linux-kernel - Re: [PATCH v3 2/2] cpufreq: tegra: Re-model Tegra cpufreq driver

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Message-ID: <CAKohponns4B+BPPum3EN6EuXx6U+6MzOa50gMdR1BNBtxMNf0Q@mail.gmail.com>
Date:	Tue, 17 Dec 2013 12:24:42 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Bill Huang <bilhuang@...dia.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Stephen Warren <swarren@...dotorg.org>,
	thierry.reding@...il.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH v3 2/2] cpufreq: tegra: Re-model Tegra cpufreq driver

On 5 December 2013 13:14, Bill Huang <bilhuang@...dia.com> wrote:
> Re-model Tegra cpufreq driver to support all Tegra series of SoCs.
>
> * Make tegra-cpufreq.c a generic Tegra cpufreq driver.
> * Move Tegra20 specific codes into tegra20-cpufreq.c.
> * Bind Tegra cpufreq dirver with a fake device so defer probe would work
>   when we're going to get regulator in the driver to support voltage
>   scaling (DVFS).

I strongly feel we must reuse cpufreq-cpu0 driver here after adding a
clk/regulator driver for tegra to support all that.

@Stephen: If you want we can keep all that tegra specific stuff
(clk/regulator) in
tegra-cpufreq.c, but we can easily use cpufreq-cpu0 driver without much
complications..

I have tried it earlier, got some comments and then got busy in other stuff..
https://lkml.org/lkml/2013/8/7/364

>  static int tegra_cpu_exit(struct cpufreq_policy *policy)
>  {
> -       clk_disable_unprepare(cpu_clk);
> -       clk_disable_unprepare(emc_clk);
> +       cpufreq_frequency_table_cpuinfo(policy, tegra_data->freq_table);

Btw, why do you need this here?
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