linux-kernel - Re: [PATCH 01/26] dt-bindings: display: display-timing: Add property to configure sync drive edge

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Date:   Mon, 12 Sep 2016 08:05:20 -0500
From:   Rob Herring <robh@...nel.org>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     thierry.reding@...il.com, airlied@...ux.ie, tomi.valkeinen@...com,
        daniel.vetter@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 01/26] dt-bindings: display: display-timing: Add property
 to configure sync drive edge

On Thu, Sep 01, 2016 at 02:22:55PM +0300, Peter Ujfalusi wrote:
> There are display panels which demands that the sync signal is driven on
> different edge than the pixel data.
> With the syncclk-active property we can specify the clk edge to be used to
> drive the sync signal. When the property is missing it indicates that the
> sync is driven on the same edge as the pixel data.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> CC: Rob Herring <robh+dt@...nel.org>
> CC: Mark Rutland <mark.rutland@....com>
> CC: devicetree@...r.kernel.org
> ---
>  Documentation/devicetree/bindings/display/panel/display-timing.txt | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/display-timing.txt b/Documentation/devicetree/bindings/display/panel/display-timing.txt
> index e1d4a0b59612..1436292e7a56 100644
> --- a/Documentation/devicetree/bindings/display/panel/display-timing.txt
> +++ b/Documentation/devicetree/bindings/display/panel/display-timing.txt
> @@ -32,6 +32,12 @@ optional properties:
>  			- active low  = drive pixel data on falling edge/
>  					sample data on rising edge
>  			- ignored     = ignored
> + - syncclk-active: with
> +			- active high = drive sync on rising edge/

rising edge of what? pixel clk?

> +					sample sync on falling edge
> +			- active low  = drive sync on falling edge/
> +					sample sync on rising edge
> +			- omitted     = same configuration as pixelclk-active
>   - interlaced (bool): boolean to enable interlaced mode
>   - doublescan (bool): boolean to enable doublescan mode
>   - doubleclk (bool): boolean to enable doubleclock mode
> -- 
> 2.9.3
>