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cpufreq: qoriq: Register cooling device based on device tree 

Register the qoriq cpufreq driver as a cooling device, based on the
thermal device tree framework. When temperature crosses the passive trip
point cpufreq is used to throttle CPUs.

Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hongtao Jia 2015-11-26 17:21:11 +08:00 committed by Rafael J. Wysocki
parent 790d849bf8
commit 8ae1702a0d
1 changed files with 24 additions and 0 deletions
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24
drivers/cpufreq/qoriq-cpufreq.c
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@ -12,6 +12,7 @@
#include <linux/clk.h>
#include <linux/cpufreq.h>
#include <linux/cpu_cooling.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
@ -33,6 +34,7 @@
struct cpu_data {
struct clk **pclk;
struct cpufreq_frequency_table *table;
struct thermal_cooling_device *cdev;
};
/**
@ -321,6 +323,27 @@ static int qoriq_cpufreq_target(struct cpufreq_policy *policy,
return clk_set_parent(policy->clk, parent);
}
static void qoriq_cpufreq_ready(struct cpufreq_policy *policy)
{
struct cpu_data *cpud = policy->driver_data;
struct device_node *np = of_get_cpu_node(policy->cpu, NULL);
if (of_find_property(np, "#cooling-cells", NULL)) {
cpud->cdev = of_cpufreq_cooling_register(np,
policy->related_cpus);
if (IS_ERR(cpud->cdev)) {
pr_err("Failed to register cooling device cpu%d: %ld\n",
policy->cpu, PTR_ERR(cpud->cdev));
cpud->cdev = NULL;
}
}
of_node_put(np);
}
static struct cpufreq_driver qoriq_cpufreq_driver = {
.name = "qoriq_cpufreq",
.flags = CPUFREQ_CONST_LOOPS,
@ -329,6 +352,7 @@ static struct cpufreq_driver qoriq_cpufreq_driver = {
.verify = cpufreq_generic_frequency_table_verify,
.target_index = qoriq_cpufreq_target,
.get = cpufreq_generic_get,
.ready = qoriq_cpufreq_ready,
.attr = cpufreq_generic_attr,
};