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    SubjectRe: [LINUX RFC v2 1/4] spi: add support of two chip selects & data stripe
    On Fri, Sep 04, 2015 at 02:35:52PM +0200, Martin Sperl wrote:
    > > On 03.09.2015, at 14:12, Mark Brown <broonie@kernel.org> wrote:

    > > This isn't saying that the controller supports more than one chip, it's
    > > saying that the controller supports asserting more than one chip select
    > > at once which isn't the same thing. I'm also not entirely sure that
    > > this makes sense as a separate feature to the data striping one - I'm
    > > struggling to think of a way to use this sensibly separately to that.

    > Well - there is one use-case that I can think of:
    > fbtft has the requirement for some devices to control a GPIO to
    > differentiate between command and data getting transferred
    > - sort of 9 bit.

    That's another thing again, isn't it? It's one device switching between
    two different control interfaces at runtime rather than two devices
    controlled in lockstep.
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