linux-kernel - Re: [PATCH v2 2/5] dt-bindings: mmc: sdhci-msm: constrain reg-names perp variants

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Message-ID: <CAD=FV=X2ZfwwDO_hSSN35ObfvBbBbPjMoSB4GvS7m0yJieNg3Q@mail.gmail.com>
Date:   Mon, 11 Jul 2022 08:11:29 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] dt-bindings: mmc: sdhci-msm: constrain reg-names
 perp variants

Hi,

On Mon, Jul 11, 2022 at 7:53 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 11/07/2022 16:52, Doug Anderson wrote:
> > Hi
> >
> > On Mon, Jul 11, 2022 at 1:29 AM Krzysztof Kozlowski
> > <krzysztof.kozlowski@...aro.org> wrote:
> >>
> >> The entries in arrays must have fixed order, so the bindings and Linux
> >> driver expecting various combinations of 'reg' addresses was never
> >> actually conforming to guidelines.
> >>
> >> The 'core' reg entry is valid only for SDCC v4 and lower, so disallow it
> >> in SDCC v5.  SDCC v4 supports CQE and ICE, so allow them, even though
> >> the qcom,sdhci-msm-v4 compatible is used also for earlier SoCs with SDCC
> >> v2 or v3, so it is not entirely accurate.
> >>
> >> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> >>
> >> ---
> >>
> >> Changes since v1:
> >> 1. Rework the patch based on Doug's feedback.
> >> ---
> >>  .../devicetree/bindings/mmc/sdhci-msm.yaml    | 61 ++++++++++++-------
> >>  1 file changed, 38 insertions(+), 23 deletions(-)
> >
> > In the ${SUBJECT} I'm not sure what a "perp variant" is. Is that a
> > typo or just a phrase I'm not aware of?
>
> Should be:
> "per variants"
>
> >
> >
> >> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> >> index fc6e5221985a..2f0fdd65e908 100644
> >> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> >> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> >> @@ -49,33 +49,11 @@ properties:
> >>
> >>    reg:
> >>      minItems: 1
> >> -    items:
> >> -      - description: Host controller register map
> >> -      - description: SD Core register map
> >> -      - description: CQE register map
> >> -      - description: Inline Crypto Engine register map
> >> +    maxItems: 4
> >>
> >>    reg-names:
> >>      minItems: 1
> >>      maxItems: 4
> >> -    oneOf:
> >> -      - items:
> >> -          - const: hc
> >> -      - items:
> >> -          - const: hc
> >> -          - const: core
> >> -      - items:
> >> -          - const: hc
> >> -          - const: cqhci
> >> -      - items:
> >> -          - const: hc
> >> -          - const: cqhci
> >> -          - const: ice
> >> -      - items:
> >> -          - const: hc
> >> -          - const: core
> >> -          - const: cqhci
> >> -          - const: ice
> >>
> >>    clocks:
> >>      minItems: 3
> >> @@ -177,6 +155,43 @@ required:
> >>  allOf:
> >>    - $ref: mmc-controller.yaml#
> >>
> >> +  - if:
> >> +      properties:
> >> +        compatible:
> >> +          contains:
> >> +            enum:
> >> +              - qcom,sdhci-msm-v4
> >> +    then:
> >> +      properties:
> >> +        reg:
> >> +          minItems: 2
> >> +          items:
> >> +            - description: Host controller register map
> >> +            - description: SD Core register map
> >> +            - description: CQE register map
> >> +            - description: Inline Crypto Engine register map
> >> +        reg-names:
> >> +          minItems: 2
> >> +          items:
> >> +            - const: hc
> >> +            - const: core
> >> +            - const: cqhci
> >> +            - const: ice
> >> +    else:
> >> +      properties:
> >> +        reg:
> >> +          minItems: 1
> >> +          items:
> >> +            - description: Host controller register map
> >> +            - description: CQE register map
> >> +            - description: Inline Crypto Engine register map
> >> +        reg-names:
> >> +          minItems: 1
> >> +          items:
> >> +            - const: hc
> >> +            - const: cqhci
> >> +            - const: ice
> >
> > Do you need to set "maxItems" here? If you don't then will it inherit
> > the maxItems of 4 from above?
>
> No, items determine the size instead.

Can you just remove the "maxItems" from above then? Does it buy us anything?

In any case, with the ${SUBJECT} fixed:

Reviewed-by: Douglas Anderson <dianders@...omium.org>