On Fri, 4 Jul 2014 18:34:10 +0200 Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> wrote: > While comparing the OMAP-serial and the 8250 part of this I noticed that > the the latter does not use runtime-pm. Yes it does, but 8250 parts (generally - omap presumably is special here ?) need to be powered on to transmit/receive not just for register access. The core uart layer implements a "pm" operation for this. As 8250_dw uses runtime pm to implement the pm operation it's not as simple as assumign it won't get triggered. I *think* this is ok because the designware and other cases would take a reference on open and drop it on close, so avoiding any confusion, but for the register accesses on a closed port it would benefit from a further double check with Mika especially as the suspend/resume on the LPSS block on some Intel devices is a little bit too "interesting" for comfort. Otherwise however I think this is good. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
