Getting the IRQ number (Was: Basic driver devel questions ?)

[Guillaume Dargaud]

> I guess it depends how basic they are :)
> 
> If they're basic _powerpc_ driver questions then this is probably the
> right place.
> 
> But I'd say just ask and maybe someone will be able to help, or maybe
> they'll point you somewhere else.

OK, here goes then: how do I get the IRQ number so that I can install an 
interrupt handler on it ?

In my dts file I have:
		xps_acqui_data_0: xps-acqui-data at c9800000 {
			compatible = "xlnx,xps-acqui-data-3.00.a";
			interrupt-parent = <&xps_intc_0>;
			interrupts = < 0 2 >;
			reg = < 0xc9800000 0x10000 >;
			xlnx,family = "virtex4";
			xlnx,include-dphase-timer = <0x1>;
			xlnx,mplb-awidth = <0x20>;
			xlnx,mplb-clk-period-ps = <0x2710>;
			xlnx,mplb-dwidth = <0x40>;
			xlnx,mplb-native-dwidth = <0x40>;
			xlnx,mplb-p2p = <0x0>;
			xlnx,mplb-smallest-slave = <0x20>;
		} ;

In my minimal driver init, I have:
  first = MKDEV (my_major, my_minor);
  register_chrdev_region(first, count, NAME);
  cdev_init(my_cdev, &fops);
  cdev_add (my_cdev, first, count);
So far so good.

Now how do I connect the dots between the hardware definitions from the dts and 
my driver ?
I have:
# ll /proc/device-tree/plb at 0/xps-acqui-data at c9800000/
-r--r--r--    1 root     root          27 Dec  1 16:26 compatible
-r--r--r--    1 root     root           4 Dec  1 16:26 interrupt-parent
-r--r--r--    1 root     root           8 Dec  1 16:26 interrupts
-r--r--r--    1 root     root          15 Dec  1 16:26 name
-r--r--r--    1 root     root           8 Dec  1 16:26 reg
-r--r--r--    1 root     root           8 Dec  1 16:26 xlnx,family
-r--r--r--    1 root     root           4 Dec  1 16:26 xlnx,include-dphase-
timer
-r--r--r--    1 root     root           4 Dec  1 16:26 xlnx,mplb-awidth
-r--r--r--    1 root     root           4 Dec  1 16:26 xlnx,mplb-clk-period-ps
-r--r--r--    1 root     root           4 Dec  1 16:26 xlnx,mplb-dwidth
-r--r--r--    1 root     root           4 Dec  1 16:26 xlnx,mplb-native-dwidth
-r--r--r--    1 root     root           4 Dec  1 16:26 xlnx,mplb-p2p
-r--r--r--    1 root     root           4 Dec  1 16:26 xlnx,mplb-smallest-
slave

But first I'm not sure where to find the IRQ in there, and also I'm not sure if 
reading the filesystem from a module is allowed.

How do I know if this interrupt is shared or not (is it important ?)

Thanks
-- 
Guillaume Dargaud
http://www.gdargaud.net/