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Date: Thu, 8 Aug 2013 20:07:01 +0530
Message-ID: <CAKohpo=zYBVha_L7D+FWUEO=a6byeiuGtNBmh-CRhSmfkT=QrQ@mail.gmail.com>
Subject: Re: [PATCH 2/6] ARM: Tegra: Add CPU's OPPs for using cpufreq-cpu0 driver
From: Viresh Kumar <viresh.kumar@linaro.org>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: Stephen Warren <swarren@wwwdotorg.org>,
        Mark Rutland <Mark.Rutland@arm.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        linaro-kernel@lists.linaro.org, swarren@nvidia.com,
        Ian Campbell <ian.campbell@citrix.com>,
        Pawel Moll <pawel.moll@arm.com>, linux-pm@vger.kernel.org,
        patches@linaro.org, linux-kernel@vger.kernel.org,
        cpufreq@vger.kernel.org, rjw@sisk.pl,
        Rob Herring <rob.herring@calxeda.com>, mturquette@linaro.org,
        linux-arm-kernel@lists.infradead.org
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On 8 August 2013 19:52, Lucas Stach <l.stach@pengutronix.de> wrote:
> You can certainly define the mapping table in DT where a specialized
> Tegra cpufreq driver could read it in and then map frequency to voltage.
> But that's a runtime decision, as Speedo and process ID are fuse values
> and can not be represented in DT.

> The problem with this is that the hardware description now associates
> voltages with certain frequencies and even if they are not used by the
> Linux driver they are plain wrong.

Hmm. I understand.
Then we probably need mach-tegra/opp.c to call opp_add() for all such
OPPs.. Neither DT nor cpufreq driver are the right place for this.
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