Messages in this thread | | | Date | Thu, 11 Oct 2018 14:46:36 +0100 | From | Mark Brown <> | Subject | Re: [PATCH 1/2] dt-bindings: spi: dw: add cs-override property |
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On Wed, Oct 10, 2018 at 10:21:51PM +0000, Trent Piepho wrote:
> So that's the problem! I, like everyone else I suspect, switched to > using GPIO chip selects with this driver because of this. I narrowed
That's generally a good idea.
> it down to a CS de-assert when the bus switched from TX to RX, which of > course makes a SPI register read fail on most devices. The TX FIFO > would empty at this point, so that would explain it.
> Did the designers of this IP ever read a SPI device datasheet???
> Got to agree with Mark Brown, why would anyone ever want to NOT have it > work properly? The previous behavior is not "alternate correct", it's > Broken.
This isn't even that unusual an innovation for hardware to have, for some reason automatic chip select management is *really* popular and rarely helpful. It's far from the most entertaining thing I've seen hardware do. [unhandled content-type:application/pgp-signature] | |