On 11/26/15, Jia Hongtao <hongtao....@freescale.com> wrote:
> 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....@freescale.com>
> ---
> Changes for V2:
> * Using ->ready callback for cpu cooling device registering.
>
> drivers/cpufreq/qoriq-cpufreq.c | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/drivers/cpufreq/qoriq-cpufreq.c
> b/drivers/cpufreq/qoriq-cpufreq.c
> index 4f53fa2..a39f868 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 +262,30 @@ 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 (WARN_ON(!np))
> + return;
I doubt that WARN_ON is necessary here. Do you know the exact case
where the np is 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 +294,7 @@ 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
>
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