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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-07-08 11:00:02 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-07-08 11:00:02 +0200
commit586a07dca8c51b966960d1f0d8be9c27d7e0a95c (patch)
treeef32cb11c5bddfc122a5c443ff5b2ca16bc6942d /drivers/cpufreq
parent13b06b78c772d64e2207e4a5a5329856fe2bf241 (diff)
parent70a59fde6e69d1d8579f84bf4555bfffb3ce452d (diff)
downloadlinux-586a07dca8c51b966960d1f0d8be9c27d7e0a95c.tar.bz2
Merge branch 'pm-cpufreq'
* pm-cpufreq: cpufreq: Avoid calling cpufreq_verify_current_freq() from handle_update() cpufreq: Consolidate cpufreq_update_current_freq() and __cpufreq_get() cpufreq: Don't skip frequency validation for has_target() drivers cpufreq: Use has_target() instead of !setpolicy cpufreq: Remove redundant !setpolicy check cpufreq: Move the IS_ENABLED(CPU_THERMAL) macro into a stub cpufreq: s5pv210: Don't flood kernel log after cpufreq change cpufreq: pcc-cpufreq: Fail initialization if driver cannot be registered cpufreq: add driver for Raspberry Pi cpufreq: Switch imx7d to imx-cpufreq-dt for speed grading cpufreq: imx-cpufreq-dt: Remove global platform match list cpufreq: brcmstb-avs-cpufreq: Fix types for voltage/frequency cpufreq: brcmstb-avs-cpufreq: Fix initial command check cpufreq: armada-37xx: Remove set but not used variable 'freq' cpufreq: imx-cpufreq-dt: Fix no OPPs available on unfused parts dt-bindings: imx-cpufreq-dt: Document opp-supported-hw usage cpufreq: Add imx-cpufreq-dt driver
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/Kconfig.arm17
-rw-r--r--drivers/cpufreq/Makefile2
-rw-r--r--drivers/cpufreq/armada-37xx-cpufreq.c4
-rw-r--r--drivers/cpufreq/brcmstb-avs-cpufreq.c12
-rw-r--r--drivers/cpufreq/cpufreq-dt-platdev.c5
-rw-r--r--drivers/cpufreq/cpufreq.c121
-rw-r--r--drivers/cpufreq/imx-cpufreq-dt.c97
-rw-r--r--drivers/cpufreq/pcc-cpufreq.c4
-rw-r--r--drivers/cpufreq/raspberrypi-cpufreq.c97
-rw-r--r--drivers/cpufreq/s5pv210-cpufreq.c2
10 files changed, 281 insertions, 80 deletions
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index f8129edc145e..56c31a78c692 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -93,6 +93,15 @@ config ARM_IMX6Q_CPUFREQ
If in doubt, say N.
+config ARM_IMX_CPUFREQ_DT
+ tristate "Freescale i.MX8M cpufreq support"
+ depends on ARCH_MXC && CPUFREQ_DT
+ help
+ This adds cpufreq driver support for Freescale i.MX8M series SoCs,
+ based on cpufreq-dt.
+
+ If in doubt, say N.
+
config ARM_KIRKWOOD_CPUFREQ
def_bool MACH_KIRKWOOD
help
@@ -133,6 +142,14 @@ config ARM_QCOM_CPUFREQ_HW
The driver implements the cpufreq interface for this HW engine.
Say Y if you want to support CPUFreq HW.
+config ARM_RASPBERRYPI_CPUFREQ
+ tristate "Raspberry Pi cpufreq support"
+ depends on CLK_RASPBERRYPI || COMPILE_TEST
+ help
+ This adds the CPUFreq driver for Raspberry Pi
+
+ If in doubt, say N.
+
config ARM_S3C_CPUFREQ
bool
help
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 689b26c6f949..5a6c70d26c98 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_ACPI_CPPC_CPUFREQ) += cppc_cpufreq.o
obj-$(CONFIG_ARCH_DAVINCI) += davinci-cpufreq.o
obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ) += highbank-cpufreq.o
obj-$(CONFIG_ARM_IMX6Q_CPUFREQ) += imx6q-cpufreq.o
+obj-$(CONFIG_ARM_IMX_CPUFREQ_DT) += imx-cpufreq-dt.o
obj-$(CONFIG_ARM_KIRKWOOD_CPUFREQ) += kirkwood-cpufreq.o
obj-$(CONFIG_ARM_MEDIATEK_CPUFREQ) += mediatek-cpufreq.o
obj-$(CONFIG_MACH_MVEBU_V7) += mvebu-cpufreq.o
@@ -64,6 +65,7 @@ obj-$(CONFIG_ARM_PXA2xx_CPUFREQ) += pxa2xx-cpufreq.o
obj-$(CONFIG_PXA3xx) += pxa3xx-cpufreq.o
obj-$(CONFIG_ARM_QCOM_CPUFREQ_HW) += qcom-cpufreq-hw.o
obj-$(CONFIG_ARM_QCOM_CPUFREQ_KRYO) += qcom-cpufreq-kryo.o
+obj-$(CONFIG_ARM_RASPBERRYPI_CPUFREQ) += raspberrypi-cpufreq.o
obj-$(CONFIG_ARM_S3C2410_CPUFREQ) += s3c2410-cpufreq.o
obj-$(CONFIG_ARM_S3C2412_CPUFREQ) += s3c2412-cpufreq.o
obj-$(CONFIG_ARM_S3C2416_CPUFREQ) += s3c2416-cpufreq.o
diff --git a/drivers/cpufreq/armada-37xx-cpufreq.c b/drivers/cpufreq/armada-37xx-cpufreq.c
index 0df16eb1eb3c..aa0f06dec959 100644
--- a/drivers/cpufreq/armada-37xx-cpufreq.c
+++ b/drivers/cpufreq/armada-37xx-cpufreq.c
@@ -257,7 +257,7 @@ static void __init armada37xx_cpufreq_avs_configure(struct regmap *base,
static void __init armada37xx_cpufreq_avs_setup(struct regmap *base,
struct armada_37xx_dvfs *dvfs)
{
- unsigned int avs_val = 0, freq;
+ unsigned int avs_val = 0;
int load_level = 0;
if (base == NULL)
@@ -275,8 +275,6 @@ static void __init armada37xx_cpufreq_avs_setup(struct regmap *base,
for (load_level = 1; load_level < LOAD_LEVEL_NR; load_level++) {
- freq = dvfs->cpu_freq_max / dvfs->divider[load_level];
-
avs_val = dvfs->avs[load_level];
regmap_update_bits(base, ARMADA_37XX_AVS_VSET(load_level-1),
ARMADA_37XX_AVS_VDD_MASK << ARMADA_37XX_AVS_HIGH_VDD_LIMIT |
diff --git a/drivers/cpufreq/brcmstb-avs-cpufreq.c b/drivers/cpufreq/brcmstb-avs-cpufreq.c
index e6f9cbe5835f..77b0e5d0fb13 100644
--- a/drivers/cpufreq/brcmstb-avs-cpufreq.c
+++ b/drivers/cpufreq/brcmstb-avs-cpufreq.c
@@ -384,12 +384,12 @@ static int brcm_avs_set_pstate(struct private_data *priv, unsigned int pstate)
return __issue_avs_command(priv, AVS_CMD_SET_PSTATE, true, args);
}
-static unsigned long brcm_avs_get_voltage(void __iomem *base)
+static u32 brcm_avs_get_voltage(void __iomem *base)
{
return readl(base + AVS_MBOX_VOLTAGE1);
}
-static unsigned long brcm_avs_get_frequency(void __iomem *base)
+static u32 brcm_avs_get_frequency(void __iomem *base)
{
return readl(base + AVS_MBOX_FREQUENCY) * 1000; /* in kHz */
}
@@ -446,8 +446,8 @@ static bool brcm_avs_is_firmware_loaded(struct private_data *priv)
rc = brcm_avs_get_pmap(priv, NULL);
magic = readl(priv->base + AVS_MBOX_MAGIC);
- return (magic == AVS_FIRMWARE_MAGIC) && (rc != -ENOTSUPP) &&
- (rc != -EINVAL);
+ return (magic == AVS_FIRMWARE_MAGIC) && ((rc != -ENOTSUPP) ||
+ (rc != -EINVAL));
}
static unsigned int brcm_avs_cpufreq_get(unsigned int cpu)
@@ -653,14 +653,14 @@ static ssize_t show_brcm_avs_voltage(struct cpufreq_policy *policy, char *buf)
{
struct private_data *priv = policy->driver_data;
- return sprintf(buf, "0x%08lx\n", brcm_avs_get_voltage(priv->base));
+ return sprintf(buf, "0x%08x\n", brcm_avs_get_voltage(priv->base));
}
static ssize_t show_brcm_avs_frequency(struct cpufreq_policy *policy, char *buf)
{
struct private_data *priv = policy->driver_data;
- return sprintf(buf, "0x%08lx\n", brcm_avs_get_frequency(priv->base));
+ return sprintf(buf, "0x%08x\n", brcm_avs_get_frequency(priv->base));
}
cpufreq_freq_attr_ro(brcm_avs_pstate);
diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
index 88e00683eaeb..03dc4244ab00 100644
--- a/drivers/cpufreq/cpufreq-dt-platdev.c
+++ b/drivers/cpufreq/cpufreq-dt-platdev.c
@@ -37,7 +37,6 @@ static const struct of_device_id whitelist[] __initconst = {
{ .compatible = "fsl,imx27", },
{ .compatible = "fsl,imx51", },
{ .compatible = "fsl,imx53", },
- { .compatible = "fsl,imx7d", },
{ .compatible = "marvell,berlin", },
{ .compatible = "marvell,pxa250", },
@@ -105,6 +104,10 @@ static const struct of_device_id blacklist[] __initconst = {
{ .compatible = "calxeda,highbank", },
{ .compatible = "calxeda,ecx-2000", },
+ { .compatible = "fsl,imx7d", },
+ { .compatible = "fsl,imx8mq", },
+ { .compatible = "fsl,imx8mm", },
+
{ .compatible = "marvell,armadaxp", },
{ .compatible = "mediatek,mt2701", },
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index e84bf0eb7239..0a9f675f2af4 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -356,12 +356,10 @@ static void cpufreq_notify_transition(struct cpufreq_policy *policy,
* which is not equal to what the cpufreq core thinks is
* "old frequency".
*/
- if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
- if (policy->cur && (policy->cur != freqs->old)) {
- pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n",
- freqs->old, policy->cur);
- freqs->old = policy->cur;
- }
+ if (policy->cur && policy->cur != freqs->old) {
+ pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n",
+ freqs->old, policy->cur);
+ freqs->old = policy->cur;
}
srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
@@ -631,7 +629,7 @@ static int cpufreq_parse_policy(char *str_governor,
}
/**
- * cpufreq_parse_governor - parse a governor string only for !setpolicy
+ * cpufreq_parse_governor - parse a governor string only for has_target()
*/
static int cpufreq_parse_governor(char *str_governor,
struct cpufreq_policy *policy)
@@ -1114,13 +1112,25 @@ static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cp
return ret;
}
+static void refresh_frequency_limits(struct cpufreq_policy *policy)
+{
+ struct cpufreq_policy new_policy = *policy;
+
+ pr_debug("updating policy for CPU %u\n", policy->cpu);
+
+ new_policy.min = policy->user_policy.min;
+ new_policy.max = policy->user_policy.max;
+
+ cpufreq_set_policy(policy, &new_policy);
+}
+
static void handle_update(struct work_struct *work)
{
struct cpufreq_policy *policy =
container_of(work, struct cpufreq_policy, update);
- unsigned int cpu = policy->cpu;
- pr_debug("handle_update for cpu %u called\n", cpu);
- cpufreq_update_policy(cpu);
+
+ pr_debug("handle_update for cpu %u called\n", policy->cpu);
+ refresh_frequency_limits(policy);
}
static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
@@ -1300,7 +1310,7 @@ static int cpufreq_online(unsigned int cpu)
policy->max = policy->user_policy.max;
}
- if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
+ if (cpufreq_driver->get && has_target()) {
policy->cur = cpufreq_driver->get(policy->cpu);
if (!policy->cur) {
pr_err("%s: ->get() failed\n", __func__);
@@ -1375,8 +1385,7 @@ static int cpufreq_online(unsigned int cpu)
if (cpufreq_driver->ready)
cpufreq_driver->ready(policy);
- if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
- cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV)
+ if (cpufreq_thermal_control_enabled(cpufreq_driver))
policy->cdev = of_cpufreq_cooling_register(policy);
pr_debug("initialization complete\n");
@@ -1466,8 +1475,7 @@ static int cpufreq_offline(unsigned int cpu)
goto unlock;
}
- if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
- cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV) {
+ if (cpufreq_thermal_control_enabled(cpufreq_driver)) {
cpufreq_cooling_unregister(policy->cdev);
policy->cdev = NULL;
}
@@ -1546,6 +1554,30 @@ static void cpufreq_out_of_sync(struct cpufreq_policy *policy,
cpufreq_freq_transition_end(policy, &freqs, 0);
}
+static unsigned int cpufreq_verify_current_freq(struct cpufreq_policy *policy, bool update)
+{
+ unsigned int new_freq;
+
+ new_freq = cpufreq_driver->get(policy->cpu);
+ if (!new_freq)
+ return 0;
+
+ /*
+ * If fast frequency switching is used with the given policy, the check
+ * against policy->cur is pointless, so skip it in that case.
+ */
+ if (policy->fast_switch_enabled || !has_target())
+ return new_freq;
+
+ if (policy->cur != new_freq) {
+ cpufreq_out_of_sync(policy, new_freq);
+ if (update)
+ schedule_work(&policy->update);
+ }
+
+ return new_freq;
+}
+
/**
* cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur
* @cpu: CPU number
@@ -1601,31 +1633,10 @@ EXPORT_SYMBOL(cpufreq_quick_get_max);
static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
{
- unsigned int ret_freq = 0;
-
if (unlikely(policy_is_inactive(policy)))
- return ret_freq;
-
- ret_freq = cpufreq_driver->get(policy->cpu);
-
- /*
- * If fast frequency switching is used with the given policy, the check
- * against policy->cur is pointless, so skip it in that case too.
- */
- if (policy->fast_switch_enabled)
- return ret_freq;
-
- if (ret_freq && policy->cur &&
- !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
- /* verify no discrepancy between actual and
- saved value exists */
- if (unlikely(ret_freq != policy->cur)) {
- cpufreq_out_of_sync(policy, ret_freq);
- schedule_work(&policy->update);
- }
- }
+ return 0;
- return ret_freq;
+ return cpufreq_verify_current_freq(policy, true);
}
/**
@@ -1652,24 +1663,6 @@ unsigned int cpufreq_get(unsigned int cpu)
}
EXPORT_SYMBOL(cpufreq_get);
-static unsigned int cpufreq_update_current_freq(struct cpufreq_policy *policy)
-{
- unsigned int new_freq;
-
- new_freq = cpufreq_driver->get(policy->cpu);
- if (!new_freq)
- return 0;
-
- if (!policy->cur) {
- pr_debug("cpufreq: Driver did not initialize current freq\n");
- policy->cur = new_freq;
- } else if (policy->cur != new_freq && has_target()) {
- cpufreq_out_of_sync(policy, new_freq);
- }
-
- return new_freq;
-}
-
static struct subsys_interface cpufreq_interface = {
.name = "cpufreq",
.subsys = &cpu_subsys,
@@ -2150,8 +2143,8 @@ static int cpufreq_start_governor(struct cpufreq_policy *policy)
pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
- if (cpufreq_driver->get && !cpufreq_driver->setpolicy)
- cpufreq_update_current_freq(policy);
+ if (cpufreq_driver->get)
+ cpufreq_verify_current_freq(policy, false);
if (policy->governor->start) {
ret = policy->governor->start(policy);
@@ -2392,7 +2385,6 @@ int cpufreq_set_policy(struct cpufreq_policy *policy,
void cpufreq_update_policy(unsigned int cpu)
{
struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
- struct cpufreq_policy new_policy;
if (!policy)
return;
@@ -2401,16 +2393,11 @@ void cpufreq_update_policy(unsigned int cpu)
* BIOS might change freq behind our back
* -> ask driver for current freq and notify governors about a change
*/
- if (cpufreq_driver->get && !cpufreq_driver->setpolicy &&
- (cpufreq_suspended || WARN_ON(!cpufreq_update_current_freq(policy))))
+ if (cpufreq_driver->get && has_target() &&
+ (cpufreq_suspended || WARN_ON(!cpufreq_verify_current_freq(policy, false))))
goto unlock;
- pr_debug("updating policy for CPU %u\n", cpu);
- memcpy(&new_policy, policy, sizeof(*policy));
- new_policy.min = policy->user_policy.min;
- new_policy.max = policy->user_policy.max;
-
- cpufreq_set_policy(policy, &new_policy);
+ refresh_frequency_limits(policy);
unlock:
cpufreq_cpu_release(policy);
diff --git a/drivers/cpufreq/imx-cpufreq-dt.c b/drivers/cpufreq/imx-cpufreq-dt.c
new file mode 100644
index 000000000000..b54fd26ea7df
--- /dev/null
+++ b/drivers/cpufreq/imx-cpufreq-dt.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP
+ */
+
+#include <linux/cpu.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/slab.h>
+
+#define OCOTP_CFG3_SPEED_GRADE_SHIFT 8
+#define OCOTP_CFG3_SPEED_GRADE_MASK (0x3 << 8)
+#define OCOTP_CFG3_MKT_SEGMENT_SHIFT 6
+#define OCOTP_CFG3_MKT_SEGMENT_MASK (0x3 << 6)
+
+/* cpufreq-dt device registered by imx-cpufreq-dt */
+static struct platform_device *cpufreq_dt_pdev;
+static struct opp_table *cpufreq_opp_table;
+
+static int imx_cpufreq_dt_probe(struct platform_device *pdev)
+{
+ struct device *cpu_dev = get_cpu_device(0);
+ u32 cell_value, supported_hw[2];
+ int speed_grade, mkt_segment;
+ int ret;
+
+ ret = nvmem_cell_read_u32(cpu_dev, "speed_grade", &cell_value);
+ if (ret)
+ return ret;
+
+ speed_grade = (cell_value & OCOTP_CFG3_SPEED_GRADE_MASK) >> OCOTP_CFG3_SPEED_GRADE_SHIFT;
+ mkt_segment = (cell_value & OCOTP_CFG3_MKT_SEGMENT_MASK) >> OCOTP_CFG3_MKT_SEGMENT_SHIFT;
+
+ /*
+ * Early samples without fuses written report "0 0" which means
+ * consumer segment and minimum speed grading.
+ *
+ * According to datasheet minimum speed grading is not supported for
+ * consumer parts so clamp to 1 to avoid warning for "no OPPs"
+ *
+ * Applies to 8mq and 8mm.
+ */
+ if (mkt_segment == 0 && speed_grade == 0 && (
+ of_machine_is_compatible("fsl,imx8mm") ||
+ of_machine_is_compatible("fsl,imx8mq")))
+ speed_grade = 1;
+
+ supported_hw[0] = BIT(speed_grade);
+ supported_hw[1] = BIT(mkt_segment);
+ dev_info(&pdev->dev, "cpu speed grade %d mkt segment %d supported-hw %#x %#x\n",
+ speed_grade, mkt_segment, supported_hw[0], supported_hw[1]);
+
+ cpufreq_opp_table = dev_pm_opp_set_supported_hw(cpu_dev, supported_hw, 2);
+ if (IS_ERR(cpufreq_opp_table)) {
+ ret = PTR_ERR(cpufreq_opp_table);
+ dev_err(&pdev->dev, "Failed to set supported opp: %d\n", ret);
+ return ret;
+ }
+
+ cpufreq_dt_pdev = platform_device_register_data(
+ &pdev->dev, "cpufreq-dt", -1, NULL, 0);
+ if (IS_ERR(cpufreq_dt_pdev)) {
+ dev_pm_opp_put_supported_hw(cpufreq_opp_table);
+ ret = PTR_ERR(cpufreq_dt_pdev);
+ dev_err(&pdev->dev, "Failed to register cpufreq-dt: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int imx_cpufreq_dt_remove(struct platform_device *pdev)
+{
+ platform_device_unregister(cpufreq_dt_pdev);
+ dev_pm_opp_put_supported_hw(cpufreq_opp_table);
+
+ return 0;
+}
+
+static struct platform_driver imx_cpufreq_dt_driver = {
+ .probe = imx_cpufreq_dt_probe,
+ .remove = imx_cpufreq_dt_remove,
+ .driver = {
+ .name = "imx-cpufreq-dt",
+ },
+};
+module_platform_driver(imx_cpufreq_dt_driver);
+
+MODULE_ALIAS("platform:imx-cpufreq-dt");
+MODULE_DESCRIPTION("Freescale i.MX cpufreq speed grading driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c
index 1e5e64643c3a..fdc767fdbe6a 100644
--- a/drivers/cpufreq/pcc-cpufreq.c
+++ b/drivers/cpufreq/pcc-cpufreq.c
@@ -582,10 +582,10 @@ static int __init pcc_cpufreq_init(void)
/* Skip initialization if another cpufreq driver is there. */
if (cpufreq_get_current_driver())
- return 0;
+ return -EEXIST;
if (acpi_disabled)
- return 0;
+ return -ENODEV;
ret = pcc_cpufreq_probe();
if (ret) {
diff --git a/drivers/cpufreq/raspberrypi-cpufreq.c b/drivers/cpufreq/raspberrypi-cpufreq.c
new file mode 100644
index 000000000000..2bc7d9734272
--- /dev/null
+++ b/drivers/cpufreq/raspberrypi-cpufreq.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Raspberry Pi cpufreq driver
+ *
+ * Copyright (C) 2019, Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+ */
+
+#include <linux/clk.h>
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+
+#define RASPBERRYPI_FREQ_INTERVAL 100000000
+
+static struct platform_device *cpufreq_dt;
+
+static int raspberrypi_cpufreq_probe(struct platform_device *pdev)
+{
+ struct device *cpu_dev;
+ unsigned long min, max;
+ unsigned long rate;
+ struct clk *clk;
+ int ret;
+
+ cpu_dev = get_cpu_device(0);
+ if (!cpu_dev) {
+ pr_err("Cannot get CPU for cpufreq driver\n");
+ return -ENODEV;
+ }
+
+ clk = clk_get(cpu_dev, NULL);
+ if (IS_ERR(clk)) {
+ dev_err(cpu_dev, "Cannot get clock for CPU0\n");
+ return PTR_ERR(clk);
+ }
+
+ /*
+ * The max and min frequencies are configurable in the Raspberry Pi
+ * firmware, so we query them at runtime.
+ */
+ min = roundup(clk_round_rate(clk, 0), RASPBERRYPI_FREQ_INTERVAL);
+ max = roundup(clk_round_rate(clk, ULONG_MAX), RASPBERRYPI_FREQ_INTERVAL);
+ clk_put(clk);
+
+ for (rate = min; rate <= max; rate += RASPBERRYPI_FREQ_INTERVAL) {
+ ret = dev_pm_opp_add(cpu_dev, rate, 0);
+ if (ret)
+ goto remove_opp;
+ }
+
+ cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
+ ret = PTR_ERR_OR_ZERO(cpufreq_dt);
+ if (ret) {
+ dev_err(cpu_dev, "Failed to create platform device, %d\n", ret);
+ goto remove_opp;
+ }
+
+ return 0;
+
+remove_opp:
+ dev_pm_opp_remove_all_dynamic(cpu_dev);
+
+ return ret;
+}
+
+static int raspberrypi_cpufreq_remove(struct platform_device *pdev)
+{
+ struct device *cpu_dev;
+
+ cpu_dev = get_cpu_device(0);
+ if (cpu_dev)
+ dev_pm_opp_remove_all_dynamic(cpu_dev);
+
+ platform_device_unregister(cpufreq_dt);
+
+ return 0;
+}
+
+/*
+ * Since the driver depends on clk-raspberrypi, which may return EPROBE_DEFER,
+ * all the activity is performed in the probe, which may be defered as well.
+ */
+static struct platform_driver raspberrypi_cpufreq_driver = {
+ .driver = {
+ .name = "raspberrypi-cpufreq",
+ },
+ .probe = raspberrypi_cpufreq_probe,
+ .remove = raspberrypi_cpufreq_remove,
+};
+module_platform_driver(raspberrypi_cpufreq_driver);
+
+MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de");
+MODULE_DESCRIPTION("Raspberry Pi cpufreq driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:raspberrypi-cpufreq");
diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index 57e5374592bd..e5cb17d4be7b 100644
--- a/drivers/cpufreq/s5pv210-cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -478,7 +478,7 @@ static int s5pv210_target(struct cpufreq_policy *policy, unsigned int index)
arm_volt, arm_volt_max);
}
- printk(KERN_DEBUG "Perf changed[L%d]\n", index);
+ pr_debug("Perf changed[L%d]\n", index);
exit:
mutex_unlock(&set_freq_lock);