linux-kernel - Re: [PATCH v3 05/11] memory: add Atmel EBI (External Bus Interface) driver

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Date:	Mon, 1 Dec 2014 11:50:06 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Andrew Victor <linux@...im.org.za>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: Re: [PATCH v3 05/11] memory: add Atmel EBI (External Bus Interface)
 driver

Hi Alexander,

On Mon, 01 Dec 2014 11:40:03 +0100
Alexander Stein <alexander.stein@...tec-electronic.com> wrote:

> Hi Boris,
> 
> On Monday 01 December 2014 11:27:21, Boris Brezillon wrote:
> > The EBI (External Bus Interface) is used to access external peripherals
> > (NOR, SRAM, NAND, and other specific devices like ethernet controllers).
> > Each device is assigned a CS line and an address range and can have its
> > own configuration (timings, access mode, bus width, ...).
> > This driver provides a generic DT binding to configure a device according
> > to its requirements.
> > For specific device controllers (like the NAND one) the SMC timings
> > should be configured by the controller driver through the matrix and
> > smc syscon regmaps.
> > 
> > Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> > Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> > ---
> >  drivers/memory/Kconfig     |  11 +
> >  drivers/memory/Makefile    |   1 +
> >  drivers/memory/atmel-ebi.c | 627 +++++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 639 insertions(+)
> >  create mode 100644 drivers/memory/atmel-ebi.c
> 
> While I like this feature, shouldn't this driver go to drivers/bus/ like the imx-weim driver? The latter one does the same, so I wonder why one is in drivers/bus while the other is in drivers/memory.
> 

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 ?

Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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