From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chanwoo Choi Subject: [RFC PATCH 06/15] PM / devfreq: Add devfreq_get_devfreq_by_phandle() Date: Thu, 26 Nov 2015 22:47:30 +0900 Message-ID: <1448545659-32287-7-git-send-email-cw00.choi@samsung.com> References: <1448545659-32287-1-git-send-email-cw00.choi@samsung.com> Return-path: Received: from mailout4.samsung.com ([203.254.224.34]:40834 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752095AbbKZNru (ORCPT ); Thu, 26 Nov 2015 08:47:50 -0500 In-reply-to: <1448545659-32287-1-git-send-email-cw00.choi@samsung.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: myungjoo.ham@samsung.com, kyungmin.park@samsung.com, kgene@kernel.org, k.kozlowski@samsung.com Cc: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, linux@arm.linux.org.uk, tjakobi@math.uni-bielefeld.de, cw00.choi@samsung.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org This patch adds the new devfreq_get_devfreq_by_phandle() OF helper function which can find the instance of devfreq device by using phandle ("devfreq"). Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/devfreq.h | 9 +++++++++ 2 files changed, 53 insertions(+) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 15e58779e4c0..78ea4cdaa82c 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -25,6 +25,7 @@ #include #include #include +#include #include "governor.h" static struct class *devfreq_class; @@ -686,6 +687,49 @@ struct devfreq *devm_devfreq_add_device(struct device *dev, } EXPORT_SYMBOL(devm_devfreq_add_device); +#ifdef CONFIG_OF +/* + * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree + * @dev - instance to the given device + * @index - index into list of devfreq + * + * return the instance of devfreq device + */ +struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) +{ + struct device_node *node; + struct devfreq *devfreq; + + if (!dev) + return ERR_PTR(-EINVAL); + + if (!dev->of_node) + return ERR_PTR(-EINVAL); + + node = of_parse_phandle(dev->of_node, "devfreq", index); + if (!node) + return ERR_PTR(-ENODEV); + + mutex_lock(&devfreq_list_lock); + list_for_each_entry(devfreq, &devfreq_list, node) { + if (devfreq->dev.parent + && devfreq->dev.parent->of_node == node) { + mutex_unlock(&devfreq_list_lock); + return devfreq; + } + } + mutex_unlock(&devfreq_list_lock); + + return ERR_PTR(-EPROBE_DEFER); +} +#else +struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) +{ + return ERR_PTR(-ENODEV); +} +#endif /* CONFIG_OF */ +EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); + /** * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() * @dev: the device to add devfreq feature. diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index f7a6e6bd716e..d648041145ba 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -211,6 +211,9 @@ extern int devm_devfreq_register_opp_notifier(struct device *dev, extern void devm_devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq); +extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, + int index); + /** * devfreq_update_stats() - update the last_status pointer in struct devfreq * @df: the devfreq instance whose status needs updating @@ -324,6 +327,12 @@ static inline void devm_devfreq_unregister_opp_notifier(struct device *dev, { } +static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, + int index) +{ + return ERR_PTR(-ENODEV); +} + static inline int devfreq_update_stats(struct devfreq *df) { return -EINVAL; -- 1.9.1