From mboxrd@z Thu Jan  1 00:00:00 1970
From: Viresh Kumar <viresh.kumar@linaro.org>
Subject: Re: [RFC] cpufreq: Add "dvfs-method" binding to probe cpufreq drivers
Date: Mon, 1 Dec 2014 13:36:00 +0530
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To: Sudeep Holla <sudeep.holla@arm.com>
Cc: Rafael Wysocki <rjw@rjwysocki.net>, "rob.herring@linaro.org" <rob.herring@linaro.org>, "linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>, "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>, Nishanth Menon <nm@ti.com>, Stephen Boyd <sboyd@codeaurora.org>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, Santosh Shilimkar <santosh.shilimkar@oracle.com>, Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>, Arnd Bergmann <arnd.bergmann@linaro.org>, Mike Turquette <mike.turquette@linaro.org>, "grant.likely@linaro.org" <grant.likely@linaro.org>, "kesavan.abhilash@gmail.com" <kesavan.abhilash@gmail.com>, Catalin Marinas <Catalin.Marinas@arm.com>, "k.chander@samsung.com" <k.chander@samsung.com>, "olof@lixom.net" <olof@lixom.net>, "ta.omasab@gmail.com" <ta.omasab@gmail.com>

On 28 November 2014 at 17:21, Sudeep Holla <sudeep.holla@arm.com> wrote:
>> - Update those platforms to check if DT has "compatible" string in CPU
>> node.
>> If yes, don't create a device as this will be created by cpufreq-dt.
>>
>
> This fixes how it will work with new DTs, how about old DTs ?
> IMO we still need the blacklist kind of logic I sent before.

Yes..

> I don't think this is something acceptable, why will someone want to
> lose a working feature with new kernel.

If some platform maintainers care for cleaner/simpler code instead
of backward compatibility ..

For example, exynos has just started to use cpufreq-dt. Probably
in 3.18 or may be 19 as well.. So, they might not care about
backward compatibility at all.. Let me see if I can come up with
a solution that looks reasonably clean.

--
viresh