[PATCH] arm64: dts: allwinner: h6: Fix Cedrus IOMMU usage

[Rob Herring]

On Sun, Jun 28, 2020 at 12:10 PM Maxime Ripard <maxime at cerno.tech> wrote:
>
> Now that the IOMMU driver has been introduced, it prevents any access from
> a DMA master going through it that hasn't properly mapped the pages, and
> that link is set up through the iommus property.
>
> Unfortunately we forgot to add that property to the video engine node when
> adding the IOMMU node, so now any DMA access is broken.
>
> Fixes: b3a0a2f910c7 ("arm64: dts: allwinner: h6: Add IOMMU")
> Signed-off-by: Maxime Ripard <maxime at cerno.tech>
> ---
>  .../bindings/display/allwinner,sun8i-a83t-de2-mixer.yaml       | 3 +++
>  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi                   | 1 +
>  2 files changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/display/allwinner,sun8i-a83t-de2-mixer.yaml b/Documentation/devicetree/bindings/display/allwinner,sun8i-a83t-de2-mixer.yaml
> index 1dee641e3ea1..ef624327e33e 100644
> --- a/Documentation/devicetree/bindings/display/allwinner,sun8i-a83t-de2-mixer.yaml
> +++ b/Documentation/devicetree/bindings/display/allwinner,sun8i-a83t-de2-mixer.yaml
> @@ -39,6 +39,9 @@ properties:
>    resets:
>      maxItems: 1
>
> +  iommus:
> +    maxItems: 1
> +

This is breaking linux-next because there is already an 'iommus' property.

Rob