From patchwork Mon Feb 10 10:03:56 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 3617211 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 4D6439F39B for ; Mon, 10 Feb 2014 10:05:47 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 714BE20155 for ; Mon, 10 Feb 2014 10:05:46 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (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 82A5120173 for ; Mon, 10 Feb 2014 10:05:45 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WCnjo-0002LL-IC; Mon, 10 Feb 2014 10:05:16 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WCnjf-0005b3-AD; Mon, 10 Feb 2014 10:05:07 +0000 Received: from sauhun.de ([89.238.76.85] helo=pokefinder.org) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WCnjO-0005XD-7M for linux-arm-kernel@lists.infradead.org; Mon, 10 Feb 2014 10:04:52 +0000 Received: from p4fe245fb.dip0.t-ipconnect.de ([79.226.69.251]:57333 helo=localhost) by pokefinder.org with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.69) (envelope-from ) id 1WCniz-000814-Vg; Mon, 10 Feb 2014 11:04:26 +0100 From: Wolfram Sang To: linux-i2c@vger.kernel.org Subject: [PATCH 02/17] i2c: add deprecation warning for class based instantiation Date: Mon, 10 Feb 2014 11:03:56 +0100 Message-Id: <1392026654-5343-3-git-send-email-wsa@the-dreams.de> X-Mailer: git-send-email 1.8.5.1 In-Reply-To: <1392026654-5343-1-git-send-email-wsa@the-dreams.de> References: <1392026654-5343-1-git-send-email-wsa@the-dreams.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140210_050450_403977_D5938EC8 X-CRM114-Status: GOOD ( 11.09 ) X-Spam-Score: -1.9 (-) Cc: Jean Delvare , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Wolfram Sang X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 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=-4.8 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 Class based instantiation can cause noticeable delays when booting. This mechanism is used when it is not possible to describe slaves on I2C busses. As we do have other mechanisms, most embedded I2C will not need classes and for embedded it is explicitly not recommended to use them. Add a deprecation warning for drivers which want to disable class based instantiation in the near future to gain boot-up time, so users relying on this technique can switch to something better. They really should. Signed-off-by: Wolfram Sang Cc: Jean Delvare Cc: linux-arm-kernel@lists.infradead.org --- drivers/i2c/i2c-core.c | 7 +++++++ include/linux/i2c.h | 1 + 2 files changed, 8 insertions(+) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index d74c0b3..42fcc59 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -1935,6 +1935,13 @@ static int i2c_detect_address(struct i2c_client *temp_client, struct i2c_client *client; /* Detection succeeded, instantiate the device */ + if (adapter->class & I2C_CLASS_DEPRECATED) + dev_warn(&adapter->dev, + "This adapter will soon drop class based instantiation of devices. " + "Please make sure client 0x%02x gets instantiated by other means. " + "Check 'Documentation/i2c/instantiating-devices' for details.\n", + info.addr); + dev_dbg(&adapter->dev, "Creating %s at 0x%02x\n", info.type, info.addr); client = i2c_new_device(adapter, &info); diff --git a/include/linux/i2c.h b/include/linux/i2c.h index d9c8dbd3..b9e1707 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -473,6 +473,7 @@ void i2c_unlock_adapter(struct i2c_adapter *); #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ #define I2C_CLASS_SPD (1<<7) /* Memory modules */ +#define I2C_CLASS_DEPRECATED (1<<8) /* Warn users that adapter will stop using classes */ /* Internal numbers to terminate lists */ #define I2C_CLIENT_END 0xfffeU