Re: [PATCH] dt-bindings: soc: qcom: qcom,spm: support regulator SAW2 devics

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On Sun, 2 Oct 2022 at 11:49, Krzysztof Kozlowski
<krzysztof.kozlowski@xxxxxxxxxx> wrote:
>
> On 01/10/2022 01:14, Dmitry Baryshkov wrote:
> > Merge qcom,saw2.txt bindings to existing qcom,spm.yaml. This fixes
> > compatibility of qcom,spm schema with regulator SAW2 devices.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> > ---
> >  .../devicetree/bindings/arm/msm/qcom,saw2.txt | 58 -------------------
> >  .../bindings/soc/qcom/qcom,spm.yaml           | 44 +++++++++-----
>
> You need to update reference in
> Documentation/devicetree/bindings/arm/cpus.yaml

ack

>
> >  2 files changed, 30 insertions(+), 72 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt
> >
> > diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt b/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt
> > deleted file mode 100644
> > index c0e3c3a42bea..000000000000
> > --- a/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt

[skipped]

> > diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,spm.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,spm.yaml
> > index f433e6e0a19f..8fe35fde70b8 100644
> > --- a/Documentation/devicetree/bindings/soc/qcom/qcom,spm.yaml
> > +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,spm.yaml
> > @@ -16,23 +16,33 @@ description: |
> >
> >  properties:
> >    compatible:
> > -    items:
> > -      - enum:
> > -          - qcom,sdm660-gold-saw2-v4.1-l2
> > -          - qcom,sdm660-silver-saw2-v4.1-l2
> > -          - qcom,msm8998-gold-saw2-v4.1-l2
> > -          - qcom,msm8998-silver-saw2-v4.1-l2
> > -          - qcom,msm8909-saw2-v3.0-cpu
> > -          - qcom,msm8916-saw2-v3.0-cpu
> > -          - qcom,msm8226-saw2-v2.1-cpu
> > -          - qcom,msm8974-saw2-v2.1-cpu
> > -          - qcom,apq8084-saw2-v2.1-cpu
> > -          - qcom,apq8064-saw2-v1.1-cpu
> > +    oneOf:
> >        - const: qcom,saw2
>
> I understand old bindings had it, but I don't think we really want to
> support the generic compatible on its own. Even old bindings indicated
> that there are several differences between SAWs.
>
> Especially confusing is that once qcom,saw2 can be alone and in other
> cases must be preceded by specific compatible. IOW, you allow for
> apq8064 two cases:
>
> 1. qcom,apq8064-saw2-v1.1-cpu, qcom,saw2
> 2. qcom,saw2
>
> I think we should instead add everywhere specific compatibles.

I see your point. Yes, it's probably worth doing that.

Robert, Christian, can you possibly check the version of the SAW2 used
on ipq4019 and ipq8064? It can be read from the SPM block at the
register offset 0xfd0.

> > +      - items:
> > +          - enum:
> > +              - qcom,sdm660-gold-saw2-v4.1-l2
> > +              - qcom,sdm660-silver-saw2-v4.1-l2
> > +              - qcom,msm8998-gold-saw2-v4.1-l2
> > +              - qcom,msm8998-silver-saw2-v4.1-l2
> > +              - qcom,msm8909-saw2-v3.0-cpu
> > +              - qcom,msm8916-saw2-v3.0-cpu
> > +              - qcom,msm8226-saw2-v2.1-cpu
> > +              - qcom,msm8974-saw2-v2.1-cpu
> > +              - qcom,apq8084-saw2-v2.1-cpu
> > +              - qcom,apq8064-saw2-v1.1-cpu
> > +          - const: qcom,saw2
> >
> >    reg:
> > -    description: Base address and size of the SPM register region
> > -    maxItems: 1
> > +    description: Base address and size of the SPM register region. An optional
> > +      second element specifies the base address and size of the alias register
> > +      region.
> > +    minItems: 1
> > +    maxItems: 2
>
> And it seems second region is not present on some variants?

The second region is a bit of a puzzle for me as it doesn't seem to be
used at all.

-- 
With best wishes
Dmitry



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