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Mon, 11 Apr 2016 12:57:59 +0900 (KST) From: Chanwoo Choi To: myungjoo.ham@samsung.com, kyungmin.park@samsung.com, k.kozlowski@samsung.com, kgene@kernel.org, s.nawrocki@samsung.com, tomasz.figa@gmail.com Subject: [PATCH v9 03/20] PM / devfreq: Add devfreq_get_devfreq_by_phandle() Date: Mon, 11 Apr 2016 12:57:41 +0900 Message-id: <1460347078-15175-4-git-send-email-cw00.choi@samsung.com> X-Mailer: git-send-email 1.8.0 In-reply-to: <1460347078-15175-1-git-send-email-cw00.choi@samsung.com> References: <1460347078-15175-1-git-send-email-cw00.choi@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrNIsWRmVeSWpSXmKPExsWyRsSkQPeEAne4wemNUhbXvzxntZh/5Byr Rf+bhawW516tZLSYdH8Ci8XrF4YW/Y9fM1ucbXrDbrHp8TVWi8u75rBZfO49wmgx4/w+Jot1 G2+xW9y+zGvx8sgPRoul1y8yWdxuXMFmMWH6WhaLM6cvsVq07j3CbnH4TTurRdvqD6wWq3b9 YXQQ91gzbw2jR0tzD5vH5b5eJo9bd+o9ds66y+6xcvkXNo9NqzrZPDYvqff4d4zdY8vVdhaP vi2rGD0+b5IL4InisklJzcksSy3St0vgyri67xZLwSXJinuzpjA2MB4V7WLk5JAQMJH40XKB DcIWk7hwbz2QzcUhJLCCUeL1s9lMMEWNx7tYIBKzGCV2HTzOCOF8YZRYsXYNWBWbgJbE/hc3 wNpFBKYySnw+1QbWwixwhFli6sYbYFXCAj4S5549YwSxWQRUJY5M2sUCYvMKuEr0zLnECLFP TuLDnkfsIDangJvEp/XtrF2MHEDrXCWefa4DmSkhcIJD4uoViBoWAQGJb5MPsYDUSAjISmw6 wAwxRlLi4IobLBMYhRcwMqxiFE0tSC4oTkovMtYrTswtLs1L10vOz93ECIzj0/+e9e9gvHvA +hCjAAejEg+vwzWucCHWxLLiytxDjKZAGyYyS4km5wOTRV5JvKGxmZGFqYmpsZG5pZmSOO9C qZ/BQgLpiSWp2ampBalF8UWlOanFhxiZODilGhjZvFJOBvbnzjl+/xfXFI8QwzgPk3jVJ6d6 uS37lrf+l+NKv6vq8Cl5AVvFzavSBys3WpVOeyn9sahYu9bgo9Eu19Z54SpTpn59/yzktjGX 3dvEy55b/MSy97usUBI/9VPN6rDg/7Vi82dOkgthrpu8qunPb0OdDfkxLm89OW5u/nK26l5l 0XslluKMREMt5qLiRAAupQw73gIAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBKsWRmVeSWpSXmKPExsVy+t9jQd0TCtzhBjO6hC2uf3nOajH/yDlW i/43C1ktzr1ayWgx6f4EFovXLwwt+h+/ZrY42/SG3WLT42usFpd3zWGz+Nx7hNFixvl9TBbr Nt5it7h9mdfi5ZEfjBZLr19ksrjduILNYsL0tSwWZ05fYrVo3XuE3eLwm3ZWi7bVH1gtVu36 w+gg7rFm3hpGj5bmHjaPy329TB637tR77Jx1l91j5fIvbB6bVnWyeWxeUu/x7xi7x5ar7Swe fVtWMXp83iQXwBPVwGiTkZqYklqkkJqXnJ+SmZduq+QdHO8cb2pmYKhraGlhrqSQl5ibaqvk 4hOg65aZA/S1kkJZYk4pUCggsbhYSd8O04TQEDddC5jGCF3fkCC4HiMDNJCwhjHj6r5bLAWX JCvuzZrC2MB4VLSLkZNDQsBEovF4FwuELSZx4d56ti5GLg4hgVmMErsOHmeEcL4wSqxYu4YJ pIpNQEti/4sbYFUiAlMZJT6famMBcZgFjjBLTN14A6xKWMBH4tyzZ4wgNouAqsSRSbvAdvAK uEr0zLnECLFPTuLDnkfsIDangJvEp/XtrF2MHEDrXCWefa6bwMi7gJFhFaNEakFyQXFSeq5R Xmq5XnFibnFpXrpecn7uJkZwqngmvYPx8C73Q4wCHIxKPLwvLnOFC7EmlhVX5h5ilOBgVhLh fSDLHS7Em5JYWZValB9fVJqTWnyI0RToronMUqLJ+cA0llcSb2hsYmZkaWRuaGFkbK4kzvv4 /7owIYH0xJLU7NTUgtQimD4mDk6pBsZSwZVhXN3yckz+vRu+PVP7Zfavz9utbfKr+DMHjUtz Or/O08vym5JiWH5fIWl7qsq10+avow4kbQhNUtokuv/AzIdlWlcXbGLuecxsNDFY9NtTfdP6 OZum+NuK//RfHiFh92fq4xXqciJuetqbHwZpcjNHJxZazP1UdOP/KUu7+bueGeWmbFdiKc5I NNRiLipOBABXyT9bKwMAAA== DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160410_205828_105154_9934748C X-CRM114-Status: GOOD ( 15.03 ) X-Spam-Score: -7.9 (-------) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, inki.dae@samsung.com, linux-samsung-soc@vger.kernel.org, linux@arm.linux.org.uk, cw00.choi@samsung.com, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, linux.amoon@gmail.com, linux-pm@vger.kernel.org, rjw@rjwysocki.net, linux-kernel@vger.kernel.org, m.reichl@fivetechno.de, tjakobi@math.uni-bielefeld.de, devicetree@vger.kernel.org, robh+dt@kernel.org, galak@codeaurora.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-3.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RDNS_NONE,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 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 Signed-off-by: MyungJoo Ham [m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board] Tested-by: Markus Reichl Tested-by: Anand Moon Acked-by: Krzysztof Kozlowski --- 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 984c5e9e7bdd..20a9422c2552 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; @@ -639,6 +640,49 @@ 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 6fa02a20eb63..aa0b8424ebc3 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -208,6 +208,9 @@ 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 @@ -307,6 +310,12 @@ 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;