From: S. Fricke <hidden> Date: 2007-09-19 11:59:58
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.
Mit freundlichen Gruessen
Silvio Fricke
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----------------------------------------------------------------------------
Silvio,
On Wednesday 19 September 2007 13:59, S. Fricke wrote:
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.
Try with the attached patch.
Regards,
Juergen
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From: Grant Likely <hidden> Date: 2007-09-19 15:09:04
On 9/19/07, S. Fricke [off-list ref] wrote:
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:
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.)
g.
--
Grant Likely, B.Sc., P.Eng.
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grant.likely@secretlab.ca
(403) 399-0195
From: S. Fricke <hidden> Date: 2007-09-19 19:01:55
Hello,
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:
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 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
--
-- S. Fricke ----------------------------- MAILTO:silvio.fricke@gmail.com --
Diplom-Informatiker (FH)
Linux-Entwicklung
----------------------------------------------------------------------------
From: David Gibson <hidden> Date: 2007-09-19 23:40:16
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:
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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david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
From: S. Fricke <hidden> Date: 2007-09-20 08:37:52
Hello,
quoted
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....
YEEeess! An incomplete documentation is suboptimal! In german, we would
say: "[...] Das es die Sau krausst [...]"
I have now used an another Interrupt and it works.
Mit freundlichen Gruessen
Silvio Fricke
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