Sean MacLennan wrote:
On Wed, 23 Jul 2008 15:58:38 +0100
"Richard Whitlock" <[EMAIL PROTECTED]> wrote:
I have a small problem with a port of linux 2.6.26 to a custom board.
Our board is almost identical to the Analogue & Micro asp 8347 board,
so I'm using Kumar Gala's excellent fsl tree (thank you Kumar) as it
already has a defconfig for the asp.
Thanks also to Bryan O'Donoghue for pointing us in the direction of
the asp port in the first place.
The problem we have is I am unable to request an external interrupt.
We have an FPGA which has an interrupt line - HW IRQ_0, so thats
linux IRQ 48. I have added the following to the dts file:
[EMAIL PROTECTED] {
interrupts = <48 8>;
interrupt-parent = <&ipic>;
}
but whenever I call request_irq() it returns -ENOSYS.
The driver loads fine, and the open function does very little - a
call to ioremap() - which works, and a call to request_irq() which
does not. Is there anything else I have to do to configure this
interrupt?
I don't think you have enough information in the dts. We do the same
thing on the warp (you can look at the warp.dts):
[EMAIL PROTECTED],0 {
compatible = "pika,fpga";
reg = <0x00000002 0x00000000 0x00001000>;
interrupts = <0x18 0x8>;
interrupt-parent = <&UIC0>;
};
You need the compatible, maybe "kfaf,fpga", and I believe the reg entry
although you could try without it.
You then can use:
of_find_compatible_node
irq_of_parse_and_map
request_irq
platforms/44x/warp.c shows an example using the ad7414. Just change the
ad7414 string to your compatible string.
Cheers,
Sean
Sean,
Thanks for that - our original code had no call to irq_of_parse_and_map().
We've put that in, as well as a call to of_find_compatible_node(), and
now everything works fine. We have also modified our dts file along the
lines you suggested.
Cheers,
Richard.
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