[PATCH v3 04/10] dt-bindings: display: renesas: lvds: Add renesas, companion property

[Sam Ravnborg]

Hi Laurent.

Reading through this nice series.

On Tue, May 28, 2019 at 05:12:28PM +0300, Laurent Pinchart wrote:
> Add a new optional renesas,companion property to point to the companion
> LVDS encoder. This is used to support dual-link operation where the main
> LVDS encoder splits even-numbered and odd-numbered pixels between the
> two LVDS encoders.
> 
> The new property doesn't control the mode of operation, it only
> describes the relationship between the master and companion LVDS
> encoders.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
> Reviewed-by: Jacopo Mondi <jacopo at jmondi.org>
> Tested-by: Jacopo Mondi <jacopo+renesas at jmondi.org>
> ---
> Changes since v2:
> 
> - Clarify when the companion property is required or not allowed
> 
> Changes since v1:
> 
> - Fixed typo
> ---
>  .../devicetree/bindings/display/bridge/renesas,lvds.txt    | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt b/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
> index 900a884ad9f5..2d24bd8cbec5 100644
> --- a/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
> +++ b/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
> @@ -45,6 +45,13 @@ OF graph bindings specified in Documentation/devicetree/bindings/graph.txt.
>  
>  Each port shall have a single endpoint.
>  
> +Optional properties:
> +
> +- renesas,companion : phandle to the companion LVDS encoder. This property is
> +  mandatory for the first LVDS encoder on D3 and E3 SoCs, and shall point to
> +  the second encoder to be used as a companion in dual-link mode. It shall not
> +  be set for any other LVDS encoder.

If the D3 and E3 socs do not mandate the use of dual-link, then what to
do in the DT? Because according to the above this property must be
specified for D3 and E3 SOC's.

> +
>  
>  Example:

Always good with examples, maybe it comes later.

	Sam