linux-kernel - Re: [PATCH v13 1/2] dt-bindings: cpufreq: add bindings for MediaTek cpufreq HW

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Date:   Tue, 3 Aug 2021 13:17:30 -0600
From:   Rob Herring <robh@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Hector Yuan <hector.yuan@...iatek.com>,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        wsd_upstream@...iatek.com
Subject: Re: [PATCH v13 1/2] dt-bindings: cpufreq: add bindings for MediaTek
 cpufreq HW

On Tue, Aug 03, 2021 at 10:35:38AM +0530, Viresh Kumar wrote:
> On 30-07-21, 00:08, Hector Yuan wrote:
> > From: "Hector.Yuan" <hector.yuan@...iatek.com>
> > 
> > Add devicetree bindings for MediaTek HW driver.
> > 
> > Signed-off-by: Hector.Yuan <hector.yuan@...iatek.com>
> > ---
> >  .../bindings/cpufreq/cpufreq-mediatek-hw.yaml      |   70 ++++++++++++++++++++
> >  1 file changed, 70 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml
> > new file mode 100644
> > index 0000000..6bb2c97
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml
> > @@ -0,0 +1,70 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/cpufreq/cpufreq-mediatek-hw.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: MediaTek's CPUFREQ Bindings
> > +
> > +maintainers:
> > +  - Hector Yuan <hector.yuan@...iatek.com>
> > +
> > +description:
> > +  CPUFREQ HW is a hardware engine used by MediaTek
> > +  SoCs to manage frequency in hardware. It is capable of controlling frequency
> > +  for multiple clusters.
> > +
> 
> Should this somewhere have a reference to
> Documentation/devicetree/bindings/dvfs/performance-domain.yaml ?
> 
> > +properties:
> > +  compatible:
> > +    const: mediatek,cpufreq-hw
> > +
> > +  reg:
> > +    minItems: 1
> > +    maxItems: 2
> > +    description: |
> > +      Addresses and sizes for the memory of the
> > +      HW bases in each frequency domain.
> > +
> > +  "#performance-domain-cells":
> > +    description:
> > +      Number of cells in a performance domain specifier. Typically 1 for nodes
> > +      providing multiple performance domains (e.g. performance controllers),
> > +      but can be any value as specified by device tree binding documentation
> > +      of particular provider.
> 
> You say this can have any value, 1 or more, but then ...
> 
> > +    const: 1
> 
> You fix it to 1 ?
> 
> Perhaps you should add a reference to the performance-domain.yaml here
> as well, and say const 1 here and describe how the parameter is going
> to be used. You should only explain it in respect to your SoC.

Correct in terms of what should be described, but no need to reference 
performance-domain.yaml.

Rob