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authorLinus Torvalds <torvalds@linux-foundation.org>2011-07-24 20:56:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-24 20:56:18 -0700
commit8405b044e5238afebd7248d927c1d261d2239767 (patch)
tree56c6a3c1a4542ead63b4abdd9fe6629d849402d5
parentee05eff6f79c25617e5b7d7677b8f79d26abbe37 (diff)
parent133de1211982bd2ba9ab401f7a73d25d052ccd61 (diff)
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq: [CPUFREQ] s5pv210: make needlessly global symbols static [CPUFREQ] exynos4210: make needlessly global symbols static [CPUFREQ] S3C6410: Add some lower frequencies for 800MHz base clock operation [CPUFREQ] S5PV210: Add reboot notifier to prevent system hang [CPUFREQ] S5PV210: Adjust udelay prior to voltage scaling down [CPUFREQ] S5PV210: Lock a mutex while changing the cpu frequency [CPUFREQ] S5PV210: Add pm_notifier to prevent system unstable [CPUFREQ] S5PV210: Add arm/int voltage control support [CPUFREQ] S5PV210: Add additional symantics for "relation" in cpufreq with pm [CPUFREQ] S3C64xx: Notify transition complete as soon as frequency changed [CPUFREQ] S3C6410: Support 800MHz operation in cpufreq [CPUFREQ] s5pv210-cpufreq.c: Add missing clk_put [CPUFREQ] Move compile for S3C64XX cpufreq to /drivers/cpufreq [CPUFREQ] Remove some vi noise that escaped into the Makefile. [CPUFREQ] Move ARM Samsung cpufreq drivers to drivers/cpufreq/ [CPUFREQ/S3C64xx] Move S3C64xx CPUfreq driver into drivers/cpufreq [CPUFREQ] Handle CPUs with different capabilities in acpi-cpufreq
-rw-r--r--arch/arm/Kconfig4
-rw-r--r--arch/arm/mach-exynos4/Makefile1
-rw-r--r--arch/arm/mach-s3c64xx/Makefile4
-rw-r--r--arch/arm/mach-s5pv210/Makefile1
-rw-r--r--drivers/cpufreq/Kconfig5
-rw-r--r--drivers/cpufreq/Kconfig.arm32
-rw-r--r--drivers/cpufreq/Makefile8
-rw-r--r--drivers/cpufreq/acpi-cpufreq.c2
-rw-r--r--drivers/cpufreq/exynos4210-cpufreq.c (renamed from arch/arm/mach-exynos4/cpufreq.c)9
-rw-r--r--drivers/cpufreq/s3c64xx-cpufreq.c (renamed from arch/arm/mach-s3c64xx/cpufreq.c)11
-rw-r--r--drivers/cpufreq/s5pv210-cpufreq.c (renamed from arch/arm/mach-s5pv210/cpufreq.c)210
11 files changed, 241 insertions, 46 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1478c6171b00..83a7aa2ca57a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1895,10 +1895,6 @@ config CPU_FREQ_PXA
default y
select CPU_FREQ_DEFAULT_GOV_USERSPACE
-config CPU_FREQ_S3C64XX
- bool "CPUfreq support for Samsung S3C64XX CPUs"
- depends on CPU_FREQ && CPU_S3C6410
-
config CPU_FREQ_S3C
bool
help
diff --git a/arch/arm/mach-exynos4/Makefile b/arch/arm/mach-exynos4/Makefile
index 60fe5ecf3599..1366995d8c2c 100644
--- a/arch/arm/mach-exynos4/Makefile
+++ b/arch/arm/mach-exynos4/Makefile
@@ -15,7 +15,6 @@ obj- :=
obj-$(CONFIG_CPU_EXYNOS4210) += cpu.o init.o clock.o irq-combiner.o
obj-$(CONFIG_CPU_EXYNOS4210) += setup-i2c0.o irq-eint.o dma.o
obj-$(CONFIG_PM) += pm.o sleep.o
-obj-$(CONFIG_CPU_FREQ) += cpufreq.o
obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_SMP) += platsmp.o headsmp.o
diff --git a/arch/arm/mach-s3c64xx/Makefile b/arch/arm/mach-s3c64xx/Makefile
index 4657363f0674..f5a7144a052f 100644
--- a/arch/arm/mach-s3c64xx/Makefile
+++ b/arch/arm/mach-s3c64xx/Makefile
@@ -23,10 +23,6 @@ obj-$(CONFIG_CPU_S3C6410) += s3c6410.o
obj-y += irq.o
obj-y += irq-eint.o
-# CPU frequency scaling
-
-obj-$(CONFIG_CPU_FREQ_S3C64XX) += cpufreq.o
-
# DMA support
obj-$(CONFIG_S3C64XX_DMA) += dma.o
diff --git a/arch/arm/mach-s5pv210/Makefile b/arch/arm/mach-s5pv210/Makefile
index 50907aca006c..599a3c0e8f6c 100644
--- a/arch/arm/mach-s5pv210/Makefile
+++ b/arch/arm/mach-s5pv210/Makefile
@@ -15,7 +15,6 @@ obj- :=
obj-$(CONFIG_CPU_S5PV210) += cpu.o init.o clock.o dma.o
obj-$(CONFIG_CPU_S5PV210) += setup-i2c0.o
obj-$(CONFIG_S5PV210_PM) += pm.o sleep.o
-obj-$(CONFIG_CPU_FREQ) += cpufreq.o
# machine support
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index 9fb84853d8e3..e898215b88af 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -184,5 +184,10 @@ depends on X86
source "drivers/cpufreq/Kconfig.x86"
endmenu
+menu "ARM CPU frequency scaling drivers"
+depends on ARM
+source "drivers/cpufreq/Kconfig.arm"
+endmenu
+
endif
endmenu
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
new file mode 100644
index 000000000000..72a0044c1baa
--- /dev/null
+++ b/drivers/cpufreq/Kconfig.arm
@@ -0,0 +1,32 @@
+#
+# ARM CPU Frequency scaling drivers
+#
+
+config ARM_S3C64XX_CPUFREQ
+ bool "Samsung S3C64XX"
+ depends on CPU_S3C6410
+ default y
+ help
+ This adds the CPUFreq driver for Samsung S3C6410 SoC.
+
+ If in doubt, say N.
+
+config ARM_S5PV210_CPUFREQ
+ bool "Samsung S5PV210 and S5PC110"
+ depends on CPU_S5PV210
+ default y
+ help
+ This adds the CPUFreq driver for Samsung S5PV210 and
+ S5PC110 SoCs.
+
+ If in doubt, say N.
+
+config ARM_EXYNOS4210_CPUFREQ
+ bool "Samsung EXYNOS4210"
+ depends on CPU_EXYNOS4210
+ default y
+ help
+ This adds the CPUFreq driver for Samsung EXYNOS4210
+ SoC (S5PV310 or S5PC210).
+
+ If in doubt, say N.
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index e2fc2d21fa61..ab75e573c69f 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -13,7 +13,7 @@ obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) += cpufreq_conservative.o
# CPUfreq cross-arch helpers
obj-$(CONFIG_CPU_FREQ_TABLE) += freq_table.o
-##################################################################################d
+##################################################################################
# x86 drivers.
# Link order matters. K8 is preferred to ACPI because of firmware bugs in early
# K8 systems. ACPI is preferred to all other hardware-specific drivers.
@@ -37,7 +37,9 @@ obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO) += speedstep-centrino.o
obj-$(CONFIG_X86_P4_CLOCKMOD) += p4-clockmod.o
obj-$(CONFIG_X86_CPUFREQ_NFORCE2) += cpufreq-nforce2.o
-##################################################################################d
-
+##################################################################################
# ARM SoC drivers
obj-$(CONFIG_UX500_SOC_DB8500) += db8500-cpufreq.o
+obj-$(CONFIG_ARM_S3C64XX_CPUFREQ) += s3c64xx-cpufreq.o
+obj-$(CONFIG_ARM_S5PV210_CPUFREQ) += s5pv210-cpufreq.o
+obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ) += exynos4210-cpufreq.o
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 596d5dd32f41..56c6c6b4eb4d 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -655,7 +655,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
acpi_processor_notify_smm(THIS_MODULE);
/* Check for APERF/MPERF support in hardware */
- if (cpu_has(c, X86_FEATURE_APERFMPERF))
+ if (boot_cpu_has(X86_FEATURE_APERFMPERF))
acpi_cpufreq_driver.getavg = cpufreq_get_measured_perf;
pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
diff --git a/arch/arm/mach-exynos4/cpufreq.c b/drivers/cpufreq/exynos4210-cpufreq.c
index a1bd258f0c4d..b7c3a84c4cfa 100644
--- a/arch/arm/mach-exynos4/cpufreq.c
+++ b/drivers/cpufreq/exynos4210-cpufreq.c
@@ -1,5 +1,4 @@
-/* linux/arch/arm/mach-exynos4/cpufreq.c
- *
+/*
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
@@ -192,17 +191,17 @@ static unsigned int exynos4_apll_pms_table[CPUFREQ_LEVEL_END] = {
((200 << 16) | (6 << 8) | 4),
};
-int exynos4_verify_speed(struct cpufreq_policy *policy)
+static int exynos4_verify_speed(struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, exynos4_freq_table);
}
-unsigned int exynos4_getspeed(unsigned int cpu)
+static unsigned int exynos4_getspeed(unsigned int cpu)
{
return clk_get_rate(cpu_clk) / 1000;
}
-void exynos4_set_clkdiv(unsigned int div_index)
+static void exynos4_set_clkdiv(unsigned int div_index)
{
unsigned int tmp;
diff --git a/arch/arm/mach-s3c64xx/cpufreq.c b/drivers/cpufreq/s3c64xx-cpufreq.c
index 4375b97588b8..b8d1d205e1ef 100644
--- a/arch/arm/mach-s3c64xx/cpufreq.c
+++ b/drivers/cpufreq/s3c64xx-cpufreq.c
@@ -1,5 +1,4 @@
-/* linux/arch/arm/plat-s3c64xx/cpufreq.c
- *
+/*
* Copyright 2009 Wolfson Microelectronics plc
*
* S3C64xx CPUfreq Support
@@ -32,11 +31,14 @@ static struct s3c64xx_dvfs s3c64xx_dvfs_table[] = {
[1] = { 1050000, 1150000 },
[2] = { 1100000, 1150000 },
[3] = { 1200000, 1350000 },
+ [4] = { 1300000, 1350000 },
};
static struct cpufreq_frequency_table s3c64xx_freq_table[] = {
{ 0, 66000 },
+ { 0, 100000 },
{ 0, 133000 },
+ { 1, 200000 },
{ 1, 222000 },
{ 1, 266000 },
{ 2, 333000 },
@@ -44,6 +46,7 @@ static struct cpufreq_frequency_table s3c64xx_freq_table[] = {
{ 2, 532000 },
{ 2, 533000 },
{ 3, 667000 },
+ { 4, 800000 },
{ 0, CPUFREQ_TABLE_END },
};
#endif
@@ -111,6 +114,8 @@ static int s3c64xx_cpufreq_set_target(struct cpufreq_policy *policy,
goto err;
}
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
#ifdef CONFIG_REGULATOR
if (vddarm && freqs.new < freqs.old) {
ret = regulator_set_voltage(vddarm,
@@ -124,8 +129,6 @@ static int s3c64xx_cpufreq_set_target(struct cpufreq_policy *policy,
}
#endif
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
-
pr_debug("cpufreq: Set actual frequency %lukHz\n",
clk_get_rate(armclk) / 1000);
diff --git a/arch/arm/mach-s5pv210/cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index 153af8b359ec..a484aaea9809 100644
--- a/arch/arm/mach-s5pv210/cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -1,5 +1,4 @@
-/* linux/arch/arm/mach-s5pv210/cpufreq.c
- *
+/*
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
@@ -17,6 +16,9 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/cpufreq.h>
+#include <linux/reboot.h>
+#include <linux/regulator/consumer.h>
+#include <linux/suspend.h>
#include <mach/map.h>
#include <mach/regs-clock.h>
@@ -25,11 +27,27 @@ static struct clk *cpu_clk;
static struct clk *dmc0_clk;
static struct clk *dmc1_clk;
static struct cpufreq_freqs freqs;
+static DEFINE_MUTEX(set_freq_lock);
/* APLL M,P,S values for 1G/800Mhz */
#define APLL_VAL_1000 ((1 << 31) | (125 << 16) | (3 << 8) | 1)
#define APLL_VAL_800 ((1 << 31) | (100 << 16) | (3 << 8) | 1)
+/* Use 800MHz when entering sleep mode */
+#define SLEEP_FREQ (800 * 1000)
+
+/*
+ * relation has an additional symantics other than the standard of cpufreq
+ * DISALBE_FURTHER_CPUFREQ: disable further access to target
+ * ENABLE_FURTUER_CPUFREQ: enable access to target
+ */
+enum cpufreq_access {
+ DISABLE_FURTHER_CPUFREQ = 0x10,
+ ENABLE_FURTHER_CPUFREQ = 0x20,
+};
+
+static bool no_cpufreq_access;
+
/*
* DRAM configurations to calculate refresh counter for changing
* frequency of memory.
@@ -66,6 +84,40 @@ static struct cpufreq_frequency_table s5pv210_freq_table[] = {
{0, CPUFREQ_TABLE_END},
};
+static struct regulator *arm_regulator;
+static struct regulator *int_regulator;
+
+struct s5pv210_dvs_conf {
+ int arm_volt; /* uV */
+ int int_volt; /* uV */
+};
+
+static const int arm_volt_max = 1350000;
+static const int int_volt_max = 1250000;
+
+static struct s5pv210_dvs_conf dvs_conf[] = {
+ [L0] = {
+ .arm_volt = 1250000,
+ .int_volt = 1100000,
+ },
+ [L1] = {
+ .arm_volt = 1200000,
+ .int_volt = 1100000,
+ },
+ [L2] = {
+ .arm_volt = 1050000,
+ .int_volt = 1100000,
+ },
+ [L3] = {
+ .arm_volt = 950000,
+ .int_volt = 1100000,
+ },
+ [L4] = {
+ .arm_volt = 950000,
+ .int_volt = 1000000,
+ },
+};
+
static u32 clkdiv_val[5][11] = {
/*
* Clock divider value for following
@@ -122,7 +174,7 @@ static void s5pv210_set_refresh(enum s5pv210_dmc_port ch, unsigned long freq)
__raw_writel(tmp1, reg);
}
-int s5pv210_verify_speed(struct cpufreq_policy *policy)
+static int s5pv210_verify_speed(struct cpufreq_policy *policy)
{
if (policy->cpu)
return -EINVAL;
@@ -130,7 +182,7 @@ int s5pv210_verify_speed(struct cpufreq_policy *policy)
return cpufreq_frequency_table_verify(policy, s5pv210_freq_table);
}
-unsigned int s5pv210_getspeed(unsigned int cpu)
+static unsigned int s5pv210_getspeed(unsigned int cpu)
{
if (cpu)
return 0;
@@ -146,30 +198,66 @@ static int s5pv210_target(struct cpufreq_policy *policy,
unsigned int index, priv_index;
unsigned int pll_changing = 0;
unsigned int bus_speed_changing = 0;
+ int arm_volt, int_volt;
+ int ret = 0;
+
+ mutex_lock(&set_freq_lock);
+
+ if (relation & ENABLE_FURTHER_CPUFREQ)
+ no_cpufreq_access = false;
+
+ if (no_cpufreq_access) {
+#ifdef CONFIG_PM_VERBOSE
+ pr_err("%s:%d denied access to %s as it is disabled"
+ "temporarily\n", __FILE__, __LINE__, __func__);
+#endif
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ if (relation & DISABLE_FURTHER_CPUFREQ)
+ no_cpufreq_access = true;
+
+ relation &= ~(ENABLE_FURTHER_CPUFREQ | DISABLE_FURTHER_CPUFREQ);
freqs.old = s5pv210_getspeed(0);
if (cpufreq_frequency_table_target(policy, s5pv210_freq_table,
- target_freq, relation, &index))
- return -EINVAL;
+ target_freq, relation, &index)) {
+ ret = -EINVAL;
+ goto exit;
+ }
freqs.new = s5pv210_freq_table[index].frequency;
freqs.cpu = 0;
if (freqs.new == freqs.old)
- return 0;
+ goto exit;
/* Finding current running level index */
if (cpufreq_frequency_table_target(policy, s5pv210_freq_table,
- freqs.old, relation, &priv_index))
- return -EINVAL;
+ freqs.old, relation, &priv_index)) {
+ ret = -EINVAL;
+ goto exit;
+ }
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ arm_volt = dvs_conf[index].arm_volt;
+ int_volt = dvs_conf[index].int_volt;
if (freqs.new > freqs.old) {
- /* Voltage up: will be implemented */
+ ret = regulator_set_voltage(arm_regulator,
+ arm_volt, arm_volt_max);
+ if (ret)
+ goto exit;
+
+ ret = regulator_set_voltage(int_regulator,
+ int_volt, int_volt_max);
+ if (ret)
+ goto exit;
}
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
/* Check if there need to change PLL */
if ((index == L0) || (priv_index == L0))
pll_changing = 1;
@@ -380,15 +468,21 @@ static int s5pv210_target(struct cpufreq_policy *policy,
}
}
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
if (freqs.new < freqs.old) {
- /* Voltage down: will be implemented */
- }
+ regulator_set_voltage(int_regulator,
+ int_volt, int_volt_max);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ regulator_set_voltage(arm_regulator,
+ arm_volt, arm_volt_max);
+ }
printk(KERN_DEBUG "Perf changed[L%d]\n", index);
- return 0;
+exit:
+ mutex_unlock(&set_freq_lock);
+ return ret;
}
#ifdef CONFIG_PM
@@ -416,6 +510,7 @@ static int check_mem_type(void __iomem *dmc_reg)
static int __init s5pv210_cpu_init(struct cpufreq_policy *policy)
{
unsigned long mem_type;
+ int ret;
cpu_clk = clk_get(NULL, "armclk");
if (IS_ERR(cpu_clk))
@@ -423,19 +518,20 @@ static int __init s5pv210_cpu_init(struct cpufreq_policy *policy)
dmc0_clk = clk_get(NULL, "sclk_dmc0");
if (IS_ERR(dmc0_clk)) {
- clk_put(cpu_clk);
- return PTR_ERR(dmc0_clk);
+ ret = PTR_ERR(dmc0_clk);
+ goto out_dmc0;
}
dmc1_clk = clk_get(NULL, "hclk_msys");
if (IS_ERR(dmc1_clk)) {
- clk_put(dmc0_clk);
- clk_put(cpu_clk);
- return PTR_ERR(dmc1_clk);
+ ret = PTR_ERR(dmc1_clk);
+ goto out_dmc1;
}
- if (policy->cpu != 0)
- return -EINVAL;
+ if (policy->cpu != 0) {
+ ret = -EINVAL;
+ goto out_dmc1;
+ }
/*
* check_mem_type : This driver only support LPDDR & LPDDR2.
@@ -445,7 +541,8 @@ static int __init s5pv210_cpu_init(struct cpufreq_policy *policy)
if ((mem_type != LPDDR) && (mem_type != LPDDR2)) {
printk(KERN_ERR "CPUFreq doesn't support this memory type\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto out_dmc1;
}
/* Find current refresh counter and frequency each DMC */
@@ -462,6 +559,49 @@ static int __init s5pv210_cpu_init(struct cpufreq_policy *policy)
policy->cpuinfo.transition_latency = 40000;
return cpufreq_frequency_table_cpuinfo(policy, s5pv210_freq_table);
+
+out_dmc1:
+ clk_put(dmc0_clk);
+out_dmc0:
+ clk_put(cpu_clk);
+ return ret;
+}
+
+static int s5pv210_cpufreq_notifier_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ int ret;
+
+ switch (event) {
+ case PM_SUSPEND_PREPARE:
+ ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ,
+ DISABLE_FURTHER_CPUFREQ);
+ if (ret < 0)
+ return NOTIFY_BAD;
+
+ return NOTIFY_OK;
+ case PM_POST_RESTORE:
+ case PM_POST_SUSPEND:
+ cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ,
+ ENABLE_FURTHER_CPUFREQ);
+
+ return NOTIFY_OK;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static int s5pv210_cpufreq_reboot_notifier_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ int ret;
+
+ ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ,
+ DISABLE_FURTHER_CPUFREQ);
+ if (ret < 0)
+ return NOTIFY_BAD;
+
+ return NOTIFY_DONE;
}
static struct cpufreq_driver s5pv210_driver = {
@@ -477,8 +617,32 @@ static struct cpufreq_driver s5pv210_driver = {
#endif
};
+static struct notifier_block s5pv210_cpufreq_notifier = {
+ .notifier_call = s5pv210_cpufreq_notifier_event,
+};
+
+static struct notifier_block s5pv210_cpufreq_reboot_notifier = {
+ .notifier_call = s5pv210_cpufreq_reboot_notifier_event,
+};
+
static int __init s5pv210_cpufreq_init(void)
{
+ arm_regulator = regulator_get(NULL, "vddarm");
+ if (IS_ERR(arm_regulator)) {
+ pr_err("failed to get regulator vddarm");
+ return PTR_ERR(arm_regulator);
+ }
+
+ int_regulator = regulator_get(NULL, "vddint");
+ if (IS_ERR(int_regulator)) {
+ pr_err("failed to get regulator vddint");
+ regulator_put(arm_regulator);
+ return PTR_ERR(int_regulator);
+ }
+
+ register_pm_notifier(&s5pv210_cpufreq_notifier);
+ register_reboot_notifier(&s5pv210_cpufreq_reboot_notifier);
+
return cpufreq_register_driver(&s5pv210_driver);
}