On Tue, Aug 21, 2012 at 03:22:18PM +0300, Felipe Balbi wrote: > On Tue, Aug 21, 2012 at 05:50:28PM +0530, Poddar, Sourav wrote:
> > If I am understanding correctly, if they both uses the same bit we cannot > > use both for a particular user. ? > we can, it's just a bit more complex. If a user request both LOW and > HIGH, then you start with HIGH, once it triggers, before calling the > nested IRQ handler, you need to change it LOW. When low triggers, before > calling the nested IRQ handler, you need to change it to HIGH again. And > so on. I'm just not sure if that's valid on linux IRQ subsystem. The given example was for keypress - usually a system would use edge triggered interrupts in combination with reading the GPIO state rather than level triggered interrupts. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
