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

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Message-ID: <20240402-sheet-retread-025759b22faf@spud>
Date: Tue, 2 Apr 2024 19:06:46 +0100
From: Conor Dooley <conor@...nel.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.

"currently", because 1/2 adds it. bindings patches should precede the
driver patches in the series, so please swap the patches and remove this
portion of the description.

> 
> 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.

Please explain what configuration of a board would cause these to be
swapped, rather than why someone might want to configure the board this
way. I've got no idea what this hardware is actually doing, so this is
being pulled out of a hat, but I'd expect something like "Some boards
swap the polarity of the P/N pins, use this property to indicate this to
software". 

> +    type: boolean

The type here should be flag.

Cheers,
Conor.

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

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