linux-kernel - Re: [PATCH 1/2] media: dt-bindings: allwinner: h6-vpu-g2: Add IOMMU reference property

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Date:   Tue, 15 Nov 2022 15:11:14 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Chen-Yu Tsai <wenst@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
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 1/2] media: dt-bindings: allwinner: h6-vpu-g2: Add IOMMU
 reference property

On 15/11/2022 10:06, Chen-Yu Tsai wrote:
> The Hantro G2 video decoder block sits behind an IOMMU. The device tree
> binding needs a property to reference it. Without a reference for the
> implementation to properly configure the IOMMU, it will fault and cause
> the video decoder to fail.
> 
> Add an "iommus" property for referring to the IOMMU port. The master ID
> in the example is taken from the IOMMU fault error message on Linux,
> and the number seems to match the order in the user manual's IOMMU
> diagram.
> 
> Fixes: fd6be12716c4 ("media: dt-bindings: allwinner: document H6 Hantro G2 binding")
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> ---


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof