From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Grandegger Subject: Re: [PATCH v3 5/5] powerpc/85xx: i2c-mpc: use new I2C bindings for the Socates board Date: Wed, 08 Apr 2009 09:16:29 +0200 Message-ID: <49DC4F4D.10803@grandegger.com> References: <20090407082052.477328750@denx.de> <20090407082231.803193635@denx.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linuxppc-dev-bounces+glppe-linuxppc-embedded-2=m.gmane.org@ozlabs.org Errors-To: linuxppc-dev-bounces+glppe-linuxppc-embedded-2=m.gmane.org@ozlabs.org To: Grant Likely Cc: linuxppc-dev@ozlabs.org, devicetree-discuss@ozlabs.org, linux-i2c@vger.kernel.org, Ben Dooks List-Id: linux-i2c@vger.kernel.org Grant Likely wrote: > On Tue, Apr 7, 2009 at 1:20 AM, Wolfgang Grandegger wrote: >> Preserve I2C clock settings for the Socrates MPC8544 board. > > I had thought that the preserve-clocking property was intended for > older boards that don't currently have any method of getting the clock > setting out of u-boot. Since Socrates is a new board, U-Boot should > probably be made to fill in the real clock rate setting. I'm not sure if I understand what you mean. If an old version of U-Boot on an old board sets the I2C clock, it can be used (inherited) by Linux using the property "preserve-clocking". It is actually the customers choice to set the I2C clock in U-Boot and re-use it by Linux. Wolfgang.