linux-kernel - Re: [PATCH 1/2] dt-bindings: google,cros-ec-keyb: Introduce switches only compatible

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Date:   Thu, 28 Apr 2022 08:12:47 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        "Joseph S. Barrera III" <joebar@...omium.org>
Subject: Re: [PATCH 1/2] dt-bindings: google,cros-ec-keyb: Introduce switches
 only compatible

On 27/04/2022 22:30, Stephen Boyd wrote:
> If the device is a detachable, this device won't have a matrix keyboard
> but it may have some button switches, e.g. volume buttons and power
> buttons. Let's add a more specific compatible for this type of device
> that indicates to the OS that there are only switches and no matrix
> keyboard present.
> 
> Cc: Krzysztof Kozlowski <krzk@...nel.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: <devicetree@...r.kernel.org>
> Cc: Benson Leung <bleung@...omium.org>
> Cc: Guenter Roeck <groeck@...omium.org>
> Cc: Douglas Anderson <dianders@...omium.org>
> Cc: Hsin-Yi Wang <hsinyi@...omium.org>
> Cc: "Joseph S. Barrera III" <joebar@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  .../bindings/input/google,cros-ec-keyb.yaml          | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
> index e8f137abb03c..edc1194d558d 100644
> --- a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
> +++ b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml
> @@ -15,14 +15,20 @@ description: |
>    Google's ChromeOS EC Keyboard is a simple matrix keyboard
>    implemented on a separate EC (Embedded Controller) device. It provides
>    a message for reading key scans from the EC. These are then converted
> -  into keycodes for processing by the kernel.
> +  into keycodes for processing by the kernel. This device also supports
> +  switches/buttons like power and volume buttons.
>  
>  allOf:
>    - $ref: "/schemas/input/matrix-keymap.yaml#"
>  
>  properties:
>    compatible:
> -    const: google,cros-ec-keyb
> +    oneOf:
> +      - items:
> +          - const: google,cros-ec-keyb-switches
> +          - const: google,cros-ec-keyb
> +      - items:
> +          - const: google,cros-ec-keyb
>  

In such case matrix-keymap properties are not valid, right? The
matrix-keymap should not be referenced, IOW, you need to move allOf
below "required" and add:
if:not:...then: $ref: "/schemas/input/matrix-keymap.yaml

Best regards,
Krzysztof