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[209.132.180.67]) by mx.google.com with ESMTP id d10-v6si2714907pgo.630.2018.06.26.23.03.16; Tue, 26 Jun 2018 23:03:30 -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; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753230AbeF0FrD (ORCPT + 99 others); Wed, 27 Jun 2018 01:47:03 -0400 Received: from mga02.intel.com ([134.134.136.20]:36289 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750986AbeF0FrA (ORCPT ); Wed, 27 Jun 2018 01:47:00 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jun 2018 22:47:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,277,1526367600"; d="scan'208";a="211496385" Received: from shawn-bm6650-bm6350.itwn.intel.com ([10.5.253.27]) by orsmga004.jf.intel.com with ESMTP; 26 Jun 2018 22:46:56 -0700 From: alanx.chiang@intel.com To: linux-i2c@vger.kernel.org Cc: andy.yeh@intel.com, sakari.ailus@linux.intel.com, andriy.shevchenko@linux.intel.com, andriy.shevchenko@intel.com, rajmohan.mani@intel.com, andy.shevchenko@gmail.com, tfiga@chromium.org, jcliang@chromium.org, brgl@bgdev.pl, robh+dt@kernel.org, mark.rutland@arm.com, arnd@arndb.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Alan Chiang Subject: [PATCH v3 2/2] eeprom: at24: Add support for address-width property Date: Wed, 27 Jun 2018 13:46:25 +0800 Message-Id: <1530078385-1546-3-git-send-email-alanx.chiang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530078385-1546-1-git-send-email-alanx.chiang@intel.com> References: <1530078385-1546-1-git-send-email-alanx.chiang@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alan Chiang Provide a flexible way to determine the addressing bits of eeprom. Pass the addressing bits to driver through address-width property. Signed-off-by: Alan Chiang Signed-off-by: Andy Yeh --- since v1 -- Add a warn message for 8-bit addressing. since v2 -- Modify the warning message for clear. -- Move the clearing bit operation outside of a statement. --- drivers/misc/eeprom/at24.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 0c125f2..d606f3b 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -478,6 +478,24 @@ static void at24_properties_to_pdata(struct device *dev, if (device_property_present(dev, "no-read-rollover")) chip->flags |= AT24_FLAG_NO_RDROL; + err = device_property_read_u32(dev, "address-width", &val); + if (!err) { + switch (val) { + case 8: + if (chip->flags & AT24_FLAG_ADDR16) + dev_warn(dev, "Override address width to be 8," + "while default is 16\n"); + chip->flags &= ~AT24_FLAG_ADDR16; + break; + case 16: + chip->flags |= AT24_FLAG_ADDR16; + break; + default: + dev_warn(dev, "Bad \"address-width\" property: %u\n", + val); + } + } + err = device_property_read_u32(dev, "size", &val); if (!err) chip->byte_len = val; -- 2.7.4