On 12/05/2011 02:21 PM, Anton Vorontsov wrote: > On Mon, Dec 05, 2011 at 01:16:39PM -0600, Rob Herring wrote: > [...] >> At least for DT enabled platforms, we could force "no irq" to be 0 in >> the DT irq code. Searching the dts files, I found 2 occurrences of IRQ0. > > Please note that there are HW IRQ numbers and "Virtual" IRQ numbers. > dev->irq and thus the thing that we pass into request_irq() is a > virtual IRQ thing, a "cookie". > > While in device tree you see real HW IRQ numbers. > > Legal VIRQ is always > 0, while HW IRQ could be >= 0. > If this was all true, then there would be no discussion. This is what we are working towards, but irq_chips all over the arm tree do not support any translation or have base fixed at compile time. Only a few have been converted. And some ARM platforms may never get converted to DT. >> Prima2 has timer on IRQ0, and VersatileAB has watchdog on IRQ0. Prima2 >> should be fine currently as it doesn't use the of_irq_* functions to get >> the timer irq, but that is an issue as it skips any translation. >> VersatileAB should be okay with the VIC irqdomain support. > > It shouldn't be an issue to use of_irq_*() functions for these IRQs. > of_irq_*() will remap HW IRQ 0 to some other VIRQ. If it does not do > this currently, then it's a bug and should be fixed. I think that's what I'm saying. It's either a bug or incomplete DT conversion for the platform. Either way, those should get fixed first. Rob -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
