On Fri, Jun 28, 2013 at 10:51:44AM +0800, Scott Jiang wrote: > > Thinking about this a bit it might reject a valid transfer - it only > > checks the setting in the SPI device, not the setting in the transfer.
> But the API description said that this call would fail if the protocol > driver specifies an option > that the underlying controller or its driver does not support. It's > strange if I request 9 bits per > word in setup successfully while calling it in transfer fail. Yes, it's a bit odd (and I'd never expect a failure to actually trigger here that wasn't going to be repeated in the actual transfer) but it seems more robust.
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