From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from rv-out-0506.google.com (rv-out-0506.google.com [209.85.198.238]) by ozlabs.org (Postfix) with ESMTP id 7F1A9DE112 for ; Thu, 23 Apr 2009 23:53:27 +1000 (EST) Received: by rv-out-0506.google.com with SMTP id f9so448830rvb.9 for ; Thu, 23 Apr 2009 06:53:26 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <282847E1-AE1A-44EF-9D18-AF2884105FA5@kernel.crashing.org> References: <49EF7B11.2000006@freescale.com> <49EF7B1C.2080105@freescale.com> <282847E1-AE1A-44EF-9D18-AF2884105FA5@kernel.crashing.org> From: Grant Likely Date: Thu, 23 Apr 2009 07:53:11 -0600 Message-ID: Subject: Re: removing get_immrbase()?? To: Kumar Gala Content-Type: text/plain; charset=ISO-8859-1 Cc: Scott Wood , Linuxppc-dev Development , Timur Tabi List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, Apr 22, 2009 at 3:31 PM, Kumar Gala wro= te: > > On Apr 22, 2009, at 3:16 PM, Timur Tabi wrote: > >> Scott Wood wrote: >>> >>> Timur Tabi wrote: >>>>> >>>>> =A0 =A0 =A0these two are related and seem like we could look for "fsl= ,cpm2" >>>> >>>> That's okay, as long as you don't break compatibility with older >>>> device trees that don't have that property, unless you can demonstrate >>>> that these trees would never work with the current kernel anyway. >>> >>> All CPM2 device trees should have fsl,cpm2 listed in the compatible of >>> the CPM node. >> >> Yes, but did they always have that compatible field? =A0I'm concerned >> about situations where someone updates his kernel but not his device >> tree. =A0This is a scenerio that we always need to try to support. > > I disagree. =A0If you update your kernel you should update your device tr= ee > (thus we have .dts in the kernel tree and not somewhere else). Not always possible. The device tree may be 'softer' than firmware, and easier to update, but it is still firmer than the kernel. That is why so much effort has been spent to not break compatibility with older device trees. g. --=20 Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd.