linux-kernel - Re: [PATCH v2] Integrated Flash Controller support

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Date:	Tue, 29 Nov 2011 15:48:12 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	<dedekind1@...il.com>
CC:	Kumar Gala <galak@...nel.crashing.org>,
	Li Yang-R58472 <r58472@...escale.com>,
	<Artem.Bityutskiy@...ia.com>,
	"b35362@...escale.com>" <b35362@...escale.com>,
	"linux-kernel@...r.kernel.org Kernel" <linux-kernel@...r.kernel.org>,
	<linux-mtd@...ts.infradead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	"linuxppc-dev@...ts.ozlabs.org list" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2] Integrated Flash Controller support

On 11/29/2011 03:40 PM, Artem Bityutskiy wrote:
> On Thu, 2011-11-24 at 08:24 -0600, Kumar Gala wrote:
>> On Nov 22, 2011, at 9:41 PM, Kumar Gala wrote:
>>
>>>
>>> On Oct 31, 2011, at 4:38 AM, <b35362@...escale.com> <b35362@...escale.com> wrote:
>>>
>>>> From: Liu Shuo <b35362@...escale.com>
>>>>
>>>> Integrated Flash Controller supports various flashes like NOR, NAND
>>>> and other devices using NOR, NAND and GPCM Machine available on it.
>>>> IFC supports four chip selects.
>>>>
>>>> Signed-off-by: Dipen Dudhat <Dipen.Dudhat@...escale.com>
>>>> Signed-off-by: Scott Wood <scottwood@...escale.com>
>>>> Signed-off-by: Li Yang <leoli@...escale.com>
>>>> Signed-off-by: Liu Shuo <b35362@...escale.com>
>>>> ---
>>>> arch/powerpc/Kconfig               |    4 +
>>>> arch/powerpc/include/asm/fsl_ifc.h |  834 ++++++++++++++++++++++++++++++++++++
>>>> arch/powerpc/sysdev/Makefile       |    1 +
>>>> arch/powerpc/sysdev/fsl_ifc.c      |  322 ++++++++++++++
>>>> 4 files changed, 1161 insertions(+), 0 deletions(-)
>>>> create mode 100644 arch/powerpc/include/asm/fsl_ifc.h
>>>> create mode 100644 arch/powerpc/sysdev/fsl_ifc.c
>>>
>>> Guys,
>>>
>>> How are we handling this patchset since it touches drivers/mtd/nand?
> 
> I do not see it touching MTD from the diffstat above. I am a little bit
> confused why a flash controller is added to
> arch/powerpc/sysdev/fsl_ifc.c ?

It's really a bus controller, with NOR, NAND, and general-purpose modes
settable per chipselect.  The actual NAND driver goes in
drivers/mtd/nand, and is apparently in a separate patch (probably due to
separate maintenance domains).

It's the same situation as arch/powerpc/sysdev/fsl_lbc.c versus
drivers/mtd/nand/fsl_elbc_nand.c and drivers/mtd/nand/fsl_upm.c.

-Scott

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