From patchwork Thu Sep 1 14:05:03 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Quentin Schulz X-Patchwork-Id: 75221 Delivered-To: patch@linaro.org Received: by 10.140.29.8 with SMTP id a8csp317618qga; Thu, 1 Sep 2016 07:05:49 -0700 (PDT) X-Received: by 10.98.80.220 with SMTP id g89mr27045882pfj.12.1472738749526; Thu, 01 Sep 2016 07:05:49 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id ln2si5849546pab.23.2016.09.01.07.05.49; Thu, 01 Sep 2016 07:05:49 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933795AbcIAOFp (ORCPT + 27 others); Thu, 1 Sep 2016 10:05:45 -0400 Received: from down.free-electrons.com ([37.187.137.238]:46507 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752185AbcIAOFm (ORCPT ); Thu, 1 Sep 2016 10:05:42 -0400 Received: by mail.free-electrons.com (Postfix, from userid 110) id 15E251BC9; Thu, 1 Sep 2016 16:05:40 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT shortcircuit=ham autolearn=disabled version=3.4.0 Received: from quentin-Latitude-E6320.home (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.free-electrons.com (Postfix) with ESMTPSA id 9F43418AB; Thu, 1 Sep 2016 16:05:29 +0200 (CEST) From: Quentin Schulz To: jdelvare@suse.com, linux@roeck-us.net, jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, maxime.ripard@free-electrons.com, wens@csie.org, lee.jones@linaro.org Cc: Quentin Schulz , thomas.petazzoni@free-electrons.com, antoine.tenart@free-electrons.com, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 1/3] hwmon: iio_hwmon: delay probing with late_initcall Date: Thu, 1 Sep 2016 16:05:03 +0200 Message-Id: <1472738705-20145-2-git-send-email-quentin.schulz@free-electrons.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1472738705-20145-1-git-send-email-quentin.schulz@free-electrons.com> References: <1472738705-20145-1-git-send-email-quentin.schulz@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org iio_channel_get_all returns -ENODEV when it cannot find either phandles and properties in the Device Tree or channels whose consumer_dev_name matches iio_hwmon in iio_map_list. The iio_map_list is filled in by iio drivers which might be probed after iio_hwmon. This makes sure iio_hwmon is probed after all iio drivers which provides channels to iio_hwmon are probed, be they present in the DT or using iio_map_list. This replaces module_platform_driver() by an explicit code variant which calls late_initcall() install of module_init(), meaning it probes after all the drivers using module_init() as their init. Signed-off-by: Quentin Schulz --- v4: - use platform_driver_register instead of platform_register_drivers, v3: - use late_initcall instead of deferring probe, drivers/hwmon/iio_hwmon.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) -- 2.5.0 diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c index b550ba5..c509779 100644 --- a/drivers/hwmon/iio_hwmon.c +++ b/drivers/hwmon/iio_hwmon.c @@ -192,7 +192,17 @@ static struct platform_driver __refdata iio_hwmon_driver = { .remove = iio_hwmon_remove, }; -module_platform_driver(iio_hwmon_driver); +static int __init iio_hwmon_late_init(void) +{ + return platform_driver_register(&iio_hwmon_driver); +} +late_initcall(iio_hwmon_late_init); + +static void __exit iio_hwmon_exit(void) +{ + platform_driver_unregister(&iio_hwmon_driver); +} +module_exit(iio_hwmon_exit); MODULE_AUTHOR("Jonathan Cameron "); MODULE_DESCRIPTION("IIO to hwmon driver");