On Fri, Mar 18, 2016 at 09:23:10PM +0100, Maxime Ripard wrote: > On Thu, Mar 17, 2016 at 12:54:08PM +0100, Michal Suchanek wrote: > > Very few device drivers would work with 63byte transfers only and the > > code for manually driving the CS line in case the DMA engine fails to > > configure will necessarily go untested most of the time since most > > systems will have DMA configured properly. > That's not true. A significant portion would work. I don't like to > make up numbers, but I guess only the EEPROMs and rather big screens > wouldn't work. You'll probably also see devices doing things like firmware downloads, there's a bunch of applications for larger transfers. Like you say it's definitely not going to be a universal problem though, there's many devices that just use SPI for fast register access.
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