linux-kernel - Re: [PATCH 1/9] dt-bindings: HID: i2c-hid: Add "panel" property to i2c-hid backed panels

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Date:   Tue, 30 May 2023 17:34:47 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     dri-devel@...ts.freedesktop.org, linux-input@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>, hsinyi@...gle.com,
        devicetree@...r.kernel.org,
        yangcong5@...qin.corp-partner.google.com,
        linux-kernel@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        linux-arm-msm@...r.kernel.org, cros-qcom-dts-watchers@...omium.org
Subject: Re: [PATCH 1/9] dt-bindings: HID: i2c-hid: Add "panel" property to
 i2c-hid backed panels

On 23/05/2023 21:27, Douglas Anderson wrote:
> As talked about in the patch ("drm/panel: Add a way for other devices
> to follow panel state"), touchscreens that are connected to panels are
> generally expected to be power sequenced together with the panel
> they're attached to. Today, nothing provides information allowing you
> to find out that a touchscreen is connected to a panel. Let's add a
> phandle for this.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
>  Documentation/devicetree/bindings/input/elan,ekth6915.yaml  | 6 ++++++
>  Documentation/devicetree/bindings/input/goodix,gt7375p.yaml | 6 ++++++
>  Documentation/devicetree/bindings/input/hid-over-i2c.yaml   | 6 ++++++
>  3 files changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
> index 05e6f2df604c..d55b03bd3ec4 100644
> --- a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
> +++ b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
> @@ -24,6 +24,12 @@ properties:
>    interrupts:
>      maxItems: 1
>  
> +  panel:
> +    description: If this is a touchscreen, the panel it's connected to. This

Hm, can there be different setup? Touchscreen without panel? What would
it be then?

Why only these touchscreens? This looks generic, so maybe in
touchscreen.yaml?

Best regards,
Krzysztof