From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752519AbaKZMZh (ORCPT ); Wed, 26 Nov 2014 07:25:37 -0500 Received: from mail-la0-f41.google.com ([209.85.215.41]:39053 "EHLO mail-la0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750770AbaKZMZf convert rfc822-to-8bit (ORCPT ); Wed, 26 Nov 2014 07:25:35 -0500 Content-Type: text/plain; charset=koi8-r Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Subject: Re: [PATCH 2/3] i2c: slave-eeprom: add eeprom simulator driver From: Alexander Kochetkov In-Reply-To: <20141122181229.GB9698@katana> Date: Wed, 26 Nov 2014 15:25:29 +0300 Cc: Stijn Devriendt , linux-i2c@vger.kernel.org, linux-sh@vger.kernel.org, Magnus Damm , Simon Horman , Laurent Pinchart , Geert Uytterhoeven , LKML , linux-arm-kernel@lists.infradead.org, Jean Delvare Content-Transfer-Encoding: 8BIT Message-Id: <2A7C987F-15E0-46FD-A711-E7F5BA9893FC@gmail.com> References: <1416326695-13083-1-git-send-email-wsa@the-dreams.de> <1416326695-13083-3-git-send-email-wsa@the-dreams.de> <20141122181229.GB9698@katana> To: Wolfram Sang X-Mailer: Apple Mail (2.1878.6) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 22 ΞΟΡΒ. 2014 Η., Χ 21:12, Wolfram Sang ΞΑΠΙΣΑΜ(Α): > IMO a repeated start is to ensure that two messages arrive at the slave > without interruption from another master. I can't think why a slave > should know which type of start that was. In fact, if it does that would > raise an eyebrow for me. Do you have an example? It is used to implement Device ID reading. Not sure, that the feature is really needed for the first release. See [1] "3.1.17 Device ID" chapter on page "20 of 64" See [2] "7.2.2 Device ID (PCA9671 ID field)" chapter [1] UM10204 I2C-bus specification and user manual (http://www.nxp.com/documents/user_manual/UM10204.pdf) [2] PCA9671 (http://www.nxp.com/documents/data_sheet/PCA9671.pdf) Alexander.