not sure I understand this correctly. Help me a bit here. For
>> context, in mainline there is an existing driver for the novatek nvt
>> touchscreen controller. The driver did not have devicetree support. It
>> only had a i2c_device_id "NVT-ts". I don't know what is the variant of
> 
> I just got a bit confused that you add another binding for the same
> device, but now I see these are different interfaces - DSI and I2C.
> 
>> that Novatek touchscreen controller. To use the driver in Xiaomi Poco
>> F1, I introduced a devicetree compatible for it "novatek,nvt-ts". The
>> However, the Novatek touchscreen controller present in Xiaomi Poco F1 is
>> "NT36672A" which has a different chip id than the one in existing
>> driver. So I created a separate compatible for this touchscreen
>> controller variant "novatek,nt36672a-ts". I used compatible data to
>> differentiate the two variants. Since there are two variants, I am
>> mentioning both here.
> 
> Just to be clear, I don't care about driver here but hardware. You have
> two separate interfaces on this hardware - DSI virtual channel and I2C?

Yes, there are two different interface in the hardware. The display 
panel is connected via DSI and the touchscreen is connected via I2C 
interface separately.

> 
> Best regards,
> Krzysztof
> 

Regards,
Joel Selvaraj