[PATCH 8/8] spi: sirf: make DMA transfer mode optional

[Mark Brown]

On Tue, Sep 02, 2014 at 05:02:37PM +0800, Barry Song wrote:
> From: Qipan Li <Qipan.Li at csr.com>
> 
> some customers want a pure PIO transfer mode even though DMA mode is
> supported. here we give them a Kconfig option, but still keep the DMA
> enabled in default.

This doesn't feel like something for the standard kernel - can you
explain the benefit the customers think they're getting here?  It seems
like either this is something we should have as a more general option,
perhaps controllable at runtime or there's likely to be some bug or
other problem that's being worked around here.
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