linux-kernel - Re: R: [PATCH v2 2/2] dt-bindings: opp: Fix wrong binding in qcom-nvmem-cpufreq

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Date:   Mon, 27 Apr 2020 09:19:51 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     ansuelsmth@...il.com
Cc:     'Rob Herring' <robh+dt@...nel.org>,
        'Viresh Kumar' <vireshk@...nel.org>,
        'Andy Gross' <agross@...nel.org>,
        'Bjorn Andersson' <bjorn.andersson@...aro.org>,
        'Ilia Lin' <ilia.lin@...nel.org>, 'Nishanth Menon' <nm@...com>,
        'Stephen Boyd' <sboyd@...nel.org>,
        "'Rafael J. Wysocki'" <rjw@...ysocki.net>,
        'Sricharan R' <sricharan@...eaurora.org>,
        'linux-arm-msm' <linux-arm-msm@...r.kernel.org>,
        "'open list:THERMAL'" <linux-pm@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: R: [PATCH v2 2/2] dt-bindings: opp: Fix wrong binding in
 qcom-nvmem-cpufreq

On 25-04-20, 00:19, ansuelsmth@...il.com wrote:
> > On Wed, Apr 22, 2020 at 3:12 PM Ansuel Smith <ansuelsmth@...il.com>
> > wrote:
> > >
> > > Update binding to new generic name "operating-points-v2-qcom-cpu"
> > >
> > > Fixes: a8811ec764f9 ("cpufreq: qcom: Add support for krait based socs")
> > > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > > ---
> > >  Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt | 2
> > +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/opp/qcom-nvmem-
> > cpufreq.txt b/Documentation/devicetree/bindings/opp/qcom-nvmem-
> > cpufreq.txt
> > > index 64f07417ecfb..537e1774f589 100644
> > > --- a/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
> > > +++ b/Documentation/devicetree/bindings/opp/qcom-nvmem-
> > cpufreq.txt
> > > @@ -19,7 +19,7 @@ In 'cpu' nodes:
> > >
> > >  In 'operating-points-v2' table:
> > >  - compatible: Should be
> > > -       - 'operating-points-v2-kryo-cpu' for apq8096, msm8996, msm8974,
> > > +       - 'operating-points-v2-qcom-cpu' for apq8096, msm8996,
> > msm8974,
> > >                                              apq8064, ipq8064, msm8960 and ipq8074.
> > 
> > This is not how you fix the backwards compatibility issue pointed out
> > on the Fixes reference.
> > 
> > Rob
> 
> Sorry but can you give some directive? Should I use the old binding and change
> the driver to use it instead of the new one (and drop it) ?

It is not about the name of the binding, you can rename it to whatever
you want. The kernel needs to keep supporting all the previous
bindings, so we can keep on changing the kernel but keep the same
bootloader (with earlier bindings).

-- 
viresh