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

[Aakarsh Jain]

> -----Original Message-----
> From: Krzysztof Kozlowski [mailto:krzysztof.kozlowski at linaro.org]
> Sent: 09 March 2023 12:15
> To: Aakarsh Jain <aakarsh.jain at samsung.com>; linux-arm-
> kernel at lists.infradead.org; linux-media at vger.kernel.org; linux-
> kernel at vger.kernel.org; devicetree at vger.kernel.org
> Cc: m.szyprowski at samsung.com; andrzej.hajda at intel.com;
> mchehab at kernel.org; hverkuil-cisco at xs4all.nl;
> ezequiel at vanguardiasur.com.ar; jernej.skrabec at gmail.com;
> benjamin.gaignard at collabora.com; krzysztof.kozlowski+dt at linaro.org;
> stanimir.varbanov at linaro.org; dillon.minfei at gmail.com;
> david.plowman at raspberrypi.com; mark.rutland at arm.com;
> robh+dt at kernel.org; krzk+dt at kernel.org; andi at etezian.org;
> alim.akhtar at samsung.com; aswani.reddy at samsung.com;
> pankaj.dubey at samsung.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 at 13400000 {
> >                         compatible = "samsung,mfc-v5"; ..
> >                         iommus = <&sysmmu_mfc_l>, <&sysmmu_mfc_r>;
> >                         iommu-names = "left", "right"; } And
> >               mfc: codec at 13400000 {
> >                         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