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Subject[PATCH V2 4/7] thermal/drivers/Kconfig: Convert the CPU cooling device to a choice
Date
The next changes will add new way to cool down a CPU. In order to
sanitize and make the overall cpu cooling code consistent and robust
we must prevent the cpu cooling devices to co-exists with the same
purpose at the same time in the kernel.

Make the CPU cooling device a choice in the Kconfig, so only one CPU
cooling strategy can be chosen.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
drivers/thermal/Kconfig | 20 +++++++++++++++++---
drivers/thermal/cpu_cooling.c | 2 ++
include/linux/cpu_cooling.h | 6 +++---
3 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index b6adc54..5aaae1b 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -142,17 +142,31 @@ config THERMAL_GOV_POWER_ALLOCATOR
allocating and limiting power to devices.

config CPU_THERMAL
- bool "generic cpu cooling support"
- depends on CPU_FREQ
+ bool "Generic cpu cooling support"
depends on THERMAL_OF
help
+ Enable the CPU cooling features. If the system has no active
+ cooling device available, this option allows to use the CPU
+ as a cooling device.
+
+choice
+ prompt "CPU cooling strategies"
+ depends on CPU_THERMAL
+ default CPU_FREQ_THERMAL
+ help
+ Select the CPU cooling strategy.
+
+config CPU_FREQ_THERMAL
+ bool "CPU frequency cooling strategy"
+ depends on CPU_FREQ
+ help
This implements the generic cpu cooling mechanism through frequency
reduction. An ACPI version of this already exists
(drivers/acpi/processor_thermal.c).
This will be useful for platforms using the generic thermal interface
and not the ACPI interface.

- If you want this support, you should say Y here.
+endchoice

config CLOCK_THERMAL
bool "Generic clock cooling support"
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index 7bdc19f..5c219dc 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -22,6 +22,7 @@

#include <trace/events/thermal.h>

+#ifdef CONFIG_CPU_FREQ_THERMAL
/*
* Cooling state <-> CPUFreq frequency
*
@@ -926,3 +927,4 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
kfree(cpufreq_cdev);
}
EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister);
+#endif /* CONFIG_CPU_FREQ_THERMAL */
diff --git a/include/linux/cpu_cooling.h b/include/linux/cpu_cooling.h
index d4292eb..c0accc7 100644
--- a/include/linux/cpu_cooling.h
+++ b/include/linux/cpu_cooling.h
@@ -33,7 +33,7 @@ struct cpufreq_policy;
typedef int (*get_static_t)(cpumask_t *cpumask, int interval,
unsigned long voltage, u32 *power);

-#ifdef CONFIG_CPU_THERMAL
+#ifdef CONFIG_CPU_FREQ_THERMAL
/**
* cpufreq_cooling_register - function to create cpufreq cooling device.
* @policy: cpufreq policy.
@@ -84,7 +84,7 @@ of_cpufreq_power_cooling_register(struct device_node *np,
*/
void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev);

-#else /* !CONFIG_CPU_THERMAL */
+#else /* !CONFIG_CPU_FREQ_THERMAL */
static inline struct thermal_cooling_device *
cpufreq_cooling_register(struct cpufreq_policy *policy)
{
@@ -118,6 +118,6 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
{
return;
}
-#endif /* CONFIG_CPU_THERMAL */
+#endif /* CONFIG_CPU_FREQ_THERMAL */

#endif /* __CPU_COOLING_H__ */
--
2.7.4
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