linux-kernel - Re: [PATCH v3 01/24] dt-bindings: iommu: mediatek: Convert IOMMU to DT schema

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Date:   Mon, 12 Oct 2020 19:08:09 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, youlin.pei@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>, anan.sun@...iatek.com,
        chao.hao@...iatek.com, ming-fan.chen@...iatek.com,
        Greg Kroah-Hartman <gregkh@...gle.com>, kernel-team@...roid.com
Subject: Re: [PATCH v3 01/24] dt-bindings: iommu: mediatek: Convert IOMMU to
 DT schema

On Tue, 6 Oct 2020 at 06:27, Yong Wu <yong.wu@...iatek.com> wrote:
>
> On Fri, 2020-10-02 at 13:07 +0200, Krzysztof Kozlowski wrote:
> > On Wed, Sep 30, 2020 at 03:06:24PM +0800, Yong Wu wrote:
> > > Convert MediaTek IOMMU to DT schema.
> > >
> > > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > > ---
> > >  .../bindings/iommu/mediatek,iommu.txt         | 103 ------------
> > >  .../bindings/iommu/mediatek,iommu.yaml        | 154 ++++++++++++++++++
> > >  2 files changed, 154 insertions(+), 103 deletions(-)
> > >  delete mode 100644 Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
> > >  create mode 100644 Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
> > >
>
> [...]
>
> > > +properties:
> > > +  compatible:
> > > +    oneOf:
> > > +      - enum:
> > > +          - mediatek,mt2701-m4u # mt2701 generation one HW
> > > +          - mediatek,mt2712-m4u # mt2712 generation two HW
> > > +          - mediatek,mt6779-m4u # mt6779 generation two HW
> > > +          - mediatek,mt8173-m4u # mt8173 generation two HW
> > > +          - mediatek,mt8183-m4u # mt8183 generation two HW
> > > +
> > > +      - description: mt7623 generation one HW
> > > +        items:
> > > +          - const: mediatek,mt7623-m4u
> > > +          - const: mediatek,mt2701-m4u
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> > > +
> > > +  clocks:
> > > +    description: |
> > > +      bclk is optional. here is the list which require this bclk:
> > > +      mt2701, mt2712, mt7623 and mt8173.
> >
> > Similarly to my comment in other patch, this should be part of schema
> > within 'if-then'.
>
> Thanks for the review.
>
> I will change like this:
>
> =============
>   clocks:
>     items:
>       - description: bclk is the block clock.
>
>   clock-names:
>     items:
>       - const: bclk
>
> required:
>   - compatible
>   - reg
>   - interrupts
>   - mediatek,larbs
>   - '#iommu-cells'
> if:
>   properties:
>     compatible:
>       contains:
>         enum:
>           - mediatek,mt2701-m4u
>           - mediatek,mt2712-m4u
>           - mediatek,mt8173-m4u
>
> then:
>  required:
>    - clocks
> ==============
>
> If this is not right, please tell me.
> (dt_binding_check is ok.)

Looks fine, except "if" should be part of some "allOf" block.

Best regards,
Krzysztof