On Tue, Oct 31, 2017 at 04:57:42PM +0000, Trent Piepho wrote: > On Tue, 2017-10-31 at 11:19 +0000, Mark Brown wrote: > > Do the native chip selects actually work usefully on this hardware? > > There used to be problems with it wanting to do things like bounce the > > chip select on every word which made it extremely difficult to use with > > Linux. > Still are annoying, but on the device we have connected to it, it ends > up working as desired. > I've not thoroughly investigated this hardware to find the details. > IIRC, the designware SPI on Altera SoCFPGA had the same issue, but it > was a flaw in the driver and I was able to fix it. I've come to expect > it, as every new SPI master I use doesn't work properly in some > different way. It's one of the reasons why I'm suspicous of making the GPIO optional, lots of chips use GPIO chipselects because a lot of the breakage is confined to chip select handling and I remember the i.MX as being especially far from useful.
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