From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9AFFBC32771 for ; Thu, 9 Jan 2020 09:47:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 783B52072E for ; Thu, 9 Jan 2020 09:47:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729803AbgAIJri (ORCPT ); Thu, 9 Jan 2020 04:47:38 -0500 Received: from foss.arm.com ([217.140.110.172]:55898 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728755AbgAIJrh (ORCPT ); Thu, 9 Jan 2020 04:47:37 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CB55D31B; Thu, 9 Jan 2020 01:47:36 -0800 (PST) Received: from [10.37.12.111] (unknown [10.37.12.111]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 399463F6C4; Thu, 9 Jan 2020 01:47:33 -0800 (PST) Subject: Re: [PATCH v2 01/11] PM / devfreq: Add devfreq_get_devfreq_by_node function To: Chanwoo Choi , robh+dt@kernel.org, krzk@kernel.org, heiko@sntech.de, leonard.crestez@nxp.com Cc: mark.rutland@arm.com, a.swigon@samsung.com, m.szyprowski@samsung.com, kgene@kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com, linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org References: <20191220002430.11995-1-cw00.choi@samsung.com> <20191220002430.11995-2-cw00.choi@samsung.com> From: Lukasz Luba Message-ID: <71da0ef9-1e72-dddc-dcb4-e4cb28b67183@arm.com> Date: Thu, 9 Jan 2020 09:47:31 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20191220002430.11995-2-cw00.choi@samsung.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Hi Chanwoo, On 12/20/19 12:24 AM, Chanwoo Choi wrote: > From: Leonard Crestez > > Split off part of devfreq_get_devfreq_by_phandle into a separate > function. This allows callers to fetch devfreq instances by enumerating > devicetree instead of explicit phandles. > > [lkp: Reported the build error] > Reported-by: kbuild test robot > Signed-off-by: Leonard Crestez > [cw00.choi: Export devfreq_get_devfreq_by_node function and > add function to devfreq.h when CONFIG_PM_DEVFREQ is enabled.] > Signed-off-by: Chanwoo Choi > --- > drivers/devfreq/devfreq.c | 46 +++++++++++++++++++++++++++++---------- > include/linux/devfreq.h | 6 +++++ > 2 files changed, 41 insertions(+), 11 deletions(-) > > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > index 89260b17598f..cb8ca81c8973 100644 > --- a/drivers/devfreq/devfreq.c > +++ b/drivers/devfreq/devfreq.c > @@ -966,6 +966,32 @@ struct devfreq *devm_devfreq_add_device(struct device *dev, > EXPORT_SYMBOL(devm_devfreq_add_device); > > #ifdef CONFIG_OF > +/* > + * devfreq_get_devfreq_by_node - Get the devfreq device from devicetree > + * @node - pointer to device_node > + * > + * return the instance of devfreq device > + */ > +struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) > +{ > + struct devfreq *devfreq; > + > + if (!node) > + return ERR_PTR(-EINVAL); > + > + 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(-ENODEV); > +} > + > /* > * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree > * @dev - instance to the given device > @@ -988,26 +1014,24 @@ struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int 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); > - of_node_put(node); > - return devfreq; > - } > - } > - mutex_unlock(&devfreq_list_lock); > + devfreq = devfreq_get_devfreq_by_node(node); > of_node_put(node); > > - return ERR_PTR(-EPROBE_DEFER); > + return devfreq; > } > + > #else > +struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) > +{ > + return ERR_PTR(-ENODEV); > +} > + > 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_node); > EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); > > /** > diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h > index c6f82d4bec9f..1dccc47acbce 100644 > --- a/include/linux/devfreq.h > +++ b/include/linux/devfreq.h > @@ -253,6 +253,7 @@ extern void devm_devfreq_unregister_notifier(struct device *dev, > struct devfreq *devfreq, > struct notifier_block *nb, > unsigned int list); > +extern struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node); It can go without 'extern' in the header. > extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, > int index); > > @@ -407,6 +408,11 @@ static inline void devm_devfreq_unregister_notifier(struct device *dev, > { > } > > +static inline struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) > +{ > + return ERR_PTR(-ENODEV); > +} > + > static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, > int index) > { > Apart from this minor thing, looks good to me. When you fix it, feel free to add Reviewed-by: Lukasz Luba Regards, Lukasz