linux-kernel - Re: [PATCH v4 1/2] dt-bindings: cpufreq: add virtual cpufreq device

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Message-ID: <20231116162245.GA2424810-robh@kernel.org>
Date:   Thu, 16 Nov 2023 10:22:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     David Dai <davidai@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Saravana Kannan <saravanak@...gle.com>,
        Quentin Perret <qperret@...gle.com>,
        Masami Hiramatsu <mhiramat@...gle.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Pavan Kondeti <quic_pkondeti@...cinc.com>,
        Gupta Pankaj <pankaj.gupta@....com>,
        Mel Gorman <mgorman@...e.de>, kernel-team@...roid.com,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] dt-bindings: cpufreq: add virtual cpufreq device

On Wed, Nov 15, 2023 at 11:57:41AM +0530, Viresh Kumar wrote:
> On 10-11-23, 17:49, David Dai wrote:
> > diff --git a/Documentation/devicetree/bindings/cpufreq/qemu,cpufreq-virtual.yaml b/Documentation/devicetree/bindings/cpufreq/qemu,cpufreq-virtual.yaml
> > +$id: http://devicetree.org/schemas/cpufreq/qemu,cpufreq-virtual.yaml#
> > +properties:
> > +  compatible:
> > +    const: qemu,virtual-cpufreq
> 
> Not sure why we need to mention QEMU here.. Why limit this to just QEMU ?

Because that is the implementation. And also to discourage anyone from 
using this on their hardware or thinking it is generic and the way to 
extend it to another implementation is adding properties.

Rob