linux-kernel - Re: [PATCH v2 1/2] media: dt-bindings: allwinner: video-engine: Fix number of IOMMU channels

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Date:   Thu, 17 Nov 2022 14:13:00 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jernej Skrabec <jernej.skrabec@...il.com>, mchehab@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        wens@...e.org, samuel@...lland.org
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] media: dt-bindings: allwinner: video-engine: Fix
 number of IOMMU channels

On 17/11/2022 07:07, Jernej Skrabec wrote:
> Cedrus (video engine) on Allwinner H6 actually uses two IOMMU channel,
> not just one. However, Cedrus on SoCs like D1 only uses one channel.
> 
> Allow up to 2 IOMMU channels.
> 
> Fixes: 62a8ccf3a248 ("arm64: dts: allwinner: h6: Fix Cedrus IOMMU usage")
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
> ---
>  .../bindings/media/allwinner,sun4i-a10-video-engine.yaml       | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engine.yaml b/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engine.yaml
> index 541325f900a1..6446004d59d9 100644
> --- a/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engine.yaml
> +++ b/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engine.yaml
> @@ -55,7 +55,8 @@ properties:
>      description: Phandle to the device SRAM
>  
>    iommus:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2

You have several compatibles in the file, so usually this is further
constrained per each variant in allOf:if:then:.

Best regards,
Krzysztof