linux-kernel - Re: [PATCH 1/2] [v4] net: emac: emac gigabit ethernet controller driver

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Message-ID: <57110C70.9090007@codeaurora.org>
Date:	Fri, 15 Apr 2016 10:44:48 -0500
From:	Timur Tabi <timur@...eaurora.org>
To:	Rob Herring <robh+dt@...nel.org>
Cc:	Vikram Sethi <vikrams@...eaurora.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	Sagar Dharia <sdharia@...eaurora.org>,
	Shanker Donthineni <shankerd@...eaurora.org>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Christopher Covington <cov@...eaurora.org>,
	Gilad Avidov <gavidov@...eaurora.org>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	Mark Langsdorf <mlangsdo@...hat.com>,
	Jon Masters <jcm@...hat.com>,
	Andy Gross <agross@...eaurora.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/2] [v4] net: emac: emac gigabit ethernet controller
 driver

Rob Herring wrote:
>> >
>> >         dma-mask = <0 0xffffffff>;
>> >
>> >or
>> >
>> >         dma-mask = <0xffffffff 0xffffffff>;
> No. See dma-ranges.

How exactly should I use dma-ranges?  I can't find any other drivers 
that queries that property and uses the result to call dma_set_mask.  I 
thought the dma-ranges property is intended to specify address 
translation.  I don't need to translate any address, I just need to know 
a single number.

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