Re: [PATCH 1/6] dt-bindings: clock: qcom,dispcc-sm8x50: add mmcx power domain

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

On Thu, 1 Jul 2021 at 19:17, Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> On Wed, 30 Jun 2021 at 15:31, Dmitry Baryshkov
> <dmitry.baryshkov@linaro.org> wrote:
> >
> > On sm8250 dispcc requires MMCX power domain to be powered up before
> > clock controller's registers become available. For now sm8250 was using
> > external regulator driven by the power domain to describe this
> > relationship. Switch into specifying power-domain and required opp-state
> > directly.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> > ---
> >  .../bindings/clock/qcom,dispcc-sm8x50.yaml    | 19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/clock/qcom,dispcc-sm8x50.yaml b/Documentation/devicetree/bindings/clock/qcom,dispcc-sm8x50.yaml
> > index 0cdf53f41f84..48d86fb34fa7 100644
> > --- a/Documentation/devicetree/bindings/clock/qcom,dispcc-sm8x50.yaml
> > +++ b/Documentation/devicetree/bindings/clock/qcom,dispcc-sm8x50.yaml
> > @@ -55,6 +55,16 @@ properties:
> >    reg:
> >      maxItems: 1
> >
> > +  power-domains:
> > +    description:
> > +      A phandle and PM domain specifier for the MMCX power domain.
> > +    maxItems: 1
> > +
>
> Should you perhaps state that this is a parent domain? Or it isn't?
>
> Related to this and because this is a power domain provider, you
> should probably reference the common power-domain bindings somewhere
> here. Along the lines of this:
>
> - $ref: power-domain.yaml#
>
> As an example, you could have a look at
> Documentation/devicetree/bindings/power/pd-samsung.yaml.

I'll take a look.

>
> > +  required-opps:
> > +    description:
> > +      Performance state to use for MMCX to enable register access.
> > +    maxItems: 1
>
> According to the previous discussions, I was under the assumption that
> this property belongs to a consumer node rather than in the provider
> node, no?

It is both a consumer and a provider. It consumes SM8250_MMCX from
rpmhpd and provides MMSC_GDSC.

>
> > +
> >  required:
> >    - compatible
> >    - reg
> > @@ -64,6 +74,15 @@ required:
> >    - '#reset-cells'
> >    - '#power-domain-cells'
> >
> > +# Either both properties are present or both are absent
> > +dependencies:
> > +  power-domains:
> > +    required:
> > +      - required-opps
> > +  required-opps:
> > +    required:
> > +      - power-domains
> > +
> >  additionalProperties: false
> >
> >  examples:
> > --
> > 2.30.2
> >
>
> Kind regards
> Uffe



-- 
With best wishes
Dmitry