linux-kernel - Re: [PATCH] PM / devfreq: correct Kconfig dependency

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Date:	Tue, 15 Nov 2011 00:16:51 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	myungjoo.ham@...il.com
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Hilman, Kevin" <khilman@...com>,
	"Turquette, Mike" <mturquette@...com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH] PM / devfreq: correct Kconfig dependency

On Monday, November 14, 2011, MyungJoo Ham wrote:
> Devfreq does not depend on OPP. The dependency is removed.
> 
> Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>

Applied to linux-pm/pm-fixes.

Thanks,
Rafael


> ---
>  drivers/devfreq/Kconfig |   41 +++++++++++++++++------------------------
>  1 files changed, 17 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
> index 8fd34e7..87a742f 100644
> --- a/drivers/devfreq/Kconfig
> +++ b/drivers/devfreq/Kconfig
> @@ -1,36 +1,29 @@
> -config ARCH_HAS_DEVFREQ
> -	bool
> -	depends on ARCH_HAS_OPP
> -	help
> -	  Denotes that the architecture supports DEVFREQ. If the architecture
> -	  supports multiple OPP entries per device and the frequency of the
> -	  devices with OPPs may be altered dynamically, the architecture
> -	  supports DEVFREQ.
> -
>  menuconfig PM_DEVFREQ
>  	bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
> -	depends on PM_OPP && ARCH_HAS_DEVFREQ
>  	help
> -	  With OPP support, a device may have a list of frequencies and
> -	  voltages available. DEVFREQ, a generic DVFS framework can be
> -	  registered for a device with OPP support in order to let the
> -	  governor provided to DEVFREQ choose an operating frequency
> -	  based on the OPP's list and the policy given with DEVFREQ.
> +	  A device may have a list of frequencies and voltages available.
> +	  devfreq, a generic DVFS framework can be registered for a device
> +	  in order to let the governor provided to devfreq choose an
> +	  operating frequency based on the device driver's policy.
> 
> -	  Each device may have its own governor and policy. DEVFREQ can
> +	  Each device may have its own governor and policy. Devfreq can
>  	  reevaluate the device state periodically and/or based on the
> -	  OPP list changes (each frequency/voltage pair in OPP may be
> -	  disabled or enabled).
> +	  notification to "nb", a notifier block, of devfreq.
> 
> -	  Like some CPUs with CPUFREQ, a device may have multiple clocks.
> +	  Like some CPUs with CPUfreq, a device may have multiple clocks.
>  	  However, because the clock frequencies of a single device are
> -	  determined by the single device's state, an instance of DEVFREQ
> +	  determined by the single device's state, an instance of devfreq
>  	  is attached to a single device and returns a "representative"
> -	  clock frequency from the OPP of the device, which is also attached
> -	  to a device by 1-to-1. The device registering DEVFREQ takes the
> -	  responsiblity to "interpret" the frequency listed in OPP and
> +	  clock frequency of the device, which is also attached
> +	  to a device by 1-to-1. The device registering devfreq takes the
> +	  responsiblity to "interpret" the representative frequency and
>  	  to set its every clock accordingly with the "target" callback
> -	  given to DEVFREQ.
> +	  given to devfreq.
> +
> +	  When OPP is used with the devfreq device, it is recommended to
> +	  register devfreq's nb to the OPP's notifier head.  If OPP is
> +	  used with the devfreq device, you may use OPP helper
> +	  functions defined in devfreq.h.
> 
>  if PM_DEVFREQ
> 
> 

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