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 >
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