[PATCH V3] cpufreq: qoriq: Register cooling device based on device tree

Jia Hongtao
2015-11-26T09:28:22Z

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>
---
Changes for V3:
* Removed unnecessary cpu node NULL check.

Changes for V2:
* Using ->ready callback for cpu cooling device registering.

drivers/cpufreq/qoriq-cpufreq.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/drivers/cpufreq/qoriq-cpufreq.c b/drivers/cpufreq/qoriq-cpufreq.c
index 4f53fa2..cb6a62c 100644
--- a/drivers/cpufreq/qoriq-cpufreq.c
+++ b/drivers/cpufreq/qoriq-cpufreq.c
@@ -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;
};

/*
@@ -260,6 +262,27 @@ 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,
@@ -268,6 +291,7 @@ 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,
};

--
2.1.0.27.g96db324