linux-kernel - Re: [PATCH v13 1/3] dt-bindings: i2c: Add CP2112 HID USB to SMBus Bridge

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Message-ID: <64ae7870-0ac2-49f2-bd0d-fbb25aec5828@kernel.org>
Date: Wed, 28 Jan 2026 16:52:51 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Conor Dooley <conor@...nel.org>
Cc: Danny Kaehn <danny.kaehn@...xus.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Benjamin Tissoires <bentiss@...nel.org>, Andi Shyti <andi.shyti@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Jiri Kosina <jikos@...nel.org>,
 devicetree@...r.kernel.org, linux-input@...r.kernel.org,
 Dmitry Torokhov <dmitry.torokhov@...il.com>,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
 Ethan Twardy <ethan.twardy@...xus.com>, linux-i2c@...r.kernel.org,
 linux-kernel@...r.kernel.org, Leo Huang <leohu@...dia.com>,
 Arun D Patil <arundp@...dia.com>, Willie Thai <wthai@...dia.com>,
 Ting-Kai Chen <tingkaic@...dia.com>
Subject: Re: [PATCH v13 1/3] dt-bindings: i2c: Add CP2112 HID USB to SMBus
 Bridge

On 28/01/2026 16:51, Andy Shevchenko wrote:
> On Wed, Jan 28, 2026 at 03:06:58PM +0000, Conor Dooley wrote:
>> On Wed, Jan 28, 2026 at 02:49:39PM +0200, Andy Shevchenko wrote:
>>> On Wed, Jan 28, 2026 at 11:35:25AM +0100, Krzysztof Kozlowski wrote:
>>>> On Tue, Jan 27, 2026 at 10:02:17AM -0600, Danny Kaehn wrote:
> 
> ...
> 
>>>> That's actually rule communicated many times, also documented in writing
>>>> bindings and in recent talks.
>>>
>>> Does DT represents HW in this case? Shouldn't I²C controller be the same node?
>>> Why not? This is inconsistent for the device that is multi-functional. And from
>>> my understanding the firmware description (DT, ACPI, you-name-it) must follow
>>> the HW. I don't see how it's done in this case.
>>
>> The i2c controller should probably be in the same node too, unless it
>> would cause conflicts between function (e.g. inability to figure out if
>> a child is a hog or a i2c device). I would like a rationale provided for
>> why the i2c controller is in a subnode.
> 
> I can expect a disaster with such a scheme, splitting multi-functional device

So for some years no disaster happened, at least nothing was reported to us.

Best regards,
Krzysztof