Re: [PATCH v4 1/5] dt-bindings: media: renesas,vin: Add Gen4 family fallback

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, Jun 24, 2024 at 04:41:04PM +0200, Niklas Söderlund wrote:
> The two Gen4 SoCs released (V4H and V4M) that have a video capture
> pipeline the VIN IP are very similar.
> 
> The datasheet for the two SoCs have small nuances around the Pre-Clip
> registers ELPrC and EPPrC in three use-cases, interlaced images,
> embedded data and RAW8 input. On V4H the values written to the registers
> are based on odd numbers while on V4M they are even numbers, values are
> based on the input image size. No board that uses these SoCs which also
> have the external peripherals to test these nuances exists. Most likely
> this is an issue in the datasheet.
> 
> Before adding bindings for V4M add a family compatible fallback for
> Gen4. That way the driver only needs to be updated once for Gen4, and we
> still have the option to fix any problems in the driver if any testable
> differences between the two SoCs is found.
> 
> There are already DTS files using the renesas,vin-r8a779g0 compatible
> which needs to be updated to not produce a warning for DTS checks. And
> the driver will need to kept compatible with renesas,vin-r8a779g0, but
> for new Gen4 SoCs such as V4M we can avoid this.
> 
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>

Same caveat here. Using the g model as a fallback is, as we already
discussed, an option too and would be less disruptive.
Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

> ---
> * Changes since v3
> - New in v4.
> ---
>  Documentation/devicetree/bindings/media/renesas,vin.yaml | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/renesas,vin.yaml b/Documentation/devicetree/bindings/media/renesas,vin.yaml
> index 5539d0f8e74d..c3ef4fde7baf 100644
> --- a/Documentation/devicetree/bindings/media/renesas,vin.yaml
> +++ b/Documentation/devicetree/bindings/media/renesas,vin.yaml
> @@ -53,7 +53,10 @@ properties:
>                - renesas,vin-r8a77990 # R-Car E3
>                - renesas,vin-r8a77995 # R-Car D3
>                - renesas,vin-r8a779a0 # R-Car V3U
> +      - items:
> +          - enum:
>                - renesas,vin-r8a779g0 # R-Car V4H
> +          - const: renesas,rcar-gen4-vin # Generic R-Car Gen4
>  
>    reg:
>      maxItems: 1
> -- 
> 2.45.2
> 

Attachment: signature.asc
Description: PGP signature


[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux