[PATCH 5/7] add GPMI support for imx28

[Lothar Waßmann]

Hi,

Jason Liu writes:
> 2011/3/24 Lothar Waßmann <LW at karo-electronics.de>:
> > Hi,
> [...]
> >> Most of the time, the timing is really based on a safe timing setting.
> >> But in the original GPMI driver in the FREESCALE BSP, there exits some
> >> nands need to be set with their own timing setting.
> >>
> >> So I do not use the safe timing for _ALL_ the nand, and i'd better get
> >> it from the
> >> database.
> >>
> > It should be sufficient to provide timing info from platform_data in
> > special cases instead of bloating the nand id database with that
> > stuff. Platforms might need to adjust the timing because of
> > peculiarities in the HW. Thus the timing info should be provided from
> > there, not from the chip database.
> 
> No, we can't. since some boards only provide one NAND socket, customer
> can place any NAND flash chip they want. And with the NAND tech evolution, some
> NAND flash will end-of-line and customer need change another new NAND.
> As we all know that RAW NAND flash vendor does not follow the same
> rule to encode
> ID related information such as page size/oob size/block size etc. Even
> with same vendor,
> take Sumsung as example, there is not one generic rule to encode the
> id information.
> If you do NAND support with many customers, you will find that
> currenly linux NAND driver
> (nand_base.c/nand_ids.c) provide very poor support for that.
> 
That's a reason to improve that support, not to invent private fixes
for each chip driver.


Lothar Waßmann
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