[PATCH 2/3] cpufreq: exynos: Adding cpufreq driver for exynos5440
amit kachhap
amit.kachhap at gmail.com
Thu Feb 7 14:08:20 EST 2013
Hi Viresh,
Thanks for the detailed review. Will try to handle them in the next version,
On Thu, Feb 7, 2013 at 3:17 AM, Viresh Kumar <viresh.kumar at linaro.org> wrote:
> On Thu, Feb 7, 2013 at 1:09 AM, Amit Daniel Kachhap
> <amit.daniel at samsung.com> wrote:
>> This patch adds dvfs support for exynos5440 SOC. The nature of exynos5440
>> clock controller is different from previous exynos controllers so not using
>> the common exynos cpufreq framework. Also, the device tree parsing is added
>> to get different parameters like frequency, voltage etc.
>
> Some information about platform cpu configuration would be helpful.. cpus, type,
> clock lines for cpus - shared/separate?
Ok.
>
>> Signed-off-by: Amit Daniel Kachhap <amit.daniel at samsung.com>
>> ---
>> .../bindings/cpufreq/cpufreq-exynos5440.txt | 24 ++
>> drivers/cpufreq/Kconfig.arm | 8 +
>> drivers/cpufreq/Makefile | 1 +
>> drivers/cpufreq/exynos5440-cpufreq.c | 448 ++++++++++++++++++++
>> 4 files changed, 481 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt
>> create mode 100644 drivers/cpufreq/exynos5440-cpufreq.c
>>
>> diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt
>> new file mode 100644
>> index 0000000..96cb0ed
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt
>> @@ -0,0 +1,24 @@
>> +
>> +Exynos5440 cpufreq driver
>> +-------------------
>> +
>> +Exynos5440 SoC cpufreq driver for CPU frequency scaling.
>> +
>> +Required properties:
>> +- interrupts: Interrupt to know the completion of cpu frequency change.
>> +- cpufreq_tbl: Table of frequencies and voltage CPU could be transitioned into,
>
> This has to be "operating-points" as in cpufreq-cpu0 driver.
Yes I will check if opp table is beneficial. In my case it is just one
time parsing of cpufreq table and those values(freq, volt) are not
used later so did not use opp libraries.
>
>> + in the decreasing order. Frequency should be in KHZ units and voltage
>> + should be in microvolts.
>> +
>> +All the required listed above must be defined under node cpufreq.
>> +
>> +Example:
>> +--------
>> + cpufreq at 160000 {
>> + compatible = "samsung,exynos5440-cpufreq";
>> + reg = <0x160000 0x1000>;
>> + interrupts = <0 57 0>;
>> + cpufreq_tbl = < 1200000 1025000
>> + 1000000 975000
>> + 800000 925000 >;
>> + };
>
>> diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
>> new file mode 100644
>> index 0000000..41d39e2
>> --- /dev/null
>> +++ b/drivers/cpufreq/exynos5440-cpufreq.c
>> @@ -0,0 +1,448 @@
>> +/*
>> + * Copyright (c) 2013 Samsung Electronics Co., Ltd.
>> + * http://www.samsung.com
>> + *
>> + * Amit Daniel Kachhap <amit.daniel at samsung.com>
>> + *
>> + * EXYNOS5440 - CPU frequency scaling support
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> +*/
>> +
>> +#include <linux/clk.h>
>> +#include <linux/cpufreq.h>
>> +#include <linux/err.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/slab.h>
>> +
>> +/*Register definations*/
>> +#define XMU_DVFS_CTRL 0x0060
>> +#define XMU_PMU_P0_7 0x0064
>> +#define XMU_C0_3_PSTATE 0x0090
>> +#define XMU_P_LIMIT 0x00A0
>> +#define XMU_P_STATUS 0x00A4
>> +#define XMU_PMUEVTEN 0x00D0
>> +#define XMU_PMUIRQEN 0x00D4
>> +#define XMU_PMUIRQ 0x00D8
>> +
>> +/*PMU mask and shift definations*/
>> +#define P_VALUE_MASK 0x7
>> +
>> +#define XMU_DVFS_CTRL_EN_SHIFT 0
>> +
>> +#define P0_7_CPUCLKDEV_SHIFT 21
>> +#define P0_7_CPUCLKDEV_MASK 0x7
>> +#define P0_7_ATBCLKDEV_SHIFT 18
>> +#define P0_7_ATBCLKDEV_MASK 0x7
>> +#define P0_7_CSCLKDEV_SHIFT 15
>> +#define P0_7_CSCLKDEV_MASK 0x7
>> +#define P0_7_CPUEMA_SHIFT 28
>> +#define P0_7_CPUEMA_MASK 0xf
>> +#define P0_7_L2EMA_SHIFT 24
>> +#define P0_7_L2EMA_MASK 0xf
>> +#define P0_7_VDD_SHIFT 8
>> +#define P0_7_VDD_MASK 0x7f
>> +#define P0_7_FREQ_SHIFT 0
>> +#define P0_7_FREQ_MASK 0xff
>> +
>> +#define C0_3_PSTATE_VALID_SHIFT 8
>> +#define C0_3_PSTATE_CURR_SHIFT 4
>> +#define C0_3_PSTATE_NEW_SHIFT 0
>> +
>> +#define PSTATE_CHANGED_EVTEN_SHIFT 0
>> +
>> +#define PSTATE_CHANGED_IRQEN_SHIFT 0
>> +
>> +#define PSTATE_CHANGED_SHIFT 0
>> +
>> +/*some constant values for clock divider calculation*/
>> +#define CPU_DIV_FREQ_MAX 500
>> +#define CPU_DBG_FREQ_MAX 375
>> +#define CPU_ATB_FREQ_MAX 500
>> +
>> +#define PMIC_LOW_VOLT 0x30
>> +#define PMIC_HIGH_VOLT 0x28
>> +
>> +#define CPUEMA_HIGH 0x2
>> +#define CPUEMA_MID 0x4
>> +#define CPUEMA_LOW 0x7
>> +
>> +#define L2EMA_HIGH 0x1
>> +#define L2EMA_MID 0x3
>> +#define L2EMA_LOW 0x4
>> +
>> +#define DIV_TAB_MAX 2
>> +/*frequency unit is 20MHZ*/
>> +#define FREQ_UNIT 20
>> +#define MAX_VOLTAGE 1550000 /*In micro volt*/
>> +#define VOLTAGE_STEP 12500 /*In micro volt*/
>> +
>> +#define DRIVER_NAME "exynos5440_dvfs"
>> +#define DEF_TRANS_LATENCY 100000
>> +
>> +enum cpufreq_level_index {
>> + L0, L1, L2, L3, L4,
>> + L5, L6, L7, L8, L9,
>> +};
>> +#define CPUFREQ_LEVEL_END (L7 + 1)
>> +
>> +struct exynos_dvfs_data {
>> + void __iomem *base;
>> + struct resource *mem;
>> + int irq;
>> + struct clk *cpu_clk;
>> + unsigned int cur_frequency;
>> + bool dvfs_init;
>> + struct cpufreq_frequency_table *freq_table;
>> + struct work_struct irq_work;
>> +};
>> +
>> +static struct exynos_dvfs_data *dvfs_info;
>> +static DEFINE_MUTEX(cpufreq_lock);
>> +static struct cpufreq_freqs freqs;
>> +static struct cpufreq_frequency_table exynos_freq_table[CPUFREQ_LEVEL_END + 1];
>> +static unsigned int exynos_volt_table[CPUFREQ_LEVEL_END + 1];
>> +
>> +static void init_div_table(void)
>> +{
>> + struct cpufreq_frequency_table *freq_tbl = exynos_freq_table;
>> + unsigned int *volt_tbl = exynos_volt_table;
>> + unsigned int tmp, clk_div, ema_div, freq, volt_id;
>> + int i = 0;
>> +
>> + for (i = 0; freq_tbl[i].frequency != CPUFREQ_TABLE_END; i++) {
>> +
>> + freq = freq_tbl[i].frequency / 1000; /*In MHZ*/
>> + clk_div = ((freq / CPU_DIV_FREQ_MAX) & P0_7_CPUCLKDEV_MASK)
>> + << P0_7_CPUCLKDEV_SHIFT;
>> + clk_div |= ((freq / CPU_ATB_FREQ_MAX) & P0_7_ATBCLKDEV_MASK)
>> + << P0_7_ATBCLKDEV_SHIFT;
>> + clk_div |= ((freq / CPU_DBG_FREQ_MAX) & P0_7_CSCLKDEV_MASK)
>> + << P0_7_CSCLKDEV_SHIFT;
>> +
>> + /*Calculate EMA*/
>> + volt_id = (MAX_VOLTAGE - volt_tbl[i]) / VOLTAGE_STEP;
>> + if (volt_id < PMIC_HIGH_VOLT) {
>> + ema_div = (CPUEMA_HIGH << P0_7_CPUEMA_SHIFT) |
>> + (L2EMA_HIGH << P0_7_L2EMA_SHIFT);
>> + } else if (volt_id > PMIC_LOW_VOLT) {
>> + ema_div = (CPUEMA_LOW << P0_7_CPUEMA_SHIFT) |
>> + (L2EMA_LOW << P0_7_L2EMA_SHIFT);
>> + } else {
>> + ema_div = (CPUEMA_MID << P0_7_CPUEMA_SHIFT) |
>> + (L2EMA_MID << P0_7_L2EMA_SHIFT);
>> + }
>> +
>> + tmp = (clk_div | ema_div | (volt_id << P0_7_VDD_SHIFT)
>> + | ((freq / FREQ_UNIT) << P0_7_FREQ_SHIFT));
>> +
>> + __raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 * i);
>> + }
>> +}
>> +
>> +void exynos_enable_dvfs(void)
>> +{
>> + unsigned int tmp, i, cpu;
>> + struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
>> + /*Disable DVFS*/
>> + __raw_writel(0, dvfs_info->base + XMU_DVFS_CTRL);
>> +
>> + /*Enable PSTATE Change Event*/
>> + tmp = __raw_readl(dvfs_info->base + XMU_PMUEVTEN);
>> + tmp |= (1 << PSTATE_CHANGED_EVTEN_SHIFT);
>> + __raw_writel(tmp, dvfs_info->base + XMU_PMUEVTEN);
>> +
>> + /*Enable PSTATE Change IRQ*/
>> + tmp = __raw_readl(dvfs_info->base + XMU_PMUIRQEN);
>> + tmp |= (1 << PSTATE_CHANGED_IRQEN_SHIFT);
>> + __raw_writel(tmp, dvfs_info->base + XMU_PMUIRQEN);
>> +
>> + /*Set initial perfromance index*/
>
> performance.
yes
>
>> + for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++)
>> + if (freq_table[i].frequency == dvfs_info->cur_frequency)
>> + break;
>> +
>> + if (freq_table[i].frequency == CPUFREQ_TABLE_END) {
>> + pr_crit("Boot up frequency not supported\n");
>> + if (i) {
>> + /*Assign the highest frequency*/
>> + i = 0;
>> + dvfs_info->cur_frequency = freq_table[i].frequency;
>> + } else {
>> + return;
>> + }
>> + }
>> + pr_info("Setting dvfs initial frequency = %u",
>> + dvfs_info->cur_frequency);
>> +
>> + for (cpu = 0; cpu < CONFIG_NR_CPUS; cpu++) {
>> + tmp = __raw_readl(dvfs_info->base + XMU_C0_3_PSTATE + cpu * 4);
>> + tmp &= ~(P_VALUE_MASK << C0_3_PSTATE_NEW_SHIFT);
>> + tmp |= (i << C0_3_PSTATE_NEW_SHIFT);
>> + __raw_writel(tmp, dvfs_info->base + XMU_C0_3_PSTATE + cpu * 4);
>> + }
>> +
>> + /*Enable DVFS*/
>> + __raw_writel(1 << XMU_DVFS_CTRL_EN_SHIFT,
>> + dvfs_info->base + XMU_DVFS_CTRL);
>> +}
>> +
>> +static int exynos_verify_speed(struct cpufreq_policy *policy)
>> +{
>> + return cpufreq_frequency_table_verify(policy,
>> + dvfs_info->freq_table);
>> +}
>> +
>> +static unsigned int exynos_getspeed(unsigned int cpu)
>> +{
>> + return dvfs_info->cur_frequency;
>> +}
>> +
>> +static int exynos_target(struct cpufreq_policy *policy,
>> + unsigned int target_freq,
>> + unsigned int relation)
>> +{
>> + unsigned int index, old_index, tmp;
>> + int ret = 0, i;
>> + struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
>> +
>> + mutex_lock(&cpufreq_lock);
>> +
>> + freqs.old = dvfs_info->cur_frequency;
>> +
>> + if (dvfs_info->dvfs_init == false) {
>> + ret = -EAGAIN;
>> + goto out;
>> + }
>> +
>> + /*
>> + * The policy max have been changed so that we cannot get proper
>> + * old_index with cpufreq_frequency_table_target(). Thus, ignore
>> + * policy and get the index from the raw freqeuncy table.
>> + */
>
> What? Why ?
Invalid comment, ignore it.
>
>> + for (old_index = 0;
>> + freq_table[old_index].frequency != CPUFREQ_TABLE_END;
>> + old_index++)
>> + if (freq_table[old_index].frequency == freqs.old)
>> + break;
>> +
>> + if (freq_table[old_index].frequency == CPUFREQ_TABLE_END) {
>
> How can this be true?
This is error scenario
>
>> + ret = -EINVAL;
>> + goto out;
>> + }
>> +
>> + if (cpufreq_frequency_table_target(policy, freq_table,
>> + target_freq, relation, &index)) {
>> + ret = -EINVAL;
>> + goto out;
>> + }
>> +
>> + freqs.new = freq_table[index].frequency;
>> + freqs.cpu = policy->cpu;
>> +
>> + for_each_cpu(freqs.cpu, policy->cpus)
>> + cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
>> +
>> + /*Set the target frequency in all C0_3_PSTATE register*/
>> + for_each_cpu(i, policy->cpus) {
>> + tmp = __raw_readl(dvfs_info->base + XMU_C0_3_PSTATE + i * 4);
>> + tmp &= ~(P_VALUE_MASK << C0_3_PSTATE_NEW_SHIFT);
>> + tmp |= (index << C0_3_PSTATE_NEW_SHIFT);
>> +
>> + __raw_writel(tmp, dvfs_info->base + XMU_C0_3_PSTATE + i * 4);
>> + }
>> +out:
>> + mutex_unlock(&cpufreq_lock);
>
> That's something new and interesting. So you are just configuring your
> controller
> for a new dvfs point and get back to work. Then you would get an
> interrupt sometime
> and work is queued and everybody notified.
>
> @Rafael: You expect any issue with this technique ?
>
Yes you understood it correctly. So in this method prechange and
postchange notifiers are called in a separate context. I guess it
should be fine.
>> + return ret;
>> +}
>> +
>> +static void exynos_cpufreq_work(struct work_struct *work)
>> +{
>> + unsigned int cur_pstate, index;
>> + struct cpufreq_policy *policy = cpufreq_cpu_get(0); /* boot CPU */
>> + struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
>> +
>> + mutex_lock(&cpufreq_lock);
>> +
>> + freqs.old = dvfs_info->cur_frequency;
>> +
>> + cur_pstate = __raw_readl(dvfs_info->base + XMU_P_STATUS);
>> + if (cur_pstate >> C0_3_PSTATE_VALID_SHIFT & 0x1)
>> + index = (cur_pstate >> C0_3_PSTATE_CURR_SHIFT) & P_VALUE_MASK;
>> + else
>> + index = (cur_pstate >> C0_3_PSTATE_NEW_SHIFT) & P_VALUE_MASK;
>> +
>> + if (index < CPUFREQ_LEVEL_END)
>> + freqs.new = freq_table[index].frequency;
>> +
>> + for_each_cpu(freqs.cpu, policy->cpus)
>> + cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
>> +
>> + dvfs_info->cur_frequency = freqs.new;
>> +
>> + cpufreq_cpu_put(policy);
>> + mutex_unlock(&cpufreq_lock);
>> + enable_irq(dvfs_info->irq);
>> +}
>> +
>> +static irqreturn_t exynos_cpufreq_irq(int irq, void *id)
>> +{
>> + unsigned int tmp;
>> +
>> + tmp = __raw_readl(dvfs_info->base + XMU_PMUIRQ);
>> + if (tmp >> PSTATE_CHANGED_SHIFT & 0x1) {
>> + __raw_writel(tmp, dvfs_info->base + XMU_PMUIRQ);
>> +
>> + if (dvfs_info->dvfs_init == true) {
>> + disable_irq_nosync(irq);
>> + schedule_work(&dvfs_info->irq_work);
>> + }
>> + }
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
>> +{
>> + policy->cur = policy->min = policy->max = dvfs_info->cur_frequency;
>
> you don't have to fill min and max. its done by core when you call
> cpufreq_frequency_table_cpuinfo().
Ok.
>
>> +
>> + cpufreq_frequency_table_get_attr(dvfs_info->freq_table, policy->cpu);
>> +
>> + /* set the transition latency value */
>> + policy->cpuinfo.transition_latency = DEF_TRANS_LATENCY;
>> +
>> + /*
>> + * EXYNOS5440 multi-core processors has 4 cores
>> + * that the frequency cannot be set independently.
>> + * Each cpu is bound to the same speed.
>> + * So the affected cpu is all of the cpus.
>> + */
>
> Good. I understood it now :)
>
>> + if (num_online_cpus() == 1) {
>> + cpumask_copy(policy->related_cpus, cpu_possible_mask);
>> + cpumask_copy(policy->cpus, cpu_online_mask);
>> + } else {
>> + policy->shared_type = CPUFREQ_SHARED_TYPE_ANY;
>> + cpumask_setall(policy->cpus);
>> + }
>
> Replace everything between "Good" and this line with:
>
> cpumask_setall(policy->cpus);
>
> http://www.spinics.net/lists/cpufreq/msg04091.html
Right. good suggestion
>
>> + return cpufreq_frequency_table_cpuinfo(policy, dvfs_info->freq_table);
>> +}
>> +
>> +static struct cpufreq_driver exynos_driver = {
>> + .flags = CPUFREQ_STICKY,
>> + .verify = exynos_verify_speed,
>> + .target = exynos_target,
>> + .get = exynos_getspeed,
>> + .init = exynos_cpufreq_cpu_init,
>> + .name = DRIVER_NAME,
>> +};
>> +
>> +static int __init exynos_cpufreq_init(void)
>> +{
>> + int ret = -EINVAL, len, i;
>> + struct device_node *np;
>> + struct cpufreq_frequency_table *freq_tbl = exynos_freq_table;
>> + unsigned int *volt_tbl = exynos_volt_table;
>
> why do we need duplicate names for global variables here? remove exynos_
> from globals and that would be enough (in case you don't want long names).
Ok
>
>> + const struct property *prop;
>> + const __be32 *val;
>> +
>> + np = of_find_compatible_node(NULL, NULL, "samsung,exynos5440-cpufreq");
>> + if (!np)
>> + return -ENODEV;
>> +
>> + dvfs_info = kzalloc(sizeof(struct exynos_dvfs_data), GFP_KERNEL);
>
> sizeof(*dvfs_info) ?? why don't make it static too, as you have other
> stuff too.. ?
> The better option for single image solution to allocate everything
> dynamically, so that
> unused drivers don't occupy any space.
>
>> + if (!dvfs_info) {
>> + of_node_put(np);
>> + return -ENOMEM;
>> + }
>> +
>> + dvfs_info->base = of_iomap(np, 0);
>> + if (!dvfs_info->base) {
>> + pr_err("No cpufreq memory map found\n");
>> + ret = -ENODEV;
>> + goto err_map;
>> +
>> + }
>> +
>> + dvfs_info->irq = irq_of_parse_and_map(np, 0);
>> +
>> + if (dvfs_info->irq == 0) {
>> + pr_err("No cpufreq irq found\n");
>> + ret = -ENODEV;
>> + goto err_irq_parse;
>> + }
>> +
>> + prop = of_find_property(np, "cpufreq_tbl", NULL);
>> + if (!prop || !prop->value) {
>> + pr_err("No cpufreq table found\n");
>> + ret = -ENODEV;
>> + goto err_irq_parse;
>> + }
>> +
>> + len = prop->length / sizeof(u32);
>> + val = prop->value;
>> +
>> + if ((len == 0) || (len / 2 > CPUFREQ_LEVEL_END)) {
>
> I really didn't like this limit you have put at the number of dvfs
> points. Better
> would be to use:
>
> ret = of_init_opp_table(cpu_dev);
> if (ret) {
> pr_err("failed to init OPP table: %d\n", ret);
> goto out_put_node;
> }
>
> ret = opp_init_cpufreq_table(cpu_dev, &freq_table);
> if (ret) {
> pr_err("failed to init cpufreq table: %d\n", ret);
> goto out_put_node;
> }
>
> as used in cpufreq-cpu0 driver. Also please have a closer look at this driver,
> you may not your driver at all :)
Yes I thought of this but there are some different things needed in
this driver like
*) prechange and postchange out of context call.
*) some controller initialisations after parsing the cpufreq table.
*) no explicit set voltage call
>
>> + pr_err("Invalid cpufreq table\n");
>> + ret = -ENODEV;
>> + goto err_irq_parse;
>> + }
>> +
>> + for (i = 0; i < (len / 2); i++) {
>> + freq_tbl[i].index = i;
>> + freq_tbl[i].frequency = be32_to_cpup(val++);
>> + volt_tbl[i] = be32_to_cpup(val++);
>> + }
>> +
>> + freq_tbl[i].index = i;
>> + freq_tbl[i].frequency = CPUFREQ_TABLE_END;
>> +
>> + dvfs_info->freq_table = freq_tbl;
>> +
>> + dvfs_info->cpu_clk = clk_get(NULL, "armclk");
>
> devm_clk_get() ?
Ok
>
>> + if (IS_ERR(dvfs_info->cpu_clk)) {
>> + pr_err("Failed to get cpu clock\n");
>> + ret = PTR_ERR(dvfs_info->cpu_clk);
>> + goto err_irq_parse;
>> + }
>> +
>> + INIT_WORK(&dvfs_info->irq_work, exynos_cpufreq_work);
>> + if (request_irq(dvfs_info->irq, exynos_cpufreq_irq,
>
> devm_ ??
Ok.
>
>> + IRQF_TRIGGER_NONE, DRIVER_NAME, dvfs_info)) {
>> + pr_err("Failed to register IRQ\n");
>> + ret = -ENODEV;
>> + goto err_irq_req;
>> + }
>> +
>> + dvfs_info->cur_frequency = clk_get_rate(dvfs_info->cpu_clk) / 1000;
>
> what if clk_get_rate fails ? or returns zero.
Ok.
>
>> + init_div_table();
>> + exynos_enable_dvfs();
>> +
>> + if (cpufreq_register_driver(&exynos_driver)) {
>> + pr_err("%s: failed to register cpufreq driver\n", __func__);
>> + goto err_register;
>> + }
>> +
>> + of_node_put(np);
>> + dvfs_info->dvfs_init = true;
>
> why do you need this ?
This is added to synchronize the interrupts.
Thanks,
Amit Daniel
>
>> + pr_info("exynos5440 DVFS initialised.\n");
>> +
>> + return 0;
>> +
>> +err_register:
>> + free_irq(dvfs_info->irq, dvfs_info);
>> +err_irq_req:
>> + clk_put(dvfs_info->cpu_clk);
>> +err_irq_parse:
>> + iounmap(dvfs_info->base);
>> +err_map:
>> + of_node_put(np);
>> + kfree(dvfs_info);
>> + pr_err("%s: failed initialization\n", __func__);
>> + return -EINVAL;
>> +}
>> +late_initcall(exynos_cpufreq_init);
>> --
>> 1.7.10.4
>>
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