From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: Re: [RFC PATCH] Documentation: devicetree: add description for generic bus properties Date: Fri, 29 Nov 2013 10:11:23 -0800 Message-ID: <20131129181123.GA7113@kroah.com> References: <20131127172806.GC2291@e103592.cambridge.arm.com> <20131127230650.GA6162@kroah.com> <20131128102845.GB21354@mudshark.cambridge.arm.com> <20131128173339.GB4634@e103592.cambridge.arm.com> <20131128191331.GB2385@kroah.com> <20131128193917.GC4634@e103592.cambridge.arm.com> <20131128212528.GA6144@kroah.com> <20131129114453.GC21336@mudshark.cambridge.arm.com> <20131129173701.GA5635@kroah.com> <20131129180110.GJ31000@mudshark.cambridge.arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20131129180110.GJ31000-MRww78TxoiP5vMa5CHWGZ34zcgK1vI+I0E9HWUfgJXw@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Will Deacon Cc: Dave P Martin , Mark Rutland , "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Stephen Warren , Thierry Reding , "grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org" , "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , Hiroshi Doyu List-Id: devicetree@vger.kernel.org On Fri, Nov 29, 2013 at 06:01:10PM +0000, Will Deacon wrote: > On Fri, Nov 29, 2013 at 05:37:01PM +0000, Greg KH wrote: > > On Fri, Nov 29, 2013 at 11:44:53AM +0000, Will Deacon wrote: > > > On Thu, Nov 28, 2013 at 09:25:28PM +0000, Greg KH wrote: > > > > On Thu, Nov 28, 2013 at 07:39:17PM +0000, Dave Martin wrote: > > > > > On Thu, Nov 28, 2013 at 11:13:31AM -0800, Greg KH wrote: > > > > > > Yes it is, you all are the ones tasked with implementing the crazy crap > > > > > > the hardware people have created, best of luck with that :) > > > > > > > > > > Agreed. The first assumption should be that we can fit in with the > > > > > existing device model -- we should only reconsider if we find that > > > > > to be impossible. > > > > > > > > Let me know if you think it is somehow impossible, but you all should > > > > really push back on the insane hardware designers that are forcing you > > > > all to do this work. I find it "interesting" how this all becomes your > > > > workload for their crazy ideas. > > > > > > Oh, I don't think we're claiming anything is impossible here :) It's more > > > that we will probably want to make some changes to the device model to allow, > > > for example, a device to be associated with multiple buses of potentially > > > different types. > > > > Why would you want that? What good would that help with? > > It would help with devices which have their slave interface on one bus, but > master to another. > > We need a way to configure the master side of things (IOMMU, coherency, MSI > routing, etc) on one bus and configure the slave side (device probing, power > management, clocks, etc) on another. Make this two "devices" and have each "device" have a pointer or a way to "find" the other one. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html