[RFC PATCH 1/5] spi: introduce flag for memory mapped read

[Mark Brown]

On Tue, Jul 28, 2015 at 02:11:12PM +0530, Vignesh R wrote:

> Introduce use_mmap_read field in spi_message struct. This can be set by
> mtd devices (m25p80) to indicate to spi-master (ti-qspi) to perform
> memory mapped read. This helps to distinguish whether the spi-message is
> from mtd layer(hence mmap read is possible) or by other spi devices.

Based on this description and...

> + * @use_mmap_mode: Indicate to spi master to perform memory mapped
> + *	read if possible.

...the internal documentation I unable to tell what is meant by "perform
a memory mapped read", at least to the extent where it is visible
outside of the driver.  This means we can't really use this as a generic
API since other people won't be able to tell what it does.
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