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Date: Thu, 25 Jul 2013 00:13:53 +0530 From: Sricharan R <r.sricharan@...com> To: Nishanth Menon <nm@...com> CC: Santosh Shilimkar <santosh.shilimkar@...com>, Linus Walleij <linus.walleij@...aro.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "devicetree-discuss@...ts.ozlabs.org" <devicetree-discuss@...ts.ozlabs.org>, "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, Linux-OMAP <linux-omap@...r.kernel.org>, ext Tony Lindgren <tony@...mide.com>, Russell King - ARM Linux <linux@....linux.org.uk>, Rajendra Nayak <rnayak@...com>, Felipe Balbi <balbi@...com>, Thomas Gleixner <tglx@...utronix.de>, Grant Likely <grant.likely@...retlab.ca> Subject: Re: [PATCH 1/3] misc: Add crossbar driver 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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