44 lines
1.6 KiB
Plaintext
44 lines
1.6 KiB
Plaintext
CPU cooling APIs How To
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===================================
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Written by Amit Daniel Kachhap <amit.kachhap@linaro.org>
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Updated: 6 Jan 2015
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Copyright (c) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
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0. Introduction
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The generic cpu cooling(freq clipping) provides registration/unregistration APIs
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to the caller. The binding of the cooling devices to the trip point is left for
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the user. The registration APIs returns the cooling device pointer.
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1. cpu cooling APIs
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1.1 cpufreq registration/unregistration APIs
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1.1.1 struct thermal_cooling_device *cpufreq_cooling_register(
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struct cpumask *clip_cpus)
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This interface function registers the cpufreq cooling device with the name
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"thermal-cpufreq-%x". This api can support multiple instances of cpufreq
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cooling devices.
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clip_cpus: cpumask of cpus where the frequency constraints will happen.
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1.1.2 struct thermal_cooling_device *of_cpufreq_cooling_register(
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struct device_node *np, const struct cpumask *clip_cpus)
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This interface function registers the cpufreq cooling device with
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the name "thermal-cpufreq-%x" linking it with a device tree node, in
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order to bind it via the thermal DT code. This api can support multiple
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instances of cpufreq cooling devices.
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np: pointer to the cooling device device tree node
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clip_cpus: cpumask of cpus where the frequency constraints will happen.
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1.1.3 void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
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This interface function unregisters the "thermal-cpufreq-%x" cooling device.
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cdev: Cooling device pointer which has to be unregistered.
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