linux-kernel - Re: [PATCH 0/3] An alternative to SPI NAND

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Date:	Thu, 8 Jan 2015 00:27:07 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...tec.com>
To:	"Qi Wang 王起 (qiwang)" 
	<qiwang@...ron.com>, Brian Norris <computersforpeace@...il.com>
CC:	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"Frank Liu 刘群 (frankliu)" 
	<frankliu@...ron.com>,
	"Melanie Zhang 张燕 (melaniezhang)" <melaniezhang@...ron.com>,
	"Peter Pan 潘栋 (peterpandong)" 
	<peterpandong@...ron.com>
Subject: Re: [PATCH 0/3] An alternative to SPI NAND

Hi Qi Wang,

On 01/07/2015 11:45 PM, Qi Wang 王起 (qiwang) wrote:
> Hi Brian,
> 
> On Thu, Jan 08, 2015 at 9:03:24AM +0000, Brian Norris wrote:
>>
>> On Thu, Jan 08, 2015 at 12:47:24AM +0000, Peter Pan 潘栋 (peterpandong)
>> wrote:
>>> Documentation/devicetree/bindings/mtd/spi-nand.txt |   22 +
>>> drivers/mtd/Kconfig                                |    2 +
>>> drivers/mtd/Makefile                               |    1 +
>>> drivers/mtd/spi-nand/Kconfig                       |    7 +
>>> drivers/mtd/spi-nand/Makefile                      |    3 +
>>> drivers/mtd/spi-nand/spi-nand-base.c               | 2034
>> ++++++++++++++++++++
>>> drivers/mtd/spi-nand/spi-nand-bbt.c                | 1279 ++++++++++++
>>
>> I can already tell by the diffstat that I don't like this. We probably
>> don't need 3000 new lines of code for this, but we especially don't want
>> to duplicate nand_bbt.c. It won't take a lot of work to augment
>> nand_bbt.c to make it shareable. (I can whip that patch up if needed.)
> 
> Yes, I agree with you, Nand_bbt.c do can be shared by Parallel NAND and
> SPI NAND. Actually, we are working at this now. Will send patches to you
> Once we finished it.
> 

Thanks for the quick submission!

However, Brian is right, this code duplication is a no go.

Perhaps a more valid approach would be to first identify the code that
needs to be shared in nand_bbt.c and nand_base.c, and export those
symbols (or maybe do the required refactor).

Then, separate the SPI NAND upper and lower logic (in a similar to my
proposal, which I still consider turned out to be clean).

These two things would lead to a simpler and smaller patchset. I also
suggest to cut off everything that we don't utterly need on a first
submission, so it's easier to review.
-- 
Ezequiel
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