On Friday 23 of August 2013 17:19:50 Stephen Warren wrote: > On 08/23/2013 05:04 PM, Tomasz Figa wrote: > > On Friday 23 of August 2013 16:11:18 Stephen Warren wrote: > >> On 08/22/2013 05:22 PM, Tomasz Figa wrote: > >>> This patch extends vic_of_init to parse valid interrupt sources > >>> and resume sources masks from device tree. > >>> > >>> If mask values are not specified in device tree, all sources > >>> are assumed to be valid, as before this patch. > >> > >> Can you explain further why the VIC needs this information up-front? > >> Presumably it can accumulate it as devices request interrupts. > > > > It does not need this information just for operation, but this makes > > the hardware description more detailed and allows better sanity > > checking of interrupts being requested. > > Ah, OK. It may be worth mentioning the intent of the properties. Right, a bit more detailed description will be nice indeed. I didn't think such thing like this is so uncommon to need such. > I > suppose this is purely a representation of HW then, so it's reasonable > to include it in the binding. I'm not sure /quite/ how useful it is; > after all the error-checking that it enables will never trigger assuming > the rest of the DT is written to "request" the correct interrupts. > However, I guess there is little harm in allowing these properties. Well, the valid-mask is indeed a bit redundant (although might let you spot errors in interrupt specification in your device tree faster), but wakeup-mask is something that prevents drivers from incorrectly thinking that an interrupt can wake the system up, while it can't. Otherwise enable_irq_wake() wouldn't know when to return an error. > Bikeshedding a bit, but perhaps rename wakeup-mask to valid-wakeup-mask > (and perhaps valid-mask to valid-source-mask for consistency, although I > see you already renamed that to be consistent with other bindings...)? > To me, wakeup-mask sounds like a configuration of which sources should > be configured to wakeup the system; something to do with > configuration/policy rather than HW capabilities. Yes, valid-wakeup-mask sounds reasonably to me. The valid-mask property has been taken from bindings/arm/versatile-fpga-irq.txt, as suggested by Linus Walleij. > Either way, the binding, > Acked-by: Stephen Warren <swarren@xxxxxxxxxx> Thanks. > (I assume those 2 new properties always have 1 cell since the controller > can only support up to 32 IRQ sources? If not, then perhaps add wording > to describe how long the properties should be). Correct, one VIC can support up to 32 interrupt sources. A word on this in binding description will be nice indeed. Best regards, Tomasz -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
