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>

diff --git a/drivers/cpufreq/qoriq-cpufreq.c b/drivers/cpufreq/qoriq-cpufreq.c
index 358f0752c31e26956adc41b0a93867921069de8f..b23e525a7af3fc21ad9fa85be59d3cb6a3ba27ba 100644 (file)
--- 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,
 };