[PATCH 1/3] spi/qspi: Add memory mapped read support.

[Mark Brown]

On Thu, Oct 10, 2013 at 04:38:19PM +0530, Sourav Poddar wrote:
> On Thursday 10 October 2013 03:44 PM, Mark Brown wrote:

> >Essentially what it looks like this hardware is trying to do is adapt a
> >serial flash so it looks more like a parallel flash.  It's not clear
> >that this is a good idea if we are already able to understand serial
> >flash though.

> Do you have any idea of how to go about implementing it in a more
> cleaner way?(taking care of all what the spi controller hardware needs to
> do for the memory mapped mode.). I understand doing a memcpy in the caller
> itself, but how to tackle the spi controller configuration at that
> point of time.

You'd need to lock the bus and return the address for the caller to use
until it released the lock.  Like I say I'd want to see numbers on this
helping though.

> Memory mapped is  a spi controller feature rather than a flash.

The way it appears to be implemented is pretty flash specific isn't it?
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