Messages in this thread | | | Subject | Re: [LINUX RFC v2 1/4] spi: add support of two chip selects & data stripe | From | Martin Sperl <> | Date | Fri, 4 Sep 2015 17:48:59 +0200 |
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> On 04.09.2015, at 17:37, Mark Brown <broonie@kernel.org> wrote: > > 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.
I agree, but there may be a solution that can handle both, so I wanted to mention it.
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