What irq number is GPIO20 ?

lujunn723 New Member Posts: 4
Hi, guys!
I am still working in mcp2515 module. I'm tring to make a little kernel module which is need add irq number.
I searched forum and get a code like "gpio_to_irq(?)". I connect the irq pin to Up board GPIO20(Linux GPIO is 25), and what should i change the "?"