linux-kernel - Re: [PATCH 2/2] dt-bindings: display: bridge: lt8912b: document 'lontium, pn-swap' property

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Date: Sun, 7 Apr 2024 23:31:54 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Alexandru Ardelean <alex@...uggie.ro>
Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	devicetree@...r.kernel.org, adrien.grassein@...il.com, andrzej.hajda@...el.com, 
	neil.armstrong@...aro.org, rfoss@...nel.org, Laurent.pinchart@...asonboard.com, 
	jonas@...boo.se, jernej.skrabec@...il.com, airlied@...il.com, daniel@...ll.ch, 
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de, robh@...nel.org, 
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, stefan.eichenberger@...adex.com, 
	francesco.dolcini@...adex.com, marius.muresan@....ro, irina.muresan@....ro
Subject: Re: [PATCH 2/2] dt-bindings: display: bridge: lt8912b: document
 'lontium, pn-swap' property

On Tue, Apr 02, 2024 at 01:59:25PM +0300, Alexandru Ardelean wrote:
> On some HW designs, it's easier for the layout if the P/N pins are swapped.
> The driver currently has a DT property to do that.
> 
> This change documents the 'lontium,pn-swap' property.
> 
> Signed-off-by: Alexandru Ardelean <alex@...uggie.ro>
> ---
>  .../devicetree/bindings/display/bridge/lontium,lt8912b.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml
> index 2cef252157985..3a804926b288a 100644
> --- a/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml
> @@ -24,6 +24,12 @@ properties:
>      maxItems: 1
>      description: GPIO connected to active high RESET pin.
>  
> +  lontium,pn-swap:
> +    description: Swap the polarities of the P/N pins in software.
> +      On some HW designs, the layout is simplified if the P/N pins
> +      are inverted.
> +    type: boolean
> +

I'd like to point out the standard `lane-polarities` property defined at
Documentation/devicetree/bindings/media/video-interfaces.yaml. You can
define and use it for the corresponding endpoint in the lt8912b schema.

>    ports:
>      $ref: /schemas/graph.yaml#/properties/ports
>  
> -- 
> 2.44.0
> 

-- 
With best wishes
Dmitry