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Message-ID: <CAJ0PZbSO7n7P0r_i+tOWmxtzxx0T9kTRgnC2eLXn9m69k5HsKw@mail.gmail.com> Date: Mon, 14 Nov 2011 16:57:24 +0900 From: MyungJoo Ham <myungjoo.ham@...sung.com> To: Linux PM mailing list <linux-pm@...ts.linux-foundation.org>, LKML <linux-kernel@...r.kernel.org> Cc: "Rafael J. Wysocki" <rjw@...k.pl>, "Hilman, Kevin" <khilman@...com>, "Turquette, Mike" <mturquette@...com>, Kyungmin Park <kyungmin.park@...sung.com> Subject: [PATCH] PM / devfreq: correct Kconfig dependency 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> --- 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 -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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