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

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Message-Id: <EFF451D9-552A-4820-90D3-BF3156D5B25F@kernel.crashing.org>
Date:	Tue, 29 Nov 2011 19:47:46 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Scott Wood <scottwood@...escale.com>
Cc:	<dedekind1@...il.com>, 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 Nov 29, 2011, at 3:48 PM, Scott Wood wrote:

> 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

As Scott said, I was more asking about the 2nd patch in the sequence which did touch MTD.  Since that one is dependent on this patch, wondering how we wanted to handle them.

- k

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