linux-kernel - Re: [PATCH v4 0/7] Add TI EMIF SDRAM controller driver

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Date:	Thu, 12 Apr 2012 07:21:18 -0700
From:	Kevin Hilman <khilman@...com>
To:	"Mohammed\, Afzal" <afzal@...com>
Cc:	Greg KH <greg@...ah.com>,
	"Shilimkar\, Santosh" <santosh.shilimkar@...com>,
	Paul Walmsley <paul@...an.com>, "V\, Aneesh" <aneesh@...com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-omap\@vger.kernel.org" <linux-omap@...r.kernel.org>,
	"mgreer\@animalcreek.com" <mgreer@...malcreek.com>,
	"msalter\@redhat.com" <msalter@...hat.com>
Subject: Re: [PATCH v4 0/7] Add TI EMIF SDRAM controller driver

"Mohammed, Afzal" <afzal@...com> writes:

> Hi Greg,
>
> On Thu, Apr 12, 2012 at 18:40:45, Greg KH wrote:
>> On Thu, Apr 12, 2012 at 12:17:49PM +0530, Santosh Shilimkar wrote:
>> > I was hoping that we will have some thing like drivers/memory/*
>> > but since it doesn't exist, we used drivers/misc.
>> 
>> Why not create it?  I have no objection to that, it makes it more
>> obvious as to what this really is.
>
> There is another memory controller used in a few TI SoCs,
> namely GPMC [1], do you prefer having it too there.
>
> As of now it is not a driver, platform code handles GPMC, a patch
> series for converting it into a driver (but still residing in
> platform folder) was sent a few days back [2,3].

IMO, wherever EMIF ends up, GPMC should as well.

Kevin


> [1]
> GPMC (General Purpose Memory Controller) in brief:
> GPMC is an unified memory controller dedicated to interfacing external
> memory devices like
>  Asynchronous SRAM like memories and application specific integrated circuit devices.
>  Asynchronous, synchronous, and page mode burst NOR flash devices NAND flash
>  Pseudo-SRAM devices
>
> GPMC has to be configured as required by timings of the connected
> peripheral. It needs to be configured only initially. Once it is
> configured it can be used to handle different protocols like NAND,
> NOR. Various kinds of devices like ethernet, uart, usb, fpga etc
> can work using GPMC interface. GPMC has a seperate additional
> functionality of NAND handling
>
> [2] https://lkml.org/lkml/2012/4/5/210
> [3] https://lkml.org/lkml/2012/4/5/212
>
>
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