Messages in this thread | | | Date | Thu, 27 Feb 2020 16:44:25 +0000 | From | Mark Brown <> | Subject | Re: [PATCH v2 01/11] dt-bindings: spi: allow expressing DTR capability |
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On Thu, Feb 27, 2020 at 05:40:31PM +0100, Geert Uytterhoeven wrote: > On Thu, Feb 27, 2020 at 5:28 PM Mark Brown <broonie@kernel.org> wrote:
> > It's what we do for other properties, and if this is anything like the > > other things adding extra wiring you can't assume that the ability to > > use the feature for TX implies RX.
> Double Transfer Rate uses the same wire.
But is it still on either the TX or RX signals?
> But as you sample at both the rising and the falling edges of the clock, this > makes the cpha setting meaningless for such transfers, I think ;-)
Might affect what the first bit is possibly?
> However, as the future may bring us QDR, perhaps this should not be a > boolean flag, but an integer value? > Cfr. spi-tx-bus-width vs. the original spi-tx-dual/spi-tx-quad proposal.
> What would be a good name (as we only need one)? spi-data-phases?
Sounds reasonable, apart from the increasingly vague connection with something that's recognizably SPI :P [unhandled content-type:application/pgp-signature] | |