From patchwork Fri Nov 28 10:38:35 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ulf Hansson X-Patchwork-Id: 5402741 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 5F60ABEEA8 for ; Fri, 28 Nov 2014 10:41:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6B03D2012B for ; Fri, 28 Nov 2014 10:41:06 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5D71C2010C for ; Fri, 28 Nov 2014 10:41:05 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XuIxE-0001cM-Nc; Fri, 28 Nov 2014 10:39:12 +0000 Received: from mail-la0-f45.google.com ([209.85.215.45]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XuIxA-0001JD-AD for linux-arm-kernel@lists.infradead.org; Fri, 28 Nov 2014 10:39:09 +0000 Received: by mail-la0-f45.google.com with SMTP id gq15so5504414lab.18 for ; Fri, 28 Nov 2014 02:38:45 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=eEhCbPpU513j1vY6HzuB0q9JgUy601aibizI/OcfdVs=; b=fvLX+VH255stIuRov4XQEDmoctW85v9zsasuKWiqnjKKgPdk4vFfFpoSMMJoHT2KyC ikDOmmIMZ9/cXckYRwu2LJlhRyjH59TMXWrIDs761w8qnXd3wYywodmLfi129C5duhys T3FBmMMiLrEvyd5oocBC08PL3Lf7EWrz96dX9aduDn3ET2lrE7EldXkpZvbhDWaken6V dkhHqzsbZHQmZFUDfPkGhKkmDbUyLib4v91OltOTHr4+QLsj+1Ixd1ghiHlLUG9zA6pR 8gY+vv5I2jct36m1bNTB0ly5gDcw3HpQMnAy+ifTT87TpZHr6wcdGsqcew/Lo/EzUnw2 0hkw== X-Gm-Message-State: ALoCoQnAm8EGuVBrijsG5aKyYyyJPJIiwBXjYB3v+8x+oOMrANgGt1u2lQw5ebZ9ntUPYIslcLVn X-Received: by 10.152.3.229 with SMTP id f5mr42162853laf.94.1417171125260; Fri, 28 Nov 2014 02:38:45 -0800 (PST) Received: from uffe-Latitude-E6430s.lan (90-231-160-185-no158.tbcn.telia.com. [90.231.160.185]) by mx.google.com with ESMTPSA id n6sm2498806laj.16.2014.11.28.02.38.42 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 28 Nov 2014 02:38:44 -0800 (PST) From: Ulf Hansson To: "Rafael J. Wysocki" , Len Brown , Pavel Machek , Kevin Hilman , linux-pm@vger.kernel.org Subject: [PATCH V2] PM / Domains: Add pm_genpd_lookup() API to lookup domain by firmware node Date: Fri, 28 Nov 2014 11:38:35 +0100 Message-Id: <1417171115-5789-1-git-send-email-ulf.hansson@linaro.org> X-Mailer: git-send-email 1.9.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20141128_023908_566159_08AF587B X-CRM114-Status: GOOD ( 14.97 ) X-Spam-Score: -0.7 (/) Cc: Ulf Hansson , linux-samsung-soc@vger.kernel.org, Geert Uytterhoeven , Dmitry Torokhov , Amit Daniel Kachhap , Sylwester Nawrocki , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_LOW, T_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 In a step to move away from using genpd's name based APIs, such as the pm_genpd_add_subdomain_names(), provide an API to lookup an already initialized generic PM domain by its firmware node. This API would typically be a called from SOC specific code, to fetch a handle to the domain. Especially convenient to configure subdomains and when the hierarchy of the domains are described in DT. Do note, before pm_genpd_init() is invoked to initialize a generic PM domain, it's the callers responsibility to assign the new ->fwnode pointer in the struct generic_pm_domain, to enable pm_genpd_lookup() to find the domain. Signed-off-by: Ulf Hansson --- Changes in v2: Change from using struct device_node to struct fwnode_handle. Updated commit header accordingly. --- drivers/base/power/domain.c | 27 +++++++++++++++++++++++++++ include/linux/pm_domain.h | 4 ++++ 2 files changed, 31 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 735c473..2d881d5 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -75,6 +75,33 @@ struct generic_pm_domain *dev_to_genpd(struct device *dev) return pd_to_genpd(dev->pm_domain); } +/** + * pm_genpd_lookup - Fetch a generic PM domain object by firmware node. + * @node: Firmware node to a corresponding genpd. + * + * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() + * on failure. + */ +struct generic_pm_domain *pm_genpd_lookup(struct fwnode_handle *node) +{ + struct generic_pm_domain *genpd = ERR_PTR(-ENOENT), *gpd; + + if (IS_ERR_OR_NULL(node)) + return ERR_PTR(-EINVAL); + + mutex_lock(&gpd_list_lock); + list_for_each_entry(gpd, &gpd_list, gpd_list_node) { + if (gpd->fwnode == node) { + genpd = gpd; + break; + } + } + mutex_unlock(&gpd_list_lock); + + return genpd; +} +EXPORT_SYMBOL_GPL(pm_genpd_lookup); + static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) { return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 8cbd32e..aa01050 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -43,6 +43,8 @@ struct gpd_cpuidle_data { struct cpuidle_state *idle_state; }; +struct fwnode_handle; + struct generic_pm_domain { struct dev_pm_domain domain; /* PM domain operations */ struct list_head gpd_list_node; /* Node in the global PM domains list */ @@ -53,6 +55,7 @@ struct generic_pm_domain { struct dev_power_governor *gov; struct work_struct power_off_work; const char *name; + struct fwnode_handle *fwnode; /* Firware node for the PM domain */ unsigned int in_progress; /* Number of devices being suspended now */ atomic_t sd_count; /* Number of subdomains with power "on" */ enum gpd_status status; /* Current state of the domain */ @@ -126,6 +129,7 @@ static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) } extern struct generic_pm_domain *dev_to_genpd(struct device *dev); +extern struct generic_pm_domain *pm_genpd_lookup(struct fwnode_handle *node); extern int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, struct gpd_timing_data *td);