Messages in this thread | | | Date | Thu, 25 Jul 2013 00:13:53 +0530 | From | Sricharan R <> | Subject | Re: [PATCH 1/3] misc: Add crossbar driver |
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On Wednesday 24 July 2013 10:17 PM, Nishanth Menon wrote: > On 07/24/2013 11:38 AM, Santosh Shilimkar wrote: >> On Wednesday 24 July 2013 12:08 PM, Nishanth Menon wrote: >>> That said, maybe a intermediate pinctrl approach might be more pragmatic and less theoretically flexible. >>> an option might be to "statically allocate" default number of interrupts to a domain - example: >>> * GIC IRQ 72->78 allotted to UARTs >>> * pinctrl mapping provided for those but only 6 can be used (rest are marked status="disabled" as default) at any given time (choice of pinctrl option determines GIC interrupt line to use) >>> * All modules will have a pinctrl definition to have a mapping - to avoid bootloader overriding default cross bar setting in ways un-expected by kernel. >>> >>> Does that sound fair trade off? >> This sounds better. That way we can get all the devices in the DT at least. > > Fair enough - if Linus and Tony are still ok with this approach to the problem, seeing a patch series with the effect would be beneficial. > Ok, i will use this idea of certain number interrupts to groups. Yes on DRA7XX, we have about 160 gic lines and 320 irq crossbar device inputs contending for it. 1:2 and fully arbitrary. But will we be really exhausting them ?
Regards, Sricharan
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