From patchwork Mon Jul 20 01:13:39 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chanwoo Choi X-Patchwork-Id: 6824871 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 0408AC05AC for ; Mon, 20 Jul 2015 01:14:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6239F20643 for ; Mon, 20 Jul 2015 01:14:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 792432054A for ; Mon, 20 Jul 2015 01:14:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755314AbbGTBOH (ORCPT ); Sun, 19 Jul 2015 21:14:07 -0400 Received: from mailout1.samsung.com ([203.254.224.24]:60710 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754202AbbGTBNp (ORCPT ); Sun, 19 Jul 2015 21:13:45 -0400 Received: from epcpsbgr4.samsung.com (u144.gpu120.samsung.co.kr [203.254.230.144]) by mailout1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0NRR015IYI2SQB10@mailout1.samsung.com>; Mon, 20 Jul 2015 10:13:41 +0900 (KST) Received: from epcpsbgm2.samsung.com ( [172.20.52.115]) by epcpsbgr4.samsung.com (EPCPMTA) with SMTP id 91.8C.20564.44B4CA55; Mon, 20 Jul 2015 10:13:40 +0900 (KST) X-AuditID: cbfee690-f796f6d000005054-c1-55ac4b44ac6a Received: from epmmp2 ( [203.254.227.17]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id B5.3A.05312.44B4CA55; Mon, 20 Jul 2015 10:13:40 +0900 (KST) Received: from chan.10.32.193.11 ([10.252.81.195]) by mmp2.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0NRR00JOHI2RN870@mmp2.samsung.com>; Mon, 20 Jul 2015 10:13:40 +0900 (KST) From: Chanwoo Choi To: edubezval@gmail.com, rui.zhang@intel.com, myungjoo.ham@samsung.com, kyungmin.park@samsung.com Cc: ulf.hansson@linaro.org, khilman@linaro.org, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, inki.dae@samsung.com, l.majewski@samsung.com, cw00.choi@samsung.com, punit.agrawal@arm.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v2 2/2] thermal: devfreq_cooling: Add generic devfreq cooling device implementaion Date: Mon, 20 Jul 2015 10:13:39 +0900 Message-id: <1437354819-6108-3-git-send-email-cw00.choi@samsung.com> X-Mailer: git-send-email 1.8.5.5 In-reply-to: <1437354819-6108-1-git-send-email-cw00.choi@samsung.com> References: <1437354819-6108-1-git-send-email-cw00.choi@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprFIsWRmVeSWpSXmKPExsWyRsSkWNfFe02owbyplhbXvzxntZh/5ByQ uHKN1eLcq5WMFpPuT2Cx+Hp4BaPF2aY37BZvHm5mtLi8aw6bxefeI4wWS69fZLK43biCzWLC 9LUsFs/fn2ayaN17hN3iycM+Novja8MdBD3WzFvD6LFz1l12j5XLv7B5LN7zkslj06pONo87 1/awefRtWcXo8XmTXABHFJdNSmpOZllqkb5dAlfGzgXvmAp+NjFWXO9ay9LAODGni5GDQ0LA ROLj1bIuRk4gU0ziwr31bCC2kMBSRolzk9Qh4iYSd3v+sXYxcgHFpzNKdDV8YoFwvjBKrHp5 hxGkik1AS2L/ixtg3SICyRIbZtwH62AWOMwksfTQJ3aQhLBAisTPH1fZQDazCKhK/HqQChLm FXCRmDjxNTvENgWJZctnsoLYnAKuEl8vfWSHuMhF4vvcycwQNX/ZJQ7/4gCxWQQEJL5NPsQC 8YysxKYDUCWSEgdX3GCZwCi8gJFhFaNoakFyQXFSepGJXnFibnFpXrpecn7uJkZglJ3+92zC DsZ7B6wPMQpwMCrx8Ar8XR0qxJpYVlyZe4jRFGjDRGYp0eR8YCznlcQbGpsZWZiamBobmVua KYnzvpb6GSwkkJ5YkpqdmlqQWhRfVJqTWnyIkYmDU6qB0XlXVLlxum2CW7+j5t7bMjGFVYkq ixij1A1vK85Qe5LRxXHtwsvHC85n6S+89OHi2seK9n8axA5s+bDr78qdGvMqzypzeW2fxFM2 Peuk5r9UjhMb5Z8G783xjS6ysuNwqNK9dadN6bawVljdFIdZMvsnHjm/3kJUclWEYcrs/ORX 079cl7sSp8RSnJFoqMVcVJwIAABMqdutAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrOIsWRmVeSWpSXmKPExsVy+t9jQV0X7zWhBj/eGVhc//Kc1WL+kXNA 4so1Votzr1YyWky6P4HF4uvhFYwWZ5vesFu8ebiZ0eLyrjlsFp97jzBaLL1+kcniduMKNosJ 09eyWDx/f5rJonXvEXaLJw/72CyOrw13EPRYM28No8fOWXfZPVYu/8LmsXjPSyaPTas62Tzu XNvD5tG3ZRWjx+dNcgEcUQ2MNhmpiSmpRQqpecn5KZl56bZK3sHxzvGmZgaGuoaWFuZKCnmJ uam2Si4+AbpumTlAfygplCXmlAKFAhKLi5X07TBNCA1x07WAaYzQ9Q0JgusxMkADCWsYM3Yu eMdU8LOJseJ611qWBsaJOV2MnBwSAiYSd3v+sULYYhIX7q1n62Lk4hASmM4o0dXwiQXC+cIo serlHUaQKjYBLYn9L26wgdgiAskSG2bcZwUpYhY4zCSx9NAndpCEsECKxM8fV4GKODhYBFQl fj1IBQnzCrhITJz4mh1im4LEsuUzwTZzCrhKfL30ESwuBFTzfe5k5gmMvAsYGVYxiqYWJBcU J6XnGukVJ+YWl+al6yXn525iBEfyM+kdjKsaLA4xCnAwKvHw7vi1OlSINbGsuDL3EKMEB7OS CG+GyJpQId6UxMqq1KL8+KLSnNTiQ4ymQEdNZJYSTc4HJpm8knhDYxMzI0sjc0MLI2NzJXHe k/k+oUIC6YklqdmpqQWpRTB9TBycUg2MLIz3MjLUMj0+Sffd4/y3cZvhFaETCvM/VE7MrvnX ufPL14MPst70P1N41KG+SmZ3PkParYcb6tnCBeYpXbXdv6d5+YVnsV4t69ctd4gQVPw+y+uo Ap976rrPV4u2M53W0JjuOlk3MeXnHeuIw5uMl270OGH6Y8aUmvPR65o+qq7SzH8fZxx8T4ml OCPRUIu5qDgRAKSdDuL6AgAA DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-8.1 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch add the generi devfreq cooling device for generic thermal framework. The devfreq devices are used ad cooling device to reduce the overheating temperature. This patch is based on drivers/thermal/cpu_cooling.c. The devfreq cooling device can change the ragne of the frequency table of devfreq device according to cooling level in device tree file. Cc: Zhang Rui Cc: Eduardo Valentin Cc: MyungJoo Ham Cc: Kyungmin Park Signed-off-by: Chanwoo Choi --- .../devicetree/bindings/thermal/thermal.txt | 8 +- drivers/thermal/Kconfig | 11 + drivers/thermal/Makefile | 3 + drivers/thermal/devfreq-cooling.c | 310 +++++++++++++++++++++ include/linux/devfreq-cooling.h | 80 ++++++ 5 files changed, 408 insertions(+), 4 deletions(-) create mode 100644 drivers/thermal/devfreq-cooling.c create mode 100644 include/linux/devfreq-cooling.h diff --git a/Documentation/devicetree/bindings/thermal/thermal.txt b/Documentation/devicetree/bindings/thermal/thermal.txt index 8a49362dea6e..4201fb606cb2 100644 --- a/Documentation/devicetree/bindings/thermal/thermal.txt +++ b/Documentation/devicetree/bindings/thermal/thermal.txt @@ -43,10 +43,10 @@ Required property: Cooling devices are nodes providing control on power dissipation. There are essentially two ways to provide control on power dissipation. First is by means of regulating device performance, which is known as passive -cooling. A typical passive cooling is a CPU that has dynamic voltage and -frequency scaling (DVFS), and uses lower frequencies as cooling states. -Second is by means of activating devices in order to remove -the dissipated heat, which is known as active cooling, e.g. regulating +cooling. A typical passive cooling is a CPU and Devfreq device that has +dynamic voltage and frequency scaling (DVFS), and uses lower frequencies +as cooling states. Second is by means of activating devices in order to +remove the dissipated heat, which is known as active cooling, e.g. regulating fan speeds. In both cases, cooling devices shall have a way to determine the state of cooling in which the device is. diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 118938ee8552..764502d83de7 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -137,6 +137,17 @@ config CPU_THERMAL If you want this support, you should say Y here. +config DEVFREQ_THERMAL + bool "generic devfreq cooling support" + depends on PM_DEVFREQ + depends on THERMAL_OF + help + This implements the generic devfreq cooling mechanism through frequency + reduction. This will be useful for platforms using the generic thermal + interface. + + If you want this support, you should say Y here. + config CLOCK_THERMAL bool "Generic clock cooling support" depends on COMMON_CLK diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 535dfee1496f..c5ca0cc3ff95 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -19,6 +19,9 @@ thermal_sys-$(CONFIG_THERMAL_GOV_POWER_ALLOCATOR) += power_allocator.o # cpufreq cooling thermal_sys-$(CONFIG_CPU_THERMAL) += cpu_cooling.o +# devfreq cooling +thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq-cooling.o + # clock cooling thermal_sys-$(CONFIG_CLOCK_THERMAL) += clock_cooling.o diff --git a/drivers/thermal/devfreq-cooling.c b/drivers/thermal/devfreq-cooling.c new file mode 100644 index 000000000000..5eb30bc3129b --- /dev/null +++ b/drivers/thermal/devfreq-cooling.c @@ -0,0 +1,310 @@ +/* + * linux/drivers/thermal/devfreq-cooling.c + * + * Copyright (C) 2015 Samsung Electronics Co., Ltd + * Author: Chanwoo Choi + * + * This driver is based on drivers/thermal/cpu_cooling.c. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ +#include +#include +#include +#include +#include +#include + +/* + * Cooling state <-> devfreq frequency + * + * Cooling states are translated to frequencies throughout this driver and this + * is the relation between them. + * + * Highest cooling state corresponds to lowest possible frequency. + * + * i.e. + * level 0 --> 1st Max Freq + * level 1 --> 2nd Max Freq + * ... + */ + +/** + * struct devfreq_cooling_device - data for cooling device with devfreq + * @cool_dev: thermal_cooling_device pointer to keep track of the + * registered cooling device. + * @devfreq: the devfreq instance. + * @cur_state: integer value representing the current state of devfreq + * cooling devices. + * @max_state: interger value representing the maximum state of devfreq + * cooling devices. + * + * This structure is required for keeping information of each registered + * devfreq_cooling_device. + */ +struct devfreq_cooling_device { + struct thermal_cooling_device *cool_dev; + struct devfreq *devfreq; + + unsigned int cur_state; + unsigned int max_state; + + unsigned int *freq_table; /* In descending order */ +}; + +/* devfreq cooling device callback functions are defined below */ + +/** + * devfreq_get_max_state - callback function to get the max cooling state. + * @cdev: thermal cooling device pointer. + * @state: fill this variable with the max cooling state. + * + * Callback for the thermal cooling device to return the devfreq + * max cooling state. + * + * Return: 0 on success, an error code otherwise. + */ +static int devfreq_get_max_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct devfreq_cooling_device *devfreq_device = cdev->devdata; + + *state = devfreq_device->max_state; + + return 0; +} + +/** + * devfreq_get_cur_state - callback function to get the current cooling state. + * @cdev: thermal cooling device pointer. + * @state: fill this variable with the current cooling state. + * + * Callback for the thermal cooling device to return the devfreq + * current cooling state. + * + * Return: 0 on success, an error code otherwise. + */ +static int devfreq_get_cur_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct devfreq_cooling_device *devfreq_device = cdev->devdata; + + *state = devfreq_device->cur_state; + + return 0; +} + +/** + * devfreq_set_cur_state - callback function to set the current cooling state. + * @cdev: thermal cooling device pointer. + * @state: set this variable to the current cooling state. + * + * Callback for the thermal cooling device to change the devfreq + * current cooling state. + * + * Return: 0 on success, an error code otherwise. + */ +static int devfreq_set_cur_state(struct thermal_cooling_device *cdev, + unsigned long state) +{ + struct devfreq_cooling_device *devfreq_dev = cdev->devdata; + unsigned int limited_freq; + + /* Request state should be less than max_level */ + if (WARN_ON(state > devfreq_dev->max_state)) + return -EINVAL; + + /* Check if the old cooling action is same as new cooling action */ + if (devfreq_dev->cur_state == state) + return 0; + + limited_freq = devfreq_dev->freq_table[state]; + + devfreq_dev->cur_state = state; + + /* Set the limited frequency to maximum frequency of devfreq */ + devfreq_dev->devfreq->max_freq = limited_freq; + update_devfreq(devfreq_dev->devfreq); + + return 0; +} + +/* Bind devfreq callbacks to thermal cooling device ops */ +static struct thermal_cooling_device_ops const devfreq_cooling_ops = { + .get_max_state = devfreq_get_max_state, + .get_cur_state = devfreq_get_cur_state, + .set_cur_state = devfreq_set_cur_state, +}; + +/** + * __devfreq_cooling_register - helper function to create devfreq cooling device + * @np: a valid struct device_node to the cooling device tree node + * @devfreq: the devfreq instance. + * + * This interface function registers the devfreq cooling device with the name + * "thermal-devfreq-%x". This api can support multiple instances of devfreq + * 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(). + */ +static struct thermal_cooling_device * +__devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq) +{ + struct thermal_cooling_device *cool_dev; + struct devfreq_cooling_device *devfreq_dev; + struct devfreq_dev_profile *devfreq_profile = devfreq->profile; + struct dev_pm_opp *opp; + static atomic_t devfreq_cooling_no = ATOMIC_INIT(-1); + char dev_name[THERMAL_NAME_LENGTH]; + unsigned long freq; + int i; + + devfreq_dev = kzalloc(sizeof(*devfreq_dev), GFP_KERNEL); + if (!devfreq_dev) + return ERR_PTR(-ENOMEM); + + rcu_read_lock(); + devfreq_dev->max_state = dev_pm_opp_get_opp_count(devfreq->dev.parent); + if (devfreq_dev->max_state <= 0) { + rcu_read_unlock(); + cool_dev = ERR_PTR(-EINVAL); + goto free_cdev; + } + devfreq_dev->max_state -= 1; + rcu_read_unlock(); + + /* + * Use the freq_table of devfreq_dev_profile structure + * if the devfreq_dev_profile includes already filled frequency table. + */ + if (devfreq_profile->freq_table) { + devfreq_dev->freq_table = devfreq_profile->freq_table; + goto register_cooling_dev; + } + + /* Allocate the frequency table and fill it */ + rcu_read_lock(); + devfreq_dev->freq_table = kzalloc(sizeof(*devfreq_dev->freq_table) * + devfreq_dev->max_state, GFP_KERNEL); + if (!devfreq_dev->freq_table) { + rcu_read_unlock(); + cool_dev = ERR_PTR(-ENOMEM); + goto free_cdev; + } + + freq = ULONG_MAX; + for (i = 0; i <= devfreq_dev->max_state; i++, freq--) { + opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, + &freq); + if (IS_ERR(opp)) { + rcu_read_unlock(); + cool_dev = ERR_PTR(-EINVAL); + goto free_table; + } + devfreq_dev->freq_table[i] = freq; + } + rcu_read_unlock(); + +register_cooling_dev: + /* Register cooling device with devfreq device */ + snprintf(dev_name, sizeof(dev_name), "thermal-devfreq-%d", + atomic_inc_return(&devfreq_cooling_no)); + + cool_dev = thermal_of_cooling_device_register(np, dev_name, devfreq_dev, + &devfreq_cooling_ops); + if (IS_ERR(cool_dev)) + goto free_table; + + devfreq_dev->devfreq = devfreq; + devfreq_dev->cool_dev = cool_dev; + + return cool_dev; + +free_table: + kfree(devfreq_dev->freq_table); +free_cdev: + kfree(devfreq_dev); + + return cool_dev; +} + +/** + * of_devfreq_cooling_register - function to create devfreq cooling device. + * @np: a valid struct device_node to the cooling device tree node + * @devfreq: the devfreq instance. + * + * This interface function registers the devfreq cooling device with the name + * "thermal-devfreq-%x". This api can support multiple instances of devfreq + * cooling devices. Using this API, the devfreq 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_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq) +{ + if (!np || !devfreq) + return ERR_PTR(-EINVAL); + + return __devfreq_cooling_register(np, devfreq); +} +EXPORT_SYMBOL_GPL(of_devfreq_cooling_register); + +/** + * devfreq_cooling_register - function to create devfreq cooling device. + * @devfreq: the devfreq instance. + * + * This interface function registers the devfreq cooling device with the name + * "thermal-devfreq-%x". This api can support multiple instances of devfreq + * cooling devices. + * + * Return: a valid struct thermal_cooling_device pointer on success, + * on failure, it returns a corresponding ERR_PTR(). + */ +struct thermal_cooling_device * +devfreq_cooling_register(struct devfreq *devfreq) +{ + if (!devfreq) + return ERR_PTR(-EINVAL); + + return __devfreq_cooling_register(NULL, devfreq); +} +EXPORT_SYMBOL_GPL(devfreq_cooling_register); + +/** + * devfreq_cooling_unregister - function to remove devfreq cooling device. + * @cdev: thermal cooling device pointer. + * + * This interface function unregisters the "thermal-devfreq-%x" cooling device. + */ +void devfreq_cooling_unregister(struct thermal_cooling_device *cdev) +{ + struct devfreq_cooling_device *devfreq_dev; + + if (!cdev) + return; + + devfreq_dev = cdev->devdata; + + thermal_cooling_device_unregister(devfreq_dev->cool_dev); + kfree(devfreq_dev->freq_table); + kfree(devfreq_dev); +} +EXPORT_SYMBOL_GPL(devfreq_cooling_unregister); diff --git a/include/linux/devfreq-cooling.h b/include/linux/devfreq-cooling.h new file mode 100644 index 000000000000..eec9c7494e72 --- /dev/null +++ b/include/linux/devfreq-cooling.h @@ -0,0 +1,80 @@ +/* + * linux/include/linux/devfreq-cooling.h + * + * Copyright (C) 2015 Samsung Electronics Co., Ltd + * Author: Chanwoo Choi + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#ifndef __DEVFREQ_COOLING_H__ +#define __DEVFREQ_COOLING_H__ + +#include +#include +#include + +#ifdef CONFIG_DEVFREQ_THERMAL +/** + * devfreq_cooling_register - function to create devfreq cooling device. + * @devfreq: the devfreq instance. + */ +struct thermal_cooling_device * +devfreq_cooling_register(struct devfreq *devfreq); + +/** + * of_devfreq_cooling_register - create devfreq cooling device based on DT. + * @np: a valid struct device_node to the cooling device tree node + * @devfreq: the devfreq instance. + */ +#ifdef CONFIG_THERMAL_OF +struct thermal_cooling_device * +of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq); +#else +static inline struct thermal_cooling_device * +of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq) +{ + return ERR_PTR(-ENOSYS); +} +#endif + +/** + * devfreq_cooling_unregister - function to remove devfreq cooling device. + * @cdev: thermal cooling device pointer. + */ +void devfreq_cooling_unregister(struct thermal_cooling_device *cdev); + +#else /* !CONFIG_DEVFREQ_THERMAL */ +static inline struct thermal_cooling_device * +devfreq_cooling_register(struct devfreq *devfreq) +{ + return ERR_PTR(-ENOSYS); +} +static inline struct thermal_cooling_device * +of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq) +{ + return ERR_PTR(-ENOSYS); +} + +static inline +void devfreq_cooling_unregister(struct thermal_cooling_device *cdev) +{ + return; +} +#endif /* CONFIG_DEVFREQ_THERMAL */ + +#endif /* __DEVFREQ_COOLING_H__ */