From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756213AbcAMKJS (ORCPT ); Wed, 13 Jan 2016 05:09:18 -0500 Received: from foss.arm.com ([217.140.101.70]:39661 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751314AbcAMKJO (ORCPT ); Wed, 13 Jan 2016 05:09:14 -0500 Date: Wed, 13 Jan 2016 10:09:11 +0000 From: liviu.dudau@arm.com To: Arnd Bergmann Cc: Rongrong Zou , Rongrong Zou , devicetree@vger.kernel.org, Catalin Marinas , Corey Minyard , gregkh@linuxfoundation.org, Will Deacon , linux-kernel@vger.kernel.org, linuxarm@huawei.com, benh@kernel.crashing.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v1 3/3] ARM64 LPC: update binding doc Message-ID: <20160113100911.GU13633@e106497-lin.cambridge.arm.com> References: <1451396032-23708-1-git-send-email-zourongrong@gmail.com> <5694C6A4.8060308@huawei.com> <20160112101418.GO13633@e106497-lin.cambridge.arm.com> <4052627.BRvFkUij6q@wuerfel> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4052627.BRvFkUij6q@wuerfel> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 12, 2016 at 11:54:59PM +0100, Arnd Bergmann wrote: > On Tuesday 12 January 2016 10:14:18 liviu.dudau@arm.com wrote: > > > > OK, looking at of_translate_one() comments it looks like a missing "ranges" property is > > only accepted on PowerPC. I suggest you have an empty "ranges" property in your isa > > parent node, that will signal to the OF parsing code that the mapping is 1:1. Then have > > the IPMI node use the reg = <0x0 0xe4 4>; property values instead of reg = <0x1 0xe4 4>; > > > > > > A missing ranges property means that there is no translation, while an > empty ranges means a 1:1 translation to the parent bus. > > We really want the former here, as I/O port addresses are not mapped into > the MMIO space of the parent bus. Agree. However of_translate_one()'s behaviour doesn't match our expectations and I have no useful suggestions on what the right behaviour should be. Best regards, Liviu > > Arnd > -- ==================== | I would like to | | fix the world, | | but they're not | | giving me the | \ source code! / --------------- ¯\_(ツ)_/¯