AM335x GPIO interrupt and /proc/interrupts

Keldy

Expert 1835 points

Hi,

How to map GPIO interrupt to /proc/interrupts ?

Using the ioremap(), i have done memory map AM335x GPIO register and set GPIO1_26 as input interrupt,

GPIO_IRQSTATUS_SET_0 |= 1 << 26; //enable interrupt on pin26

GPIO_IRQSTATUS_SET_1 |= 1 << 26; //enable interrupt on pin26

GPIO_OE |= 1 < 26 //set pin 26 as input

GPIO_RISINGDETECT |= 1 << 26; //enable IRQ on rising edge on pin 26

i use "cat /proc/interrupts" command to view my interrupt, but nothing change on /proc/interrupts when trigger GPIO1_26, how i map my GPIO1_26 interrupt to /proc/interrupts file?

Thanks & Regards

Keldy

over 13 years ago

0 Gururaja Hebbar over 13 years ago

TI__Intellectual 2725 points

You have to make use of gpio_request(), gpio_direction_input() and then request for irq on these gpio lines.

kindly refer linux-src/drivers/mmc/host/oma_hsmmc.c for reference. MMC driver uses GPIO pins as IRQ for WP detection

0 Vaibhav Hiremath over 13 years ago

TI__Expert 8180 points

Don't do this...

Try/Check following things,

- Pin mux for GPIO26 - Add entry in board_mux (refer to the file arch/arm/mach-omap2/board-am335xevm.c)

- Use gpio_xxx api's - gpio_request() and gpio_direction_input()

- You must be using irq number returned from gpio_to_irq() in request_irq()

Thanks,

Vaibhav

0 ranchu over 10 years ago in reply to Vaibhav Hiremath

Guru 20755 points

I have same issue,
Is there any simple example ?

Thanks, Ran

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AM335x GPIO interrupt and /proc/interrupts