From: Arnd Bergmann <arnd@arndb.de>
To: Alexander Stein <alexander.stein@systec-electronic.com>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>,
        Nicolas Ferre <nicolas.ferre@atmel.com>,
        Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
        Alexandre Belloni <alexandre.belloni@free-electrons.com>,
        Andrew Victor <linux@maxim.org.za>,
        Samuel Ortiz <sameo@linux.intel.com>, Lee Jones <lee.jones@linaro.org>,
        Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Jean-Jacques Hiblot <jjhiblot@traphandler.com>
Subject: Re: [PATCH v3 05/11] memory: add Atmel EBI (External Bus Interface) driver
Date: Tue, 02 Dec 2014 10:41:57 +0100
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On Tuesday 02 December 2014 10:18:45 Alexander Stein wrote:
> On Monday 01 December 2014 17:17:30, Arnd Bergmann wrote:
> > On Monday 01 December 2014 11:50:06 Boris Brezillon wrote:
> > > 
> > > I don't have a strong opinion regarding where this driver should
> > > live (I even considered putting it in drivers/bus) :-).
> > > But note that there are other "external memory interface" drivers
> > > in drivers/memory too: TI AEMIF and Marvell DEVBUS  ;-).
> > > 
> > > Does anyone else think this driver should go in drivers/bus ?
> > > 
> > 
> > I think drivers/memory is better.
> 
> I don't mind if it's drivers/bus or drivers/memory. But I'm 
> wondering: When is a driver a bus driver when it is a memory
> driver? See imx-weim and atmel-ebi. Apparently both add support
> for devices attached on a bus which can be accessed through memory
> addresses.

I think drivers/memory should be used for external buses with an
SRAM or DRAM interface that need to configure the timings.

drivers/bus is more a collection for random other buses, usually
internal to a chip, but it's less well-defined.

	Arnd

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