From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932139AbbBLEBl (ORCPT ); Wed, 11 Feb 2015 23:01:41 -0500 Received: from bh-25.webhostbox.net ([208.91.199.152]:47334 "EHLO bh-25.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754693AbbBLEBk (ORCPT ); Wed, 11 Feb 2015 23:01:40 -0500 Date: Wed, 11 Feb 2015 20:01:26 -0800 From: Guenter Roeck To: Wolfram Sang Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] eeprom: at24: Add support for large EEPROMs connected to SMBus adapters Message-ID: <20150212040126.GA1691@roeck-us.net> References: <1423067017-27607-1-git-send-email-linux@roeck-us.net> <20150204174723.GB30930@katana> <20150204190819.GA15467@roeck-us.net> <20150204233516.GA1677@katana> <20150205002630.GA396@roeck-us.net> <20150205144028.GA4865@katana> <20150205175326.GA26691@roeck-us.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150205175326.GA26691@roeck-us.net> User-Agent: Mutt/1.5.23 (2014-03-12) X-Authenticated_sender: guenter@roeck-us.net X-OutGoing-Spam-Status: No, score=-1.0 X-CTCH-PVer: 0000001 X-CTCH-Spam: Unknown X-CTCH-VOD: Unknown X-CTCH-Flags: 0 X-CTCH-RefID: str=0001.0A020204.54DC25A3.01AB,ss=1,re=0.001,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0 X-CTCH-Score: 0.001 X-CTCH-ScoreCust: 0.000 X-CTCH-Rules: C_4847, X-CTCH-SenderID: linux@roeck-us.net X-CTCH-SenderID-Flags: 0 X-CTCH-SenderID-TotalMessages: 3 X-CTCH-SenderID-TotalSpam: 0 X-CTCH-SenderID-TotalSuspected: 0 X-CTCH-SenderID-TotalConfirmed: 0 X-CTCH-SenderID-TotalBulk: 0 X-CTCH-SenderID-TotalVirus: 0 X-CTCH-SenderID-TotalRecipients: 0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - bh-25.webhostbox.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - roeck-us.net X-Get-Message-Sender-Via: bh-25.webhostbox.net: mailgid no entry from get_relayhosts_entry X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 05, 2015 at 09:53:26AM -0800, Guenter Roeck wrote: > On Thu, Feb 05, 2015 at 03:40:28PM +0100, Wolfram Sang wrote: > > > > > At the same time multi-master access is quite rare. > > > > > > > > It should still work in those rare cases. A setup of an SoC, an EC > > > > (those like to be masters, as well), and an EEPROM is not very far off. > > > > To clarify: What I meant here is, at24 should also work in those rare > > cases reliably (like the described case of SoC, EC and EEPROM). Your > > patch sacrificies this reliability. > > > But it won't, and it can't. 24c32 should simply not be used in such cases. > Besides, at least on PCs, ACPI should reserve and thus block SMBus access > if it is used by an EC (or IPMI or similar). > > I don't think it should (or even can) be the Linux kernel's responsibility > to ensure that the hardware does not prevent such problems. > Hi Wolfram, I wonder where we are with thisp patch; I don't recall a reply to my previous e-mail. Do you need some more time to think about it ? Otherwise I'll publish an out-of-tree version of the at24 driver with the patch applied on github, for those who might need the functionality provided by this patch. Please let me know. Thanks, Guenter