linux-kernel - Re: [PATCH v3 1/2] dt-bindings: arm: cpus: Document 'qcom,freq-domain' property

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Date:   Wed, 28 Oct 2020 10:38:38 -0500
From:   Rob Herring <robh@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        rjw@...ysocki.net, viresh.kumar@...aro.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: arm: cpus: Document
 'qcom,freq-domain' property

On Mon, Oct 26, 2020 at 09:51:08AM -0500, Bjorn Andersson wrote:
> On Mon 26 Oct 09:32 CDT 2020, Rob Herring wrote:
> 
> > On Tue, Oct 20, 2020 at 09:09:43PM +0530, Manivannan Sadhasivam wrote:
> > > Add devicetree documentation for 'qcom,freq-domain' property specific
> > > to Qualcomm CPUs. This property is used to reference the CPUFREQ node
> > > along with Domain ID (0/1).
> > > 
> > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > > ---
> > >  Documentation/devicetree/bindings/arm/cpus.yaml | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/arm/cpus.yaml b/Documentation/devicetree/bindings/arm/cpus.yaml
> > > index 1222bf1831fa..f40564bf004f 100644
> > > --- a/Documentation/devicetree/bindings/arm/cpus.yaml
> > > +++ b/Documentation/devicetree/bindings/arm/cpus.yaml
> > > @@ -290,6 +290,12 @@ properties:
> > >  
> > >        * arm/msm/qcom,kpss-acc.txt
> > >  
> > > +  qcom,freq-domain:
> > > +    $ref: '/schemas/types.yaml#/definitions/phandle-array'
> > > +    description: |
> > > +      CPUs supporting freq-domain must set their "qcom,freq-domain" property
> > > +      with phandle to a cpufreq_hw node followed by the Domain ID(0/1).
> > 
> > There's no 3 patches doing the same thing. Mediatek and SCMI are the 
> > others. This will need to be common. 
> > 
> 
> This property is used by existing dtbs for Qualcomm sdm845, sm8150,
> sm8250 and sc7180 based devices, so I expect that the support for the
> existing property will stay.

Indeed. Any of these can tolerate a change here?

We should still take QCom into account for whatever is come up with for 
a common binding.

Rob