Hi Niklas,

On Fri, Nov 02, 2018 at 05:00:06PM +0100, Niklas Söderlund wrote:
> The CSI-2 transmitters can use a different number of lanes to transmit
> data. Make the data-lanes mandatory for the endpoints that describe the
> transmitters as no good default can be set to fallback on.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
>
> ---
> * Changes since v2
> - Update paragraph according to Laurents comments.
> ---
>  Documentation/devicetree/bindings/media/i2c/adv748x.txt | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/media/i2c/adv748x.txt b/Documentation/devicetree/bindings/media/i2c/adv748x.txt
> index 5dddc95f9cc46084..bffbabc879efd86c 100644
> --- a/Documentation/devicetree/bindings/media/i2c/adv748x.txt
> +++ b/Documentation/devicetree/bindings/media/i2c/adv748x.txt
> @@ -48,7 +48,9 @@ are numbered as follows.
>  	  TXA		source		10
>  	  TXB		source		11
>
> -The digital output port nodes must contain at least one endpoint.
> +The digital output port nodes, when present, shall contain at least one
> +endpoint. Each of those endpoints shall contain the data-lanes property as
> +described in video-interfaces.txt.
>
>  Ports are optional if they are not connected to anything at the hardware level.
>

Re-vamping my ignored comment on v2, I still think you should list here the
accepted values for each TX as they're actually a property of the hw
device itself.

 Required endpoint properties:
- data-lanes: See "video-interfaces.txt" for description. The property
  is mandatory for CSI-2 output endpoints and the accepted value
  depends on which endpoint the property is applied to:
  - TXA: accepted values are <1>, <2>, <4>
  - TXB: accepted value is <1>
> --
> 2.19.1
>