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Date: Wed, 10 Sep 2008 18:54:37 +0200
From: Wolfgang Grandegger <wg@grandegger.com>
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To: Jon Smirl <jonsmirl@gmail.com>
Subject: Re: interrupt cells on mpc5200
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Jon Smirl wrote:
> mpc5200 interrupts have three cells in the device tree. How are these
> interpreted?
> Middle one is the interrupt number. Last one seems to always be zero.
> What does the first one do, edge/level?
> 
> I searched through /Documentation and could find anything about three
> cells for interrupts.
> 
> I understand the first one for gpio_wkup on interrupt 8. How does a
> gpio_wkup generate an interrupt on interrupt 3?
> 
> 		gpio_wkup: gpio-wkup@c00 {
> 			compatible = "fsl,mpc5200b-gpio-wkup","fsl,mpc5200-gpio-wkup";
> 			reg = <0xc00 0x40>;
> 			interrupts = <0x1 0x8 0x0 0x0 0x3 0x0>;
> 			interrupt-parent = <&mpc5200_pic>;
> 			gpio-controller;
> 			#gpio-cells = <2>;
> 		};

See
http://lxr.linux.no/linux+v2.6.26.5/Documentation/powerpc/mpc52xx-device-tree-bindings.txt#L263

Wolfgang.