> 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-d...@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/p...@0/xps-acqui-d...@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/
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