[PATCH 1/3] spi: core: add max_msg_size to spi_master

[Mark Brown]

On Sun, Nov 22, 2015 at 12:01:40AM +0100, Heiner Kallweit wrote:
> Add a member to spi_master allowing to better handle
> SPI chips with a message size HW limit.

How many devices have an actual message size limit (as opposed to a
transfer size limit)?  It seems like the restrictions here are really on
transfer sizes and that we probably want a second limit for devices that
aren't able to deal with multiple transfers independently.

For slightly more complex things like this it probably also makes sense
to use an accessor - I can see us wanting to combine restrictions from
DMA engines into restrictions for the SPI controller for example.  That
gives us a bit of insulation between the clients and the API.
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