[PATCHv2 00/10] Add memory mapped support for ti qspi, m25p80 serial flash.

[Mark Brown]

On Tue, Dec 10, 2013 at 07:22:10PM +0100, Marek Vasut wrote:
> On Tuesday, December 10, 2013 at 05:11:43 PM, Mark Brown wrote:

> > There is some stuff that pushes up into the controller in that while the
> > device is in memory mapped mode as far as I can tell it's not safe to do
> > other accesses so if someone's put more than one device on the SPI bus
> > we need to handle interactions there.

> OK, so it's either-or . That seems OK, you might want to have two drivers for 
> this ip block, one to handle it as a SPI block and one to handle it as a SPI-NOR 
> block. ... that is of course, if these two modes can't work together.

Or the client disables the memory map when it's not actively being used
and the stops other transfers starting while the mapping is in place.
I'd expect we'll have to cope with shared use at some point, hardware
engineers will probably build such systems.
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