Hi Marc 在 2015/7/16 21:37, Marc Zyngier 写道: [...] >> >> For example, An device with total 5 interrupts connected to Mbigen node. >> In mbigen chip, the default eventID value for each device starts from 0. >> So, for these 5 interrupts the default eventID value is from 0 to 4. >> >> Because the default eventID is fixed in mbigen chip, to make these 5 >> interrupt >> work, the only way is define all these 5 interrupts in dts file. > > But the ITS doesn't read these interrupts, and won't let you program the > translation either. > >> When irq initializing, ITS driver will allocat LPI interrupt number for these >> 5 interrupts, for example : from 8192 to 8196. and the eventID value is from >> 0 to 4. >> Now, the allocated eventID value same as the eventID value encoded in mbigen >> chip, >> The interrupt can work. > > But that's pure luck! What if I decide to change the allocation method > so that all the devices share a common ITT? > > Have you really hardcoded the Linux behaviour in your hardware? > >> I know this is not a good method,but for current mbigen chip,it's the only >> solution. > > I'm sorry, I can't call this a solution. Yes,you are right. This is not a right way to solve the problem. This problem will be fixed in next version chip.
> > M. > -- 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/
