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

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Message-ID: <3385828.QJadu78ljV@jernej-laptop>
Date:   Thu, 17 Nov 2022 21:31:30 +0100
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     mchehab@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, wens@...e.org,
        samuel@...lland.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.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

Dne četrtek, 17. november 2022 ob 14:13:00 CET je Krzysztof Kozlowski 
napisal(a):
> 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-engin
> > e.yaml
> > b/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engin
> > e.yaml index 541325f900a1..6446004d59d9 100644
> > ---
> > a/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engin
> > e.yaml +++
> > b/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engin
> > e.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:.

Usually, yes. But this whole binding would need update. It has a few optional 
properties and none of them is tied to any compatible. Additionally, if I do 
it as you suggest, then Robs automatic test will report the issue, because 
existing H6 based boards won't match this binding anymore. I would much rather 
send follow up patch which clears up all optional properties.

Best regards,
Jernej