Re: [PATCH 3/4] media: dt-bindings: media: Document pclk-max-frequency property

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Hi!

On Thu, Sep 27, 2018 at 04:46:06PM +0200, Hugues Fruchet wrote:
> This optional property aims to inform parallel video devices
> of the maximum pixel clock frequency admissible by host video
> interface. If bandwidth of data to be transferred requires a
> pixel clock which is higher than this value, parallel video
> device could then typically adapt framerate to reach
> this constraint.
> 
> Signed-off-by: Hugues Fruchet <hugues.fruchet@xxxxxx>
> ---
>  Documentation/devicetree/bindings/media/video-interfaces.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
> index baf9d97..fa4c112 100644
> --- a/Documentation/devicetree/bindings/media/video-interfaces.txt
> +++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
> @@ -147,6 +147,8 @@ Optional endpoint properties
>    as 0 (normal). This property is valid for serial busses only.
>  - strobe: Whether the clock signal is used as clock (0) or strobe (1). Used
>    with CCP2, for instance.
> +- pclk-max-frequency: maximum pixel clock frequency admissible by video
> +  host interface.

That seems to be a property of the capture device, not the camera
itself. Can't that be negotiated through the media API?

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com



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