linux-kernel - Re: [PATCH 1/3] dt-bindings: display: lt9611: Add dsi-port-b property

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Message-ID: <7d9041a3-9d2b-469a-9fa7-89d53bbd2a1f@linaro.org>
Date: Tue, 27 Jan 2026 08:54:29 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Hongyang Zhao <hongyang.zhao@...ndersoft.com>,
 Andrzej Hajda <andrzej.hajda@...el.com>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 Roger Shimizu <rosh@...ian.org>
Subject: Re: [PATCH 1/3] dt-bindings: display: lt9611: Add dsi-port-b property

On 1/27/26 07:58, Hongyang Zhao wrote:
> Document the lontium,dsi-port-b property for selecting DSI Port B as
> the input source instead of the default Port A.
> 
> Signed-off-by: Hongyang Zhao <hongyang.zhao@...ndersoft.com>
> Reviewed-by: Roger Shimizu <rosh@...ian.org>
> ---
>   .../devicetree/bindings/display/bridge/lontium,lt9611.yaml          | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt9611.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt9611.yaml
> index 655db8cfdc25..9b7dba4e114c 100644
> --- a/Documentation/devicetree/bindings/display/bridge/lontium,lt9611.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt9611.yaml
> @@ -37,6 +37,12 @@ properties:
>     vcc-supply:
>       description: Regulator for 3.3V IO power.
>   
> +  lontium,dsi-port-b:
> +    type: boolean
> +    description:
> +      Use DSI Port B as the input source instead of Port A or Port A + B.
> +      Required when the DSI is physically connected to Port B.

This is not how this should be solved, the ports links are here for this exact purpose.

port@0 represents port A, port@1 represent port B, so you need to describe the HW correctly
in the first place.

Populate only port1 and in the driver check which ports are population and change the
configuration.

Neil

> +
>     ports:
>       $ref: /schemas/graph.yaml#/properties/ports
>   
>