linux-kernel - Re: [PATCH v3 13/14] dt-bindings: iommu: rockchip: Add Rockchip RK3588

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Message-ID: <18610737.hlxOUv9cDv@diego>
Date:   Thu, 30 Nov 2023 23:46:25 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Andy Yan <andyshrk@....com>
Cc:     hjc@...k-chips.com, dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, sebastian.reichel@...labora.com,
        kever.yang@...k-chips.com, chris.obbard@...labora.com,
        Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH v3 13/14] dt-bindings: iommu: rockchip: Add Rockchip RK3588

Hi Andy,

Am Donnerstag, 30. November 2023, 13:25:00 CET schrieb Andy Yan:
> From: Andy Yan <andy.yan@...k-chips.com>
> 
> Add a Rockchip RK3588 compatible
> 
> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
> ---
> 
> (no changes since v1)
> 
>  Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml b/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
> index ba9124f721f1..3febf0c3c404 100644
> --- a/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
> +++ b/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
> @@ -22,6 +22,7 @@ properties:
>      enum:
>        - rockchip,iommu
>        - rockchip,rk3568-iommu
> +      - rockchip,rk3588-iommu

This enum only allows that the compatible has one element, namely one of
those listed here. In the dts though you declare
	compatible = "rockchip,rk3588-iommu", "rockchip,rk3568-iommu";
meaning that the rk3588-iommu is compatible to the rk3568-iommu

I think you'll need a construct like:

properties:
  compatible:
    oneOf:
      - enum:
          - rockchip,iommu
          - rockchip,rk3568-iommu
      - items:
          - enum:
              - rockchip,rk3588-iommu
          - const: rockchip,rk3568-iommu

to describe both the single-compatibles and the 2-item compatible for the
rk3588. For example pci/rockchip-dw-pcie.yaml does a similar thing already.

Heiko