Hi Alan, On Fri, Aug 19, 2016 at 12:03:05PM +0100, One Thousand Gnomes wrote: > > I meant "Either some function similar to userspace's poll() is > > needed, ...". Something like uart_dev_wait_for_rx() > > You can't really do that - it might never return and then how do > you want to handle timeouts and cleanups Well there could be some timeout. As I said, I was thinking about an API similar to poll(), but I agree, that a callback based API is probably the better solution. It's simpler to implement and in most cases simpler to use. > > Alternatively the rx function could be a callback, that > > is called when there is new data. > > That's what the existing API gives you as an ldisc, it can't be > immediate in many cases however but must be buffered. I know and I think the ldisc API is fine in this regard. Also the buffering allows DMA, so that's obviously preferred. > > > I'm assuming the only immediate consumers are in-kernel. > > > > Yes, but the driver should be notified about incoming data. -- Sebastian
Attachment:
signature.asc
Description: PGP signature
