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: 9309135 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A85DE607D6 for ; Thu, 1 Sep 2016 14:08:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 72A1229436 for ; Thu, 1 Sep 2016 14:08:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 672B629438; Thu, 1 Sep 2016 14:08:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 070F529436 for ; Thu, 1 Sep 2016 14:08:48 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bfSd7-0002sH-1A; Thu, 01 Sep 2016 14:06:09 +0000 Received: from down.free-electrons.com ([37.187.137.238] helo=mail.free-electrons.com) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bfScz-0002mK-PX for linux-arm-kernel@lists.infradead.org; Thu, 01 Sep 2016 14:06:05 +0000 Received: by mail.free-electrons.com (Postfix, from userid 110) id 15E251BC9; Thu, 1 Sep 2016 16:05:40 +0200 (CEST) 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 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> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160901_070602_055301_9A4B7875 X-CRM114-Status: GOOD ( 10.44 ) 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: thomas.petazzoni@free-electrons.com, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, antoine.tenart@free-electrons.com, linux-kernel@vger.kernel.org, Quentin Schulz , 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-Virus-Scanned: ClamAV using ClamSMTP 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(-) 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");