linux-kernel - RE: [Patch v6] dt-bindings: media: s5p-mfc: convert bindings to json-schema

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Message-ID: <000701d95257$e97ebd50$bc7c37f0$@samsung.com>
Date:   Thu, 9 Mar 2023 12:52:27 +0530
From:   "Aakarsh Jain" <aakarsh.jain@...sung.com>
To:     "'Krzysztof Kozlowski'" <krzysztof.kozlowski@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Cc:     <m.szyprowski@...sung.com>, <andrzej.hajda@...el.com>,
        <mchehab@...nel.org>, <hverkuil-cisco@...all.nl>,
        <ezequiel@...guardiasur.com.ar>, <jernej.skrabec@...il.com>,
        <benjamin.gaignard@...labora.com>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <stanimir.varbanov@...aro.org>, <dillon.minfei@...il.com>,
        <david.plowman@...pberrypi.com>, <mark.rutland@....com>,
        <robh+dt@...nel.org>, <krzk+dt@...nel.org>, <andi@...zian.org>,
        <alim.akhtar@...sung.com>, <aswani.reddy@...sung.com>,
        <pankaj.dubey@...sung.com>
Subject: RE: [Patch v6] dt-bindings: media: s5p-mfc: convert bindings to
 json-schema



> -----Original Message-----
> From: Krzysztof Kozlowski [mailto:krzysztof.kozlowski@...aro.org]
> Sent: 09 March 2023 12:15
> To: Aakarsh Jain <aakarsh.jain@...sung.com>; linux-arm-
> kernel@...ts.infradead.org; linux-media@...r.kernel.org; linux-
> kernel@...r.kernel.org; devicetree@...r.kernel.org
> Cc: m.szyprowski@...sung.com; andrzej.hajda@...el.com;
> mchehab@...nel.org; hverkuil-cisco@...all.nl;
> ezequiel@...guardiasur.com.ar; jernej.skrabec@...il.com;
> benjamin.gaignard@...labora.com; krzysztof.kozlowski+dt@...aro.org;
> stanimir.varbanov@...aro.org; dillon.minfei@...il.com;
> david.plowman@...pberrypi.com; mark.rutland@....com;
> robh+dt@...nel.org; krzk+dt@...nel.org; andi@...zian.org;
> alim.akhtar@...sung.com; aswani.reddy@...sung.com;
> pankaj.dubey@...sung.com
> Subject: Re: [Patch v6] dt-bindings: media: s5p-mfc: convert bindings to json-
> schema
> 
> On 02/03/2023 16:18, Aakarsh Jain wrote:
> >>
> >> iommus:
> >>   maxItems: 1
> >> iommu-names: false
> >>
> > I am getting compilation errors with above property set and its breaking the
> bindings.
> > If we see these two nodes in dtsi files.
> >                mfc: codec@...00000 {
> >                         compatible = "samsung,mfc-v5"; ..
> >                         iommus = <&sysmmu_mfc_l>, <&sysmmu_mfc_r>;
> >                         iommu-names = "left", "right"; } And
> >               mfc: codec@...00000 {
> >                         compatible = "samsung,exynos3250-mfc", "samsung,mfc-v7";
> >                         reg = <0x13400000 0x10000>; ...
> >                         iommus = <&sysmmu_mfc>;
> >                 };
> > There is no iommu-names property for compatible "samsung,exynos3250-
> mfc, samsung,mfc-v7", that’s why I kept
> >         iommus:
> >           minItems: 1
> >           maxItems: 2
> > I would even go with below if you agree?
> >         iommus:
> >           minItems: 1
> >           maxItems: 2
> >         iommus-names: false
> 
> No, I don't agree. Why do you need two IOMMUs for Exynos3250?
> >
Here IOMMUs minItems:1 is meant for Exynos3250 while IOMMUs maxItems:2 meant for samsung,mfc-v5(Exynos 4).
As you suggested 
iommus:
  maxItems: 1
iommu-names: false

won't fit here.
Since IOMMUs maxItems is 2 here for Exynos4. Giving maxItems:2 alone will also break the bindings. Thanks why suggested
         iommus:
           minItems: 1
           maxItems: 2
> 
> Best regards,
> Krzysztof