Register the imx6q cpufreq driver as a cooling device
based on the thermal device tree framework.
When temperature exceeds the passive trip point, cpufreq
driver will be used to throttle CPUs.
Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
---
drivers/cpufreq/imx6q-cpufreq.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 83cf631..27ce84d 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -9,6 +9,7 @@
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
+#include <linux/cpu_cooling.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
@@ -50,6 +51,7 @@ static struct clk_bulk_data clks[] = {
};
static struct device *cpu_dev;
+struct thermal_cooling_device *cdev;
static bool free_opp;
static struct cpufreq_frequency_table *freq_table;
static unsigned int max_freq;
@@ -202,6 +204,11 @@ static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
return ret;
}
+static void imx6q_cpufreq_ready(struct cpufreq_policy *policy)
+{
+ cdev = of_cpufreq_cooling_register(policy);
+}
+
static struct cpufreq_driver imx6q_cpufreq_driver = {
.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
.verify = cpufreq_generic_frequency_table_verify,
@@ -210,6 +217,7 @@ static struct cpufreq_driver imx6q_cpufreq_driver = {
.init = imx6q_cpufreq_init,
.name = "imx6q-cpufreq",
.attr = cpufreq_generic_attr,
+ .ready = imx6q_cpufreq_ready,
.suspend = cpufreq_generic_suspend,
};
@@ -482,6 +490,7 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev)
static int imx6q_cpufreq_remove(struct platform_device *pdev)
{
+ cpufreq_cooling_unregister(cdev);
cpufreq_unregister_driver(&imx6q_cpufreq_driver);
dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
if (free_opp)
--
2.7.4
--
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