[RFC PATCH 0/2] spi: add dual parallel & stacked mode support in Zynq MPSoC GQSPI controller

[Mark Brown]

On Fri, Jul 10, 2015 at 10:28:59AM +0200, Mike Looijmans wrote:
> On 09-07-15 14:44, Ranjit Waghmode wrote:

> >ZynqMP GQSPI controller supports stacked mode with following functionalities:
> >1) The Generic Quad-SPI controller also supports two SPI flash memories
> >    in a shared bus arrangement to reduce IO pin count.
> >2) Separate chip select lines
> >3) Shared I/O lines
> >4) This mode is targeted for increasing the flash memory and no performance
> >    improvement when compared with single.

> One could also model the stacked mode as having two distinct flash chips
> with separate chip selects and shared lines.

Well, quite.  I'm confused about how the above differs from a just a SPI
controller with two chip selects which is perfectly standard.
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