From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752358Ab1IUHLg (ORCPT ); Wed, 21 Sep 2011 03:11:36 -0400 Received: from rs35.luxsci.com ([66.216.127.90]:50585 "EHLO rs35.luxsci.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750873Ab1IUHLf (ORCPT ); Wed, 21 Sep 2011 03:11:35 -0400 Message-ID: <4E798E16.6060308@firmworks.com> Date: Tue, 20 Sep 2011 21:11:18 -1000 From: Mitch Bradley User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20110902 Thunderbird/6.0.2 MIME-Version: 1.0 To: David Miller CC: grant.likely@secretlab.ca, dave.martin@linaro.org, linux@arm.linux.org.uk, devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, rob.herring@calxeda.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 0/3] GIC OF bindings References: <20110920.224910.1996429830782124690.davem@davemloft.net> <4E796EE4.6070704@firmworks.com> <20110921.012158.2252182592946972727.davem@davemloft.net> In-Reply-To: <20110921.012158.2252182592946972727.davem@davemloft.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/20/2011 7:21 PM, David Miller wrote: > From: Mitch Bradley > Date: Tue, 20 Sep 2011 18:58:12 -1000 > >> interrupt-parent has been part of the interrupt mapping spec from the >> inception of same. >> >> http://www.openfirmware.info/docs/rec.intmap.d09.pdf > > Thanks for the link. > > In my vast collection of Sun OF dumps, I cannot find a single instance > where they've made use of this property, which is why I've never seen > it before. I can't say I'm surprised at that. Sun hardware tends to be rather more hierarchical than is the norm in, for example, the PC space. This particular document came into being during the CHRP era, when IBM and Apple were trying to glue a Macintosh legacy I/O system onto the side of a PC legacy I/O system. The result was not pretty. Sun had at least the semblance of a coherent architectural design and review process.