From mboxrd@z Thu Jan  1 00:00:00 1970
From: arnd@arndb.de (Arnd Bergmann)
Date: Tue, 12 Jan 2016 23:54:59 +0100
Subject: [PATCH v1 3/3] ARM64 LPC: update binding doc
In-Reply-To: <20160112101418.GO13633@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>
Message-ID: <4052627.BRvFkUij6q@wuerfel>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Tuesday 12 January 2016 10:14:18 liviu.dudau at 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.

	Arnd