[PATCH 1/2] dt-bindings: drm: bridge: adi,adv7533: Document adi,disable-lanes-override property

[Laurent Pinchart]

Hi Biju,

Thank you for the patch.

On Wed, Mar 09, 2022 at 03:11:08PM +0000, Biju Das wrote:
> On Renesas RZ/{G2L,V2L} platforms changing the lanes from 4 to 3 at
> lower frequencies causes display instability. On such platforms, it
> is better to avoid switching lanes from 4 to 3 as it needs different
> set of PLL parameter constraints to make the display stable with 3
> lanes.

Is this because the PLL calculation code doesn't work properly, or
because the hardware can't support this ?

> This patch introduces 'adi,disable-lanes-override' property to disable
> lane switching at lower frequencies.
> 
> Signed-off-by: Biju Das <biju.das.jz at bp.renesas.com>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj at bp.renesas.com>
> ---
>  .../devicetree/bindings/display/bridge/adi,adv7533.yaml      | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/adi,adv7533.yaml b/Documentation/devicetree/bindings/display/bridge/adi,adv7533.yaml
> index f36209137c8a..2dc378039d21 100644
> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7533.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7533.yaml
> @@ -84,6 +84,11 @@ properties:
>        timings for HDMI output.
>      type: boolean
>  
> +  adi,disable-lanes-override:
> +    description:
> +      Disables the overriding lanes at lower frequencies.
> +    type: boolean
> +
>    adi,dsi-lanes:
>      description: Number of DSI data lanes connected to the DSI host.
>      $ref: /schemas/types.yaml#/definitions/uint32

-- 
Regards,

Laurent Pinchart