Re: Configuration-Problem ext-interrupt on mpc52xx

On Wed, Sep 19, 2007 at 09:01:46PM +0200, S. Fricke wrote:

Hello,

quoted

On 9/19/07, S. Fricke [off-list ref] wrote:

quoted

Hi,

how can i configure an "ext interrupt" to high-level? I want a interruption on
IRQ2, but I checked with an oscilloscope that the pin has a low state and I
needs a high state.

I have tried, after I got the irq (with irq_of_parse_and_map), set it with

    set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);

But I think it is a system-configuration (irq_desc) and no
device-configuration.

You shouldn't need to do this.  You set your sense level in the device tree.

From your previous email, your device node looks like this:

quoted

            intpin@0 {
                interrupt-parent = <500>;
                interrupts = <1 2 2>;
            };

Which is IRQ2, EDGE_FALLING.

If you change your interrupts property to <1 2 0>, then your sense is
set to LEVEL_HIGH.  (Seriously, you need to read the interrupts
section of Documentation/powerpc/mpc52xx-device-tree-bindings.txt.)

I have read it! But another driver on Boot-time pulled my interrupt

Erm.. if the interrupt is shared with something else which expects a
different trigger/polarity, you're kind of stuffed....

to low, I can't do anything except for looking at the oscilloscope

I'm going to disable all unneeded drivers tomorrow morning.

TIA:
Silvio Fricke

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