SPI : DUAL/QUAD support

[Mark Brown]

On Thu, Jul 04, 2013 at 03:07:31PM +0800, 王宇航 wrote:

> Now some SPI controllers and Slave Devices have supported
> DUAL and QUAD transfer mode. But SPI controller driver in kernel
> has no member to deliver this information from Slave to Master.
> So in my opinion, adding transfer mode members to deal with the problem.

You'll need to tell us what "DUAL" and "QUAD" modes are and provide some
kerneldoc for the new fields.
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