linux-kernel - Re: [PATCH v2 2/2] dt-bindings: google,cros-ec-keyb: add use-fn-overlay prop

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Message-ID: <c539aa2a-e9be-40e7-9b75-1723bdaf0a39@kernel.org>
Date: Mon, 29 Dec 2025 15:59:44 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Fabio Baltieri <fabiobaltieri@...omium.org>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Benson Leung <bleung@...omium.org>,
 Guenter Roeck <groeck@...omium.org>, Tzung-Bi Shih <tzungbi@...nel.org>,
 Simon Glass <sjg@...omium.org>, linux-input@...r.kernel.org,
 devicetree@...r.kernel.org, chrome-platform@...ts.linux.dev,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt-bindings: google,cros-ec-keyb: add
 use-fn-overlay prop

On 29/12/2025 14:33, Fabio Baltieri wrote:
> On Mon, Dec 29, 2025 at 01:49:05PM +0100, Krzysztof Kozlowski wrote:
>> On 27/12/2025 16:48, Fabio Baltieri wrote:
>>> On Sat, Dec 27, 2025 at 01:44:26PM +0100, Krzysztof Kozlowski wrote:
>>>>> diff --git a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
>>>>> index fefaaf46a240..437575cdf352 100644
>>>>> --- a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
>>>>> +++ b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
>>>>> @@ -44,6 +44,14 @@ properties:
>>>>>        where the lower 16 bits are reserved. This property is specified only
>>>>>        when the keyboard has a custom design for the top row keys.
>>>>>  
>>>>> +  google,use-fn-overlay:
>>>>> +    description: |
>>>>> +      Use a function key overlay. This allows defining an extra set of codes
>>>>
>>>> What is a function key overlay? Overlays are DT term and therefore are
>>>> not suitable for bindings.
>>>
>>> Ok, guess I can rename it to `use-fn-key` or `use-fn-layer`, open to
>>> suggestions really.
>>
>> Use as Linux should use? Then it's software, so not suitable for DT.
> 
> Sorry I'm not sure how I understand the comment, this describes how the
> driver handles a keyboard with Fn keys, the codes are defined in the DT

Exactly. The purpose of DT is not to describe how driver should handle
anything.

See also DTS101 from this year's ELCE.

Best regards,
Krzysztof