Merge back earlier cpufreq material.

Conflicts:
	arch/mips/loongson/lemote-2f/clock.c
	drivers/cpufreq/intel_pstate.c

Documentation/ABI/testing/sysfs-devices-system-cpu

@@ -128,7 +128,7 @@ Description:	Discover cpuidle policy and mechanism
 
 What:		/sys/devices/system/cpu/cpu#/cpufreq/*
 Date:		pre-git history
-Contact:	cpufreq@vger.kernel.org
+Contact:	linux-pm@vger.kernel.org
 Description:	Discover and change clock speed of CPUs
 
 		Clock scaling allows you to change the clock speed of the
@@ -146,7 +146,7 @@ Description:	Discover and change clock speed of CPUs
 
 What:		/sys/devices/system/cpu/cpu#/cpufreq/freqdomain_cpus
 Date:		June 2013
-Contact:	cpufreq@vger.kernel.org
+Contact:	linux-pm@vger.kernel.org
 Description:	Discover CPUs in the same CPU frequency coordination domain
 
 		freqdomain_cpus is the list of CPUs (online+offline) that share

Documentation/cpu-freq/core.txt

@@ -20,6 +20,7 @@ Contents:
 ---------
 1.  CPUFreq core and interfaces
 2.  CPUFreq notifiers
+3.  CPUFreq Table Generation with Operating Performance Point (OPP)
 
 1. General Information
 =======================
@@ -92,3 +93,31 @@ values:
 cpu	- number of the affected CPU
 old	- old frequency
 new	- new frequency
+
+3. CPUFreq Table Generation with Operating Performance Point (OPP)
+==================================================================
+For details about OPP, see Documentation/power/opp.txt
+
+dev_pm_opp_init_cpufreq_table - cpufreq framework typically is initialized with
+	cpufreq_frequency_table_cpuinfo which is provided with the list of
+	frequencies that are available for operation. This function provides
+	a ready to use conversion routine to translate the OPP layer's internal
+	information about the available frequencies into a format readily
+	providable to cpufreq.
+
+	WARNING: Do not use this function in interrupt context.
+
+	Example:
+	 soc_pm_init()
+	 {
+		/* Do things */
+		r = dev_pm_opp_init_cpufreq_table(dev, &freq_table);
+		if (!r)
+			cpufreq_frequency_table_cpuinfo(policy, freq_table);
+		/* Do other things */
+	 }
+
+	NOTE: This function is available only if CONFIG_CPU_FREQ is enabled in
+	addition to CONFIG_PM_OPP.
+
+dev_pm_opp_free_cpufreq_table - Free up the table allocated by dev_pm_opp_init_cpufreq_table

Documentation/cpu-freq/cpu-drivers.txt

@@ -228,3 +228,22 @@ is the corresponding frequency table helper for the ->target
 stage. Just pass the values to this function, and the unsigned int
 index returns the number of the frequency table entry which contains
 the frequency the CPU shall be set to.
+
+The following macros can be used as iterators over cpufreq_frequency_table:
+
+cpufreq_for_each_entry(pos, table) - iterates over all entries of frequency
+table.
+
+cpufreq-for_each_valid_entry(pos, table) - iterates over all entries,
+excluding CPUFREQ_ENTRY_INVALID frequencies.
+Use arguments "pos" - a cpufreq_frequency_table * as a loop cursor and
+"table" - the cpufreq_frequency_table * you want to iterate over.
+
+For example:
+
+	struct cpufreq_frequency_table *pos, *driver_freq_table;
+
+	cpufreq_for_each_entry(pos, driver_freq_table) {
+		/* Do something with pos */
+		pos->frequency = ...
+	}

Documentation/cpu-freq/index.txt

@@ -35,8 +35,8 @@ Mailing List
 ------------
 There is a CPU frequency changing CVS commit and general list where
 you can report bugs, problems or submit patches. To post a message,
-send an email to cpufreq@vger.kernel.org, to subscribe go to
-http://vger.kernel.org/vger-lists.html#cpufreq and follow the
+send an email to linux-pm@vger.kernel.org, to subscribe go to
+http://vger.kernel.org/vger-lists.html#linux-pm and follow the
 instructions there.
 
 Links

Documentation/power/opp.txt

@@ -10,8 +10,7 @@ Contents
 3. OPP Search Functions
 4. OPP Availability Control Functions
 5. OPP Data Retrieval Functions
-6. Cpufreq Table Generation
-7. Data Structures
+6. Data Structures
 
 1. Introduction
 ===============
@@ -72,7 +71,6 @@ operations until that OPP could be re-enabled if possible.
 OPP library facilitates this concept in it's implementation. The following
 operational functions operate only on available opps:
 opp_find_freq_{ceil, floor}, dev_pm_opp_get_voltage, dev_pm_opp_get_freq, dev_pm_opp_get_opp_count
-and dev_pm_opp_init_cpufreq_table
 
 dev_pm_opp_find_freq_exact is meant to be used to find the opp pointer which can then
 be used for dev_pm_opp_enable/disable functions to make an opp available as required.
@@ -96,10 +94,9 @@ using RCU read locks. The opp_find_freq_{exact,ceil,floor},
 opp_get_{voltage, freq, opp_count} fall into this category.
 
 opp_{add,enable,disable} are updaters which use mutex and implement it's own
-RCU locking mechanisms. dev_pm_opp_init_cpufreq_table acts as an updater and uses
-mutex to implment RCU updater strategy. These functions should *NOT* be called
-under RCU locks and other contexts that prevent blocking functions in RCU or
-mutex operations from working.
+RCU locking mechanisms. These functions should *NOT* be called under RCU locks
+and other contexts that prevent blocking functions in RCU or mutex operations
+from working.
 
 2. Initial OPP List Registration
 ================================
@@ -311,34 +308,7 @@ dev_pm_opp_get_opp_count - Retrieve the number of available opps for a device
 		/* Do other things */
 	 }
 
-6. Cpufreq Table Generation
-===========================
-dev_pm_opp_init_cpufreq_table - cpufreq framework typically is initialized with
-	cpufreq_frequency_table_cpuinfo which is provided with the list of
-	frequencies that are available for operation. This function provides
-	a ready to use conversion routine to translate the OPP layer's internal
-	information about the available frequencies into a format readily
-	providable to cpufreq.
-
-	WARNING: Do not use this function in interrupt context.
-
-	Example:
-	 soc_pm_init()
-	 {
-		/* Do things */
-		r = dev_pm_opp_init_cpufreq_table(dev, &freq_table);
-		if (!r)
-			cpufreq_frequency_table_cpuinfo(policy, freq_table);
-		/* Do other things */
-	 }
-
-	NOTE: This function is available only if CONFIG_CPU_FREQ is enabled in
-	addition to CONFIG_PM as power management feature is required to
-	dynamically scale voltage and frequency in a system.
-
-dev_pm_opp_free_cpufreq_table - Free up the table allocated by dev_pm_opp_init_cpufreq_table
-
-7. Data Structures
+6. Data Structures
 ==================
 Typically an SoC contains multiple voltage domains which are variable. Each
 domain is represented by a device pointer. The relationship to OPP can be

MAINTAINERS

@@ -2410,7 +2410,6 @@ F:	drivers/net/ethernet/ti/cpmac.c
 CPU FREQUENCY DRIVERS
 M:	Rafael J. Wysocki <[email protected]>
 M:	Viresh Kumar <[email protected]>
-L:	[email protected]
 L:	[email protected]
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git
@@ -2421,7 +2420,6 @@ F:	include/linux/cpufreq.h
 CPU FREQUENCY DRIVERS - ARM BIG LITTLE
 M:	Viresh Kumar <[email protected]>
 M:	Sudeep Holla <[email protected]>
-L:	[email protected]
 L:	[email protected]
 W:	http://www.arm.com/products/processors/technologies/biglittleprocessing.php
 S:	Maintained

arch/arm/mach-davinci/da850.c

@@ -1092,20 +1092,21 @@ int da850_register_cpufreq(char *async_clk)
 
 static int da850_round_armrate(struct clk *clk, unsigned long rate)
 {
-	int i, ret = 0, diff;
+	int ret = 0, diff;
 	unsigned int best = (unsigned int) -1;
 	struct cpufreq_frequency_table *table = cpufreq_info.freq_table;
+	struct cpufreq_frequency_table *pos;
 
 	rate /= 1000; /* convert to kHz */
 
-	for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
-		diff = table[i].frequency - rate;
+	cpufreq_for_each_entry(pos, table) {
+		diff = pos->frequency - rate;
 		if (diff < 0)
 			diff = -diff;
 
 		if (diff < best) {
 			best = diff;
-			ret = table[i].frequency;
+			ret = pos->frequency;
 		}
 	}
 

arch/mips/loongson/lemote-2f/clock.c

@@ -91,10 +91,9 @@ EXPORT_SYMBOL(clk_put);
 
 int clk_set_rate(struct clk *clk, unsigned long rate)
 {
-	unsigned int rate_khz = rate / 1000;
+	struct cpufreq_frequency_table *pos;
 	int ret = 0;
 	int regval;
-	int i;
 
 	if (likely(clk->ops && clk->ops->set_rate)) {
 		unsigned long flags;
@@ -107,22 +106,16 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
 	if (unlikely(clk->flags & CLK_RATE_PROPAGATES))
 		propagate_rate(clk);
 
-	for (i = 0; loongson2_clockmod_table[i].frequency != CPUFREQ_TABLE_END;
-	     i++) {
-		if (loongson2_clockmod_table[i].frequency ==
-		    CPUFREQ_ENTRY_INVALID)
-			continue;
-		if (rate_khz == loongson2_clockmod_table[i].frequency)
+	cpufreq_for_each_valid_entry(pos, loongson2_clockmod_table)
+		if (rate == pos->frequency)
 			break;
-	}
-	if (rate_khz != loongson2_clockmod_table[i].frequency)
+	if (rate != pos->frequency)
 		return -ENOTSUPP;
 
 	clk->rate = rate;
 
 	regval = LOONGSON_CHIPCFG0;
-	regval = (regval & ~0x7) |
-		(loongson2_clockmod_table[i].driver_data - 1);
+	regval = (regval & ~0x7) | (pos->driver_data - 1);
 	LOONGSON_CHIPCFG0 = regval;
 
 	return ret;

drivers/base/power/opp.c

@@ -15,7 +15,6 @@
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/slab.h>
-#include <linux/cpufreq.h>
 #include <linux/device.h>
 #include <linux/list.h>
 #include <linux/rculist.h>
@@ -596,96 +595,6 @@ int dev_pm_opp_disable(struct device *dev, unsigned long freq)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
 
-#ifdef CONFIG_CPU_FREQ
-/**
- * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
- * @dev:	device for which we do this operation
- * @table:	Cpufreq table returned back to caller
- *
- * Generate a cpufreq table for a provided device- this assumes that the
- * opp list is already initialized and ready for usage.
- *
- * This function allocates required memory for the cpufreq table. It is
- * expected that the caller does the required maintenance such as freeing
- * the table as required.
- *
- * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
- * if no memory available for the operation (table is not populated), returns 0
- * if successful and table is populated.
- *
- * WARNING: It is  important for the callers to ensure refreshing their copy of
- * the table if any of the mentioned functions have been invoked in the interim.
- *
- * Locking: The internal device_opp and opp structures are RCU protected.
- * To simplify the logic, we pretend we are updater and hold relevant mutex here
- * Callers should ensure that this function is *NOT* called under RCU protection
- * or in contexts where mutex locking cannot be used.
- */
-int dev_pm_opp_init_cpufreq_table(struct device *dev,
-			    struct cpufreq_frequency_table **table)
-{
-	struct device_opp *dev_opp;
-	struct dev_pm_opp *opp;
-	struct cpufreq_frequency_table *freq_table;
-	int i = 0;
-
-	/* Pretend as if I am an updater */
-	mutex_lock(&dev_opp_list_lock);
-
-	dev_opp = find_device_opp(dev);
-	if (IS_ERR(dev_opp)) {
-		int r = PTR_ERR(dev_opp);
-		mutex_unlock(&dev_opp_list_lock);
-		dev_err(dev, "%s: Device OPP not found (%d)\n", __func__, r);
-		return r;
-	}
-
-	freq_table = kzalloc(sizeof(struct cpufreq_frequency_table) *
-			     (dev_pm_opp_get_opp_count(dev) + 1), GFP_KERNEL);
-	if (!freq_table) {
-		mutex_unlock(&dev_opp_list_lock);
-		dev_warn(dev, "%s: Unable to allocate frequency table\n",
-			__func__);
-		return -ENOMEM;
-	}
-
-	list_for_each_entry(opp, &dev_opp->opp_list, node) {
-		if (opp->available) {
-			freq_table[i].driver_data = i;
-			freq_table[i].frequency = opp->rate / 1000;
-			i++;
-		}
-	}
-	mutex_unlock(&dev_opp_list_lock);
-
-	freq_table[i].driver_data = i;
-	freq_table[i].frequency = CPUFREQ_TABLE_END;
-
-	*table = &freq_table[0];
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table);
-
-/**
- * dev_pm_opp_free_cpufreq_table() - free the cpufreq table
- * @dev:	device for which we do this operation
- * @table:	table to free
- *
- * Free up the table allocated by dev_pm_opp_init_cpufreq_table
- */
-void dev_pm_opp_free_cpufreq_table(struct device *dev,
-				struct cpufreq_frequency_table **table)
-{
-	if (!table)
-		return;
-
-	kfree(*table);
-	*table = NULL;
-}
-EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
-#endif		/* CONFIG_CPU_FREQ */
-
 /**
  * dev_pm_opp_get_notifier() - find notifier_head of the device with opp
  * @dev:	device pointer used to lookup device OPPs.

drivers/cpufreq/Kconfig.arm

@@ -5,7 +5,8 @@
 # big LITTLE core layer and glue drivers
 config ARM_BIG_LITTLE_CPUFREQ
 	tristate "Generic ARM big LITTLE CPUfreq driver"
-	depends on ARM && BIG_LITTLE && ARM_CPU_TOPOLOGY && HAVE_CLK
+	depends on (BIG_LITTLE && ARM_CPU_TOPOLOGY) || (ARM64 && SMP)
+	depends on HAVE_CLK
 	select PM_OPP
 	help
 	  This enables the Generic CPUfreq driver for ARM big.LITTLE platforms.
@@ -85,7 +86,7 @@ config ARM_EXYNOS_CPU_FREQ_BOOST_SW
 	  It allows usage of special frequencies for Samsung Exynos
 	  processors if thermal conditions are appropriate.
 
-	  It reguires, for safe operation, thermal framework with properly
+	  It requires, for safe operation, thermal framework with properly
 	  defined trip points.
 
 	  If in doubt, say N.
@@ -186,7 +187,7 @@ config ARM_S3C2416_CPUFREQ
 	  S3C2450 SoC. The S3C2416 supports changing the rate of the
 	  armdiv clock source and also entering a so called dynamic
 	  voltage scaling mode in which it is possible to reduce the
-	  core voltage of the cpu.
+	  core voltage of the CPU.
 
 	  If in doubt, say N.
 

drivers/cpufreq/Kconfig.x86

@@ -10,7 +10,7 @@ config X86_INTEL_PSTATE
 	  The driver implements an internal governor and will become
           the scaling driver and governor for Sandy bridge processors.
 
-	  When this driver is enabled it will become the perferred
+	  When this driver is enabled it will become the preferred
           scaling driver for Sandy bridge processors.
 
 	  If in doubt, say N.
@@ -52,7 +52,7 @@ config X86_ACPI_CPUFREQ_CPB
 	help
 	  The powernow-k8 driver used to provide a sysfs knob called "cpb"
 	  to disable the Core Performance Boosting feature of AMD CPUs. This
-	  file has now been superseeded by the more generic "boost" entry.
+	  file has now been superseded by the more generic "boost" entry.
 
 	  By enabling this option the acpi_cpufreq driver provides the old
 	  entry in addition to the new boost ones, for compatibility reasons.

drivers/cpufreq/Makefile

@@ -1,5 +1,7 @@
 # CPUfreq core
 obj-$(CONFIG_CPU_FREQ)			+= cpufreq.o freq_table.o
+obj-$(CONFIG_PM_OPP)			+= cpufreq_opp.o
+
 # CPUfreq stats
 obj-$(CONFIG_CPU_FREQ_STAT)             += cpufreq_stats.o