linux-kernel - Re: [PATCH v5 1/1] cpufreq: tegra: Re-model Tegra20 cpufreq driver

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Message-ID: <CAKohpomCPJYd+d_NnM9gxwQ7bH6C6=iLxbiWZbfNcjZ8Bi+2wA@mail.gmail.com>
Date:	Fri, 20 Dec 2013 15:01:40 +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 <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" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v5 1/1] cpufreq: tegra: Re-model Tegra20 cpufreq driver

On 19 December 2013 16:48, Bill Huang <bilhuang@...dia.com> wrote:
> diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
> index ce52ed9..22dfc43 100644
> --- a/drivers/cpufreq/Kconfig.arm
> +++ b/drivers/cpufreq/Kconfig.arm
> @@ -225,6 +225,18 @@ config ARM_TEGRA_CPUFREQ
>         help
>           This adds the CPUFreq driver support for TEGRA SOCs.
>
> +config ARM_TEGRA20_CPUFREQ
> +       bool "NVIDIA TEGRA20"
> +       depends on ARM_TEGRA_CPUFREQ && ARCH_TEGRA_2x_SOC

Probably just in case you agree to my next comment:

            depends on ARCH_TEGRA_2x_SOC


> +       default y
> +       help
> +         This enables Tegra20 cpufreq functionality, it adds
> +         Tegra20 CPU frequency ladder and the call back functions
> +         to set CPU rate. All the non-SoC dependant codes are
> +         controlled by the config ARM_TEGRA_CPUFREQ.
> +
> +         If in doubt, say N.


> diff --git a/drivers/cpufreq/tegra-cpufreq.c b/drivers/cpufreq/tegra-cpufreq.c
>  /*
> + * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
>   *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
>   *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
>   */
>
>  #include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/tegra-cpufreq.h>
> +
> +int __init tegra_cpufreq_init(void)
> +{
> +       struct device_node *root;
> +
> +       root = of_find_node_by_path("/");
> +       if (root) {
> +               struct platform_device_info devinfo;
> +               const char *compat;
> +               int i;
> +
> +               memset(&devinfo, 0, sizeof(devinfo));
> +               i = of_property_count_strings(root, "compatible");
> +               if (i > 0) {
> +                       of_property_read_string_index(
> +                               root, "compatible", i - 1, &compat);
> +                       devinfo.name = kasprintf(
> +                                       GFP_KERNEL, "%s-cpufreq", compat);
> +                       platform_device_register_full(&devinfo);
> +               }
>         }
> +EXPORT_SYMBOL(tegra_cpufreq_init);

Probably above is all that is present in this file. This is just about adding
the right cpufreq device so that right driver can get probed.

I don't think this code is present at the right place. We don't need a file
in cpufreq/ which is there just to add a device :) ..

Probably move this piece of code to arch/mach-tegra where you are calling
init.

And so remove ARM_TEGRA_CPUFREQ config option completely.
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