Commit a76caf55 authored by Ørjan Eide's avatar Ørjan Eide Committed by Eduardo Valentin

thermal: Add devfreq cooling

Add a generic thermal cooling device for devfreq, that is similar to
cpu_cooling.

The device must use devfreq.  In order to use the power extension of the
cooling device, it must have registered its OPPs using the OPP library.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: default avatarJavi Merino <javi.merino@arm.com>
Signed-off-by: default avatarØrjan Eide <orjan.eide@arm.com>
Signed-off-by: default avatarEduardo Valentin <edubezval@gmail.com>
parent d6d00742
......@@ -147,6 +147,20 @@ config CLOCK_THERMAL
device that is configured to use this cooling mechanism will be
controlled to reduce clock frequency whenever temperature is high.
config DEVFREQ_THERMAL
bool "Generic device cooling support"
depends on PM_DEVFREQ
depends on PM_OPP
help
This implements the generic devfreq cooling mechanism through
frequency reduction for devices using devfreq.
This will throttle the device by limiting the maximum allowed DVFS
frequency corresponding to the cooling level.
In order to use the power extensions of the cooling device,
devfreq should use the simple_ondemand governor.
If you want this support, you should say Y here.
config THERMAL_EMULATION
......
......@@ -22,6 +22,9 @@ thermal_sys-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
# clock cooling
thermal_sys-$(CONFIG_CLOCK_THERMAL) += clock_cooling.o
# devfreq cooling
thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
# platform thermal drivers
obj-$(CONFIG_QCOM_SPMI_TEMP_ALARM) += qcom-spmi-temp-alarm.o
obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
......
This diff is collapsed.
/*
* devfreq_cooling: Thermal cooling device implementation for devices using
* devfreq
*
* Copyright (C) 2014-2015 ARM Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __DEVFREQ_COOLING_H__
#define __DEVFREQ_COOLING_H__
#include <linux/devfreq.h>
#include <linux/thermal.h>
#ifdef CONFIG_DEVFREQ_THERMAL
/**
* struct devfreq_cooling_power - Devfreq cooling power ops
* @get_static_power: Take voltage, in mV, and return the static power
* in mW. If NULL, the static power is assumed
* to be 0.
* @get_dynamic_power: Take voltage, in mV, and frequency, in HZ, and
* return the dynamic power draw in mW. If NULL,
* a simple power model is used.
* @dyn_power_coeff: Coefficient for the simple dynamic power model in
* mW/(MHz mV mV).
* If get_dynamic_power() is NULL, then the
* dynamic power is calculated as
* @dyn_power_coeff * frequency * voltage^2
*/
struct devfreq_cooling_power {
unsigned long (*get_static_power)(unsigned long voltage);
unsigned long (*get_dynamic_power)(unsigned long freq,
unsigned long voltage);
unsigned long dyn_power_coeff;
};
struct devfreq_cooling_device *
of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
struct devfreq_cooling_power *dfc_power);
struct devfreq_cooling_device *
of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);
struct devfreq_cooling_device *devfreq_cooling_register(struct devfreq *df);
void devfreq_cooling_unregister(struct devfreq_cooling_device *dfc);
#else /* !CONFIG_DEVFREQ_THERMAL */
struct devfreq_cooling_device *
of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
struct devfreq_cooling_power *dfc_power)
{
return ERR_PTR(-EINVAL);
}
static inline struct devfreq_cooling_device *
of_devfreq_cooling_register(struct device_node *np, struct devfreq *df)
{
return ERR_PTR(-EINVAL);
}
static inline struct devfreq_cooling_device *
devfreq_cooling_register(struct devfreq *df)
{
return ERR_PTR(-EINVAL);
}
static inline void
devfreq_cooling_unregister(struct devfreq_cooling_device *dfc)
{
}
#endif /* CONFIG_DEVFREQ_THERMAL */
#endif /* __DEVFREQ_COOLING_H__ */
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