SPI: DUAL/QUAD support

[Mark Brown]

On Fri, Jul 05, 2013 at 05:41:57PM +0800, yuhang wang wrote:

> Yes. I agree with you. This should be described in SPI level.
> So to SPI controller, if it has the ability to transfer in 2x or 4x, but
> what a pity no device can tell this info to it. No matter what the slave
> is and no matter whether they will use the spi transfer width member,
> firstly SPI controller should provide these members. If the slave do
> not set the member, that means the slave wants to communicate
> in 1 line traditionally.

Yes, it definitely makes sense to have this as a feature in the SPI
core.  We just need a good API for it, which I think is mostly just
about working out what to call things.
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