On Thu, Jun 06, 2024 at 04:57:52PM -0300, Marcelo Schmitt wrote: > As far as I searched, the definitions for SPI protocol usually don't specify any > behavior for the MOSI line when the controller is not clocking out data. > So, I think SPI controllers that are not capable of implementing any type > of MOSI idle configuration are anyway compliant to what is usual SPI. > For those that can implement such feature, I thought peripherals could request > it by setting SPI mode bits. The issue here is the one that Richard highlighted with it not being clear exactly what the intended behaviour is. > But yeah, it's not that evident what this patch set is all about and why this is > wanted so I made a wiki page to explain the reasoning for this set. > https://wiki.analog.com/software/linux/docs/spi/spi_copi_idle?rev=1717699755 > Hopefully the figures with timing diagrams and transfer captures there will > provide quicker understanding of this rather than I try to explain it with > only text. It needs to be apparent to someone looking at the kernel what the code is intended to do. > If you still think we need feature detection for MOSI idle capability just let > me know, I'll implement what be needed. If the devices actually require this mode then we can't just randomly ignore them when they request it.
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