[PATCH v2 0/5] Assorted OMAP2 NAND clean-ups

[Gupta, Pekon]

Hi,

> -----Original Message-----
> From: Ezequiel Garcia [mailto:ezequiel.garcia at free-electrons.com]
[...]

> Pekon, Brian: Do you think this solution might work for 8-bit and 16-bit
> devices?
> 
I think NAND_BUSWIDTH_AUTO (without GPMC changes) would fail in
following scenarios..

Case-1: configuring gpmc,device-width=1 from DT when using x16 device.
As your NAND driver is using NAND_BUSWIDTH_AUTO, it should
ignore this DT config, and based on ONFI params it should work as x16

Case-2: configuring gpmc,device-width=2 from DT when using x8 device.
As your NAND driver is using NAND_BUSWIDTH_AUTO, it should
ignore this DT config, and based on ONFI params it should work as x8

NAND device may get detected correctly, but try doing write and read
to NAND, and I think, it would fail for Case-2 at-least.. 
Can you please check ?


> I've been going through the GPMC code again, and it looks like some cleaning
> is needed
> there two, but that's a different story!
> 
Actually having NAND_BUSWIDTH_AUTO would require change in GPMC
driver also.. please refer my comments in.. 
http://lists.infradead.org/pipermail/linux-mtd/2013-October/049284.html

reason of failure is given above...


with regards, pekon