On Mon, Nov 18, 2013 at 02:24:47PM +0000, Lee Jones wrote:

For example, we have thought about inserting a layer which handles the
type of communication that'll be utilised i.e. true SPI, or our
bespoke FSM implementation for instance. This would enable us to issue
serial_flash_write(), serial_flash_write_then_read(), ... in the m25p80
driver and not care which protocol is used. However, in reality this
won't really save a great deal of code - not in our case at least.

Right, that's what I'm suggesting.  It's not so much for the code saving
as for the data saving, allowing device trees that just say "flash chip
X is connected" rather than requiring either the flash chip information
in multiple places in the kernel or (worse) have the commands added to
the DTs of individual boards using the flash chip.
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