On Tue, Feb 25, 2014 at 10:55:28PM +0900, Atsushi Nemoto wrote: > Is xfer->len == 0 invalid? > Long time ago I have fixed atmel spi driver to support zero length > transfer (commit 06719814 atmel_spi: support zero length transfer). > According to Documentation/spi/spi-summary, zeto length transfer seems > valid. > + optionally defining short delays after transfers ... using > the spi_transfer.delay_usecs setting (this delay can be the > only protocol effect, if the buffer length is zero); *sigh* I guess it is valid, though frankly I'm concerned that this isn't a good idea - it's certainly not going to work reliably given the need for every driver to open code this, most of them get the delay stuff wrong.
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