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Fri, 08 Apr 2016 13:25:11 +0900 (KST) From: Chanwoo Choi To: myungjoo.ham@samsung.com, kyungmin.park@samsung.com, k.kozlowski@samsung.com, kgene@kernel.org Subject: [PATCH v8 03/20] PM / devfreq: Add devfreq_get_devfreq_by_phandle() Date: Fri, 08 Apr 2016 13:24:52 +0900 Message-id: <1460089509-16260-4-git-send-email-cw00.choi@samsung.com> X-Mailer: git-send-email 1.8.0 In-reply-to: <1460089509-16260-1-git-send-email-cw00.choi@samsung.com> References: <1460089509-16260-1-git-send-email-cw00.choi@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrAIsWRmVeSWpSXmKPExsWyRsSkWHeFEXu4wenXXBbXvzxntZh/5Byr Rf+bhawW516tZLSYdH8Ci8XrF4YW/Y9fM1ucbXrDbrHp8TVWi8u75rBZfO49wmgx4/w+Jot1 G2+xW9y+zGvx8sgPRoul1y8yWdxuXMFmMWH6WhaLM6cvsVq07j3CbtG2+gOrg6jHmnlrGD1a mnvYPC739TJ53LpT77Fz1l12j5XLv7B5bFrVyeaxeUm9x79j7B5brrazePRtWcXo8XmTXABP FJdNSmpOZllqkb5dAlfG1X23WAouSVbcmzWFsYHxqGgXIweHhICJROs67S5GTiBTTOLCvfVs XYxcHEICKxglnk5/zQqRMJHomLuAESIxi1Gi//52FgjnC6PEl4MX2ECq2AS0JPa/uAFmiwik SDx+eBJsFLPAEWaJqRtvMIEkhAV8JN5s+QBWxCKgKnFo3gtmEJtXwFVi8pPDLBDr5CQ+7HnE DmJzCrhJTL4yCaxGCKjmxubpzCBDJQS2cEjcn3yIGWKQgMS3yYdYIP6Rldh0gBlijqTEwRU3 WCYwCi9gZFjFKJpakFxQnJReZKRXnJhbXJqXrpecn7uJERixp/8969vBePOA9SFGAQ5GJR7e C+/ZwoVYE8uKK3MPMZoCbZjILCWanA9MC3kl8YbGZkYWpiamxkbmlmZK4rwJUj+DhQTSE0tS s1NTC1KL4otKc1KLDzEycXBKNTAGHjd+XNH+omeS/oJTh5IfxB3Y3uQow79sDz/L0QXyrMI6 i07zeR548+VvwU9/NbXazJt/ckQ7j7hta+mq/OEkyldluStmtyZPqv5uGd1KLmW5wMysmWql VbH5rS8NOg4seXpnzodjnPwv8xwM4g/eSvpb/1lh3lS3J9WNSc1cB3ex3Nx+SESJpTgj0VCL uag4EQAD78by0wIAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjleLIzCtJLcpLzFFi42I5/e+xoO4KI/Zwg7+nmS2uf3nOajH/yDlW i/43C1ktzr1ayWgx6f4EFovXLwwt+h+/ZrY42/SG3WLT42usFpd3zWGz+Nx7hNFixvl9TBbr Nt5it7h9mdfi5ZEfjBZLr19ksrjduILNYsL0tSwWZ05fYrVo3XuE3aJt9QdWB1GPNfPWMHq0 NPeweVzu62XyuHWn3mPnrLvsHiuXf2Hz2LSqk81j85J6j3/H2D22XG1n8ejbsorR4/MmuQCe qAZGm4zUxJTUIoXUvOT8lMy8dFsl7+B453hTMwNDXUNLC3MlhbzE3FRbJRefAF23zBygX5UU yhJzSoFCAYnFxUr6dpgmhIa46VrANEbo+oYEwfUYGaCBhDWMGVf33WIpuCRZcW/WFMYGxqOi XYycHBICJhIdcxcwQthiEhfurWfrYuTiEBKYxSjRf387C4TzhVHiy8ELbCBVbAJaEvtf3ACz RQRSJB4/PAnWwSxwhFli6sYbTCAJYQEfiTdbPoAVsQioShya94IZxOYVcJWY/OQwC8Q6OYkP ex6xg9icAm4Sk69MAqsRAqq5sXk68wRG3gWMDKsYJVILkguKk9JzjfJSy/WKE3OLS/PS9ZLz czcxgtPCM+kdjId3uR9iFOBgVOLhvfCeLVyINbGsuDL3EKMEB7OSCK+rPnu4EG9KYmVValF+ fFFpTmrxIUZToMMmMkuJJucDU1ZeSbyhsYmZkaWRuaGFkbG5kjjv4//rwoQE0hNLUrNTUwtS i2D6mDg4pRoY205vvOZvcKP8enTTs6X3zqw0e3MhsynwXPSPzb/bpySyiawUTL7t8TD07KQb OskfpT7Mula990/NlU3ZB6yCF79Wnr5HcEWUs26g/8evP6LTlu4O3tAQ+MhUjYlTacHE5in7 Vkf/+Ljlxpf2DPW8r3H/Z4aKJ2m7yLK/7ne8xbQv8P7Zi40lekosxRmJhlrMRcWJAA7E8dch AwAA 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-20160407_212539_262285_D7963128 X-CRM114-Status: GOOD ( 14.55 ) 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=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 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 --- 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;