Hi Grant,
On 09/27/2011 09:29 PM, Grant Likely wrote:
On Tue, Sep 27, 2011 at 04:59:28PM +0300, Felix Radensky wrote:
Hi,
Looks like 8xxx GPIO driver cannot properly handle interrupts
when multiple GPIO controllers exist in the system.
On Freescale P1022 there are 3 GPIO controllers. All 3 use
the same interrupt line, internal interrupt 31. If all controllers
are defined in device tree set_irq_chained_handler() is invoked
3 times with same hardware irq number. The result is interrupt
storm, mpc8xxx_gpio_irq_cascade() is invoked indefinitely.
What would be the best way to fix the problem ?
The solution is to make the gpio driver register as a regular
interrupt handler, and not as a chained handler.
g.
You mean interrupt handler per GPIO pin ?
Felix.
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