From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Brownell Subject: Re: [PATCH 2/3] ARM: OMAP: Use I2C bus registration helper Date: Mon, 5 Nov 2007 01:56:40 -0800 Message-ID: <200711050156.40287.david-b@pacbell.net> References: <1194011191-29395-1-git-send-email-jarkko.nikula@nokia.com> <200711020927.40350.david-b@pacbell.net> <20071105102657.f195e5c0.jarkko.nikula@nokia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20071105102657.f195e5c0.jarkko.nikula@nokia.com> Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-omap-open-source-bounces+gplao-linux-omap-open-source=gmane.org@linux.omap.com Errors-To: linux-omap-open-source-bounces+gplao-linux-omap-open-source=gmane.org@linux.omap.com To: Jarkko Nikula Cc: linux-omap-open-source@linux.omap.com List-Id: linux-omap@vger.kernel.org On Monday 05 November 2007, Jarkko Nikula wrote: > > > Is there a reason you're not using 400k anywhere? > > ISTR at one point checking specs and finding that > > many TI dev boards were spec'd so that 400k should > > work fine. > > > Reason is to not break anything :-) > > Honestly I don't believe that we have many boards with components not > rated for 400 kHz. Most components are rated like that. Unfortunately it seems the isp1301 transceiver -- for full speed USB-OTG support -- has a 100 KHz ceiling on the clock rate, so bus segments with those (found on H2, H3, H4, and surely a few others) can't use 400K. Ditto the pcf8574 I/O expanders. - Dave