linux-kernel - Re: [PATCH, RFC 02/22] cpufreq: ARM_DT_BL_CPUFREQ needs ARM_CPU

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Date:	Fri, 3 May 2013 10:21:45 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH, RFC 02/22] cpufreq: ARM_DT_BL_CPUFREQ needs ARM_CPU_TOPOLOGY

On 2 May 2013 20:46, Arnd Bergmann <arnd@...db.de> wrote:
> The big.LITTLE cpufreq driver uses the CPU topology API, which
> needs to be reflected in Kconfig to prevent broken configurations.
>
> warning: (ARM_DT_BL_CPUFREQ) selects ARM_BIG_LITTLE_CPUFREQ which
> has unmet direct dependencies (ARCH_HAS_CPUFREQ && CPU_FREQ && ARM && ARM_CPU_TOPOLOGY)
>
> Cc: Rafael J. Wysocki <rjw@...k.pl>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Cc: cpufreq@...r.kernel.org
> Cc: linux-pm@...r.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/cpufreq/Kconfig.arm | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
> index f3af18b..3fd6bdf 100644
> --- a/drivers/cpufreq/Kconfig.arm
> +++ b/drivers/cpufreq/Kconfig.arm
> @@ -10,6 +10,7 @@ config ARM_DT_BL_CPUFREQ
>         tristate "Generic ARM big LITTLE CPUfreq driver probed via DT"
>         select ARM_BIG_LITTLE_CPUFREQ
>         depends on OF && HAVE_CLK
> +       depends on ARM_CPU_TOPOLOGY
>         help
>           This enables the Generic CPUfreq driver for ARM big.LITTLE platform.
>           This gets frequency tables from DT.

This Kconfig thing has always been confusing to me. This is how the code looks
currently.

config ARM_BIG_LITTLE_CPUFREQ
        tristate
        depends on ARM_CPU_TOPOLOGY

config ARM_DT_BL_CPUFREQ
        tristate "Generic ARM big LITTLE CPUfreq driver probed via DT"
        select ARM_BIG_LITTLE_CPUFREQ
        depends on OF && HAVE_CLK
        help
          This enables the Generic CPUfreq driver for ARM big.LITTLE platform.
          This gets frequency tables from DT.

Because all ARM big LITTLE cpufreq stuff have dependency on
ARM_CPU_TOPOLOGY, i have added dependency at a common place. So that
we don't end up adding this in every glue layer driver. How should this be done?
--
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