support DUAL and QUAD[patch v1]

[Mark Brown]

On Tue, Jul 16, 2013 at 04:59:49PM +0800, yuhang wang wrote:

> > [Pekon]: Instead of adding new fields you can use existing 'mode' field to
> > pass on the platform specific configurations. And if 'u8 mode' does not
> > suffice you can increase it to 'u32'.
> > #define QSPI_MODE       1 << 5; // just check which bit-fields are un-used
> > spi_board_info->mode |= QSPI_MODE;

> well, can dual and quad be regarded as a spi mode? if so, your comment seems
> to be right.

Yes, I think this is a good suggestion.
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