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>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/cpufreq/qoriq-cpufreq.c b/drivers/cpufreq/qoriq-cpufreq.c
index 358f0752c31e..b23e525a7af3 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;
 };
 
 /**
@@ -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,
 };