From patchwork Fri Aug 5 06:00:33 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shubhrajyoti Datta X-Patchwork-Id: 1037462 Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p75613eD027274 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 5 Aug 2011 06:01:24 GMT Received: from canuck.infradead.org ([2001:4978:20e::1]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QpDSp-0001XP-0A; Fri, 05 Aug 2011 06:00:55 +0000 Received: from localhost ([127.0.0.1] helo=canuck.infradead.org) by canuck.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1QpDSo-0000PH-GT; Fri, 05 Aug 2011 06:00:54 +0000 Received: from arroyo.ext.ti.com ([192.94.94.40]) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QpDSl-0000OZ-Dm for linux-arm-kernel@lists.infradead.org; Fri, 05 Aug 2011 06:00:52 +0000 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id p7560kFP029317 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 5 Aug 2011 01:00:48 -0500 Received: from dbde70.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id p7560ibr023523; Fri, 5 Aug 2011 11:30:45 +0530 (IST) Received: from dbdp31.itg.ti.com (172.24.170.98) by DBDE70.ent.ti.com (172.24.170.148) with Microsoft SMTP Server id 8.3.106.1; Fri, 5 Aug 2011 11:30:45 +0530 Received: from a0393217ubnlt.india.ti.com ([172.24.190.88]) by dbdp31.itg.ti.com (8.13.8/8.13.8) with ESMTP id p7560fUs019038; Fri, 5 Aug 2011 11:30:43 +0530 (IST) From: Shubhrajyoti D To: Subject: [PATCHv6 1/3] OMAP: I2C: Reset support Date: Fri, 5 Aug 2011 11:30:33 +0530 Message-ID: <1312524035-5549-1-git-send-email-shubhrajyoti@ti.com> X-Mailer: git-send-email 1.7.1 MIME-Version: 1.0 X-CRM114-Version: 20090807-BlameThorstenAndJenny ( TRE 0.7.6 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20110805_020051_594389_3BF7A094 X-CRM114-Status: GOOD ( 14.64 ) X-Spam-Score: -3.1 (---) X-Spam-Report: SpamAssassin version 3.3.1 on canuck.infradead.org summary: Content analysis details: (-3.1 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [192.94.94.40 listed in list.dnswl.org] -0.8 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain Cc: khilman@ti.com, balajitk@ti.com, rnayak@ti.com, santosh.shilimkar@ti.com, linux-i2c@vger.kernel.org, Shubhrajyoti D , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Fri, 05 Aug 2011 06:01:24 +0000 (UTC) Under some error conditions the i2c driver may do a reset. Adding a reset field and support in the device-specific code. Signed-off-by: Shubhrajyoti D --- arch/arm/plat-omap/i2c.c | 18 ++++++++++++++++++ include/linux/i2c-omap.h | 1 + 2 files changed, 19 insertions(+), 0 deletions(-) diff --git a/arch/arm/plat-omap/i2c.c b/arch/arm/plat-omap/i2c.c index 2388b8e..be36cac 100644 --- a/arch/arm/plat-omap/i2c.c +++ b/arch/arm/plat-omap/i2c.c @@ -146,6 +146,22 @@ static struct omap_device_pm_latency omap_i2c_latency[] = { .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST, }, }; +/** + * omap2_i2c_reset - reset the omap i2c module. + * @dev: struct device* + */ + +static int omap2_i2c_reset(struct device *dev) +{ + int r = 0; + struct platform_device *pdev = to_platform_device(dev); + struct omap_device *odev = to_omap_device(pdev); + struct omap_hwmod *oh; + + oh = odev->hwmods[0]; + r = omap_hwmod_reset(oh); + return r; +} static inline int omap2_i2c_add_bus(int bus_id) { @@ -187,6 +203,8 @@ static inline int omap2_i2c_add_bus(int bus_id) */ if (cpu_is_omap34xx()) pdata->set_mpu_wkup_lat = omap_pm_set_max_mpu_wakeup_lat_compat; + + pdata->device_reset = omap2_i2c_reset; od = omap_device_build(name, bus_id, oh, pdata, sizeof(struct omap_i2c_bus_platform_data), omap_i2c_latency, ARRAY_SIZE(omap_i2c_latency), 0); diff --git a/include/linux/i2c-omap.h b/include/linux/i2c-omap.h index 98ae49b..8aa91b6 100644 --- a/include/linux/i2c-omap.h +++ b/include/linux/i2c-omap.h @@ -38,6 +38,7 @@ struct omap_i2c_bus_platform_data { int (*device_enable) (struct platform_device *pdev); int (*device_shutdown) (struct platform_device *pdev); int (*device_idle) (struct platform_device *pdev); + int (*device_reset) (struct device *dev); }; #endif