On Sat, 29 Mar 2008 17:56:51 +0100, Haavard Skinnemoen <[EMAIL PROTECTED]> wrote: > > Though some discussion about zero length transfer were raised by this > > patch last time, I think there were no explicit objection to this > > patch itself. > > Well, the patch doesn't seem to do any harm, but I can't see much of a > point to it either if zero-length transfers aren't going to be > allowed...
Well, some wired device might want long delay before first CLK edge. I think most device do not have such constraint, but ... Anyway, SPI framework does not reject it. So I think the controller driver should accept it unless it is hard to support on that hardware. > Also, if the length is zero, the driver will end up doing a memset with > length zero at some point. Is that allowed? I believe memset() with zero length should be allowed. It seems ambiguous that dma_sync_single_for_device() with zero length is legal or not. Actually, it seems OK on ARM and AVR32. --- Atsushi Nemoto ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
