diff options
| -rw-r--r-- | drivers/thermal/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/thermal/cpu_cooling.c | 56 | ||||
| -rw-r--r-- | include/linux/cpu_cooling.h | 25 |
3 files changed, 76 insertions, 6 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index a150f8d5332..3feb5377fbf 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -92,6 +92,7 @@ config THERMAL_GOV_USER_SPACE config CPU_THERMAL bool "generic cpu cooling support" depends on CPU_FREQ + depends on THERMAL_OF help This implements the generic cpu cooling mechanism through frequency reduction. An ACPI version of this already exists diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c index 02a46f23d14..a6cb5531403 100644 --- a/drivers/thermal/cpu_cooling.c +++ b/drivers/thermal/cpu_cooling.c @@ -417,18 +417,21 @@ static struct notifier_block thermal_cpufreq_notifier_block = { }; /** - * cpufreq_cooling_register - function to create cpufreq cooling device. + * __cpufreq_cooling_register - helper function to create cpufreq cooling device + * @np: a valid struct device_node to the cooling device device tree node * @clip_cpus: cpumask of cpus where the frequency constraints will happen. * * This interface function registers the cpufreq cooling device with the name * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq - * cooling devices. + * cooling devices. It also gives the opportunity to link the cooling device + * with a device tree node, in order to bind it via the thermal DT code. * * Return: a valid struct thermal_cooling_device pointer on success, * on failure, it returns a corresponding ERR_PTR(). */ -struct thermal_cooling_device * -cpufreq_cooling_register(const struct cpumask *clip_cpus) +static struct thermal_cooling_device * +__cpufreq_cooling_register(struct device_node *np, + const struct cpumask *clip_cpus) { struct thermal_cooling_device *cool_dev; struct cpufreq_cooling_device *cpufreq_dev = NULL; @@ -467,8 +470,8 @@ cpufreq_cooling_register(const struct cpumask *clip_cpus) snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", cpufreq_dev->id); - cool_dev = thermal_cooling_device_register(dev_name, cpufreq_dev, - &cpufreq_cooling_ops); + cool_dev = thermal_of_cooling_device_register(np, dev_name, cpufreq_dev, + &cpufreq_cooling_ops); if (IS_ERR(cool_dev)) { release_idr(&cpufreq_idr, cpufreq_dev->id); kfree(cpufreq_dev); @@ -488,9 +491,50 @@ cpufreq_cooling_register(const struct cpumask *clip_cpus) return cool_dev; } + +/** + * cpufreq_cooling_register - function to create cpufreq cooling device. + * @clip_cpus: cpumask of cpus where the frequency constraints will happen. + * + * This interface function registers the cpufreq cooling device with the name + * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq + * cooling devices. + * + * Return: a valid struct thermal_cooling_device pointer on success, + * on failure, it returns a corresponding ERR_PTR(). + */ +struct thermal_cooling_device * +cpufreq_cooling_register(const struct cpumask *clip_cpus) +{ + return __cpufreq_cooling_register(NULL, clip_cpus); +} EXPORT_SYMBOL_GPL(cpufreq_cooling_register); /** + * of_cpufreq_cooling_register - function to create cpufreq cooling device. + * @np: a valid struct device_node to the cooling device device tree node + * @clip_cpus: cpumask of cpus where the frequency constraints will happen. + * + * This interface function registers the cpufreq cooling device with the name + * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq + * cooling devices. Using this API, the cpufreq cooling device will be + * linked to the device tree node provided. + * + * Return: a valid struct thermal_cooling_device pointer on success, + * on failure, it returns a corresponding ERR_PTR(). + */ +struct thermal_cooling_device * +of_cpufreq_cooling_register(struct device_node *np, + const struct cpumask *clip_cpus) +{ + if (!np) + return ERR_PTR(-EINVAL); + + return __cpufreq_cooling_register(np, clip_cpus); +} +EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); + +/** * cpufreq_cooling_unregister - function to remove cpufreq cooling device. * @cdev: thermal cooling device pointer. * diff --git a/include/linux/cpu_cooling.h b/include/linux/cpu_cooling.h index a5d52eea823..c303d383def 100644 --- a/include/linux/cpu_cooling.h +++ b/include/linux/cpu_cooling.h @@ -24,6 +24,7 @@ #ifndef __CPU_COOLING_H__ #define __CPU_COOLING_H__ +#include <linux/of.h> #include <linux/thermal.h> #include <linux/cpumask.h> @@ -36,6 +37,24 @@ struct thermal_cooling_device * cpufreq_cooling_register(const struct cpumask *clip_cpus); /** + * of_cpufreq_cooling_register - create cpufreq cooling device based on DT. + * @np: a valid struct device_node to the cooling device device tree node. + * @clip_cpus: cpumask of cpus where the frequency constraints will happen + */ +#ifdef CONFIG_THERMAL_OF +struct thermal_cooling_device * +of_cpufreq_cooling_register(struct device_node *np, + const struct cpumask *clip_cpus); +#else +static inline struct thermal_cooling_device * +of_cpufreq_cooling_register(struct device_node *np, + const struct cpumask *clip_cpus) +{ + return NULL; +} +#endif + +/** * cpufreq_cooling_unregister - function to remove cpufreq cooling device. * @cdev: thermal cooling device pointer. */ @@ -48,6 +67,12 @@ cpufreq_cooling_register(const struct cpumask *clip_cpus) { return NULL; } +static inline struct thermal_cooling_device * +of_cpufreq_cooling_register(struct device_node *np, + const struct cpumask *clip_cpus) +{ + return NULL; +} static inline void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) { |