linux-kernel - Re: [PATCH 2/4] media: dt-binding: media: Document rk3588’s vepu121

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Date: Wed, 20 Mar 2024 21:16:56 +0100
From: Sebastian Reichel <sebastian.reichel@...labora.com>
To: Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
Cc: linux-kernel@...r.kernel.org, 
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Heiko Stuebner <heiko@...ech.de>, Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, 
	Robin Murphy <robin.murphy@....com>, Cristian Ciocaltea <cristian.ciocaltea@...labora.com>, 
	Dragan Simic <dsimic@...jaro.org>, Shreeya Patel <shreeya.patel@...labora.com>, 
	Chris Morgan <macromorgan@...mail.com>, Andy Yan <andy.yan@...k-chips.com>, 
	Nicolas Frattaroli <frattaroli.nicolas@...il.com>, linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev
Subject: Re: [PATCH 2/4] media: dt-binding: media: Document rk3588’s vepu121

Hi,

On Wed, Mar 20, 2024 at 06:37:31PM +0100, Emmanuel Gil Peyrot wrote:
> This encoder-only device is present four times on this SoC, and should
> support everything the rk3568 vepu supports (so JPEG, H.264 and VP8
> encoding).
> 
> Signed-off-by: Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
> ---
>  .../devicetree/bindings/media/rockchip,rk3568-vepu.yaml          | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/rockchip,rk3568-vepu.yaml b/Documentation/devicetree/bindings/media/rockchip,rk3568-vepu.yaml
> index 9d90d8d0565a..947ad699cc5e 100644
> --- a/Documentation/devicetree/bindings/media/rockchip,rk3568-vepu.yaml
> +++ b/Documentation/devicetree/bindings/media/rockchip,rk3568-vepu.yaml
> @@ -17,6 +17,7 @@ properties:
>    compatible:
>      enum:
>        - rockchip,rk3568-vepu
> +      - rockchip,rk3588-vepu121

Looks like they are fully compatible. In that case it's better to
use a fallback compatible (i.e. like the iommu binding), which does
not need any drivers changes. So binding should be like this:

compatible:
  oneOf:
    - const: rockchip,rk3568-vepu
    - items:
      - enum:
          - rockchip,rk3588-vepu121
      - const: rockchip,rk3568-vepu

Then in DT (i.e. the following patch) you use

compatible = "rockchip,rk3588-vepu121", "rockchip,rk3568-vepu";

And patch 4/4 can be dropped.

Greetings,

-- Sebastian

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