From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755553AbZBTIg3 (ORCPT ); Fri, 20 Feb 2009 03:36:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756018AbZBTIgP (ORCPT ); Fri, 20 Feb 2009 03:36:15 -0500 Received: from zone0.gcu-squad.org ([212.85.147.21]:38619 "EHLO services.gcu-squad.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754141AbZBTIgO (ORCPT ); Fri, 20 Feb 2009 03:36:14 -0500 Date: Fri, 20 Feb 2009 09:36:00 +0100 From: Jean Delvare To: Sasa Sasa Cc: linux-kernel@vger.kernel.org, linux-arm@vger.kernel.org, marc.pignat@hevs.ch, Linux I2C Subject: Re: I2C query regarding baud rate Message-ID: <20090220093600.367e85f6@hyperion.delvare> In-Reply-To: References: X-Mailer: Claws Mail 3.5.0 (GTK+ 2.14.4; x86_64-suse-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Please direct I2C-related questions to the i2c-linux mailing list (now Cc'd.) On Fri, 20 Feb 2009 11:39:57 +0530, Sasa Sasa wrote: > I have a query regarding the baud rate of I2C controller. Our I2C > controller supports 3 different baud rates. So is there any possible > or standard way for I2C clients to set this baud rate on I2C adaptor > dynamically? No, we do not have any way to do this at the moment. But I2C bus speed is a tricky affair to start with. Not taking HS-I2C into account for a moment, the I2C bus speed is a bus-wide setting, not a per-chip setting, so letting each I2C chip driver change the bus speed doesn't make sense. The I2C bus speed must be set once and for all according to which devices are present on the bus (which is something only the system designer knows.) -- Jean Delvare