linux-kernel - Re: [PATCH v3 02/24] dt-bindings: memory: mediatek: Convert SMI to DT schema

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Message-ID: <20201012071843.GA1889@pi3>
Date:   Mon, 12 Oct 2020 09:18:43 +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 02/24] dt-bindings: memory: mediatek: Convert SMI to
 DT schema

On Sat, Oct 10, 2020 at 02:18:11PM +0800, Yong Wu wrote:
> On Tue, 2020-10-06 at 09:15 +0200, Krzysztof Kozlowski wrote:
> > On Tue, 6 Oct 2020 at 06:27, Yong Wu <yong.wu@...iatek.com> wrote:
> > >
> > > On Fri, 2020-10-02 at 13:08 +0200, Krzysztof Kozlowski wrote:
> > > > On Wed, Sep 30, 2020 at 03:06:25PM +0800, Yong Wu wrote:
> > > > > Convert MediaTek SMI to DT schema.
> > > > >
> > > > > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > > > > ---
> > > > >  .../mediatek,smi-common.txt                   |  49 ---------
> > > > >  .../mediatek,smi-common.yaml                  | 100 ++++++++++++++++++
> > > > >  .../memory-controllers/mediatek,smi-larb.txt  |  49 ---------
> > > > >  .../memory-controllers/mediatek,smi-larb.yaml |  91 ++++++++++++++++
> > > > >  4 files changed, 191 insertions(+), 98 deletions(-)
> > > > >  delete mode 100644 Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.txt
> > > > >  create mode 100644 Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml
> > > > >  delete mode 100644 Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.txt
> > > > >  create mode 100644 Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.yaml
> > > ...
> > > > > +properties:
> > > > > +  compatible:
> > > > > +    oneOf:
> > > > > +      - enum:
> > > > > +          - mediatek,mt2701-smi-common
> > > > > +          - mediatek,mt2712-smi-common
> > > > > +          - mediatek,mt6779-smi-common
> > > > > +          - mediatek,mt8173-smi-common
> > > > > +          - mediatek,mt8183-smi-common
> > > > > +
> > > > > +      - description: for mt7623
> > > > > +        items:
> > > > > +          - const: mediatek,mt7623-smi-common
> > > > > +          - const: mediatek,mt2701-smi-common
> > > > > +
> > > > > +  reg:
> > > > > +    maxItems: 1
> > > > > +
> > > > > +  clocks:
> > > > > +    description: |
> > > > > +      apb and smi are mandatory. the async is only for generation 1 smi HW.
> > > > > +      gals(global async local sync) also is optional, here is the list which
> > > > > +      require gals: mt6779 and mt8183.
> > > > > +    minItems: 2
> > > > > +    maxItems: 4
> > > > > +    items:
> > > > > +      - description: apb is Advanced Peripheral Bus clock, It's the clock for
> > > > > +          setting the register.
> > > > > +      - description: smi is the clock for transfer data and command.
> > > > > +      - description: async is asynchronous clock, it help transform the smi clock
> > > > > +          into the emi clock domain.
> > > > > +      - description: gals0 is the path0 clock of gals.
> > > > > +      - description: gals1 is the path1 clock of gals.
> > > > > +
> > > > > +  clock-names:
> > > > > +    oneOf:
> > > > > +      - items:
> > > > > +          - const: apb
> > > > > +          - const: smi
> > > > > +      - items:
> > > > > +          - const: apb
> > > > > +          - const: smi
> > > > > +          - const: async
> > > > > +      - items:
> > > > > +          - const: apb
> > > > > +          - const: smi
> > > > > +          - const: gals0
> > > > > +          - const: gals1
> > > >
> > > > Similarly to my comment to other properties, this requirement per
> > > > compatible should be part of the schema within 'if-then'.
> > >
> > > I'm not so familiar with this format. Do this has "if-then-'else
> > > if'-then-else"?
> > 
> > These are mutually exclusive conditions, so you can skip else:
> >  - if-then
> >  - if-then
> >  - if-then
> > It will be more readable then stacking 'if' under 'else'
> 
> Thanks. I will use something like this:
> 
>  anyOf:

Then it should be oneOf as only one condition can be valid.

Best regards,
Krzysztof

>    - if: #gen1 hw
>      then:
>        use apb/smi/async clocks
> 
>    - if: #gen2 hw that has gals.
>      then:
>        use apb/smi/gals0/gals1 clocks
>      else: # gen2 hw that doesn't have gals.
>        use apb/smi clocks.