On Mon, Mar 30, 2009 at 9:57 AM, Yann Pelletier <ypellet...@haivision.com> wrote: > > Hi, > I'd like to add supports for interrupts handling from GPIO controller. Some > of these interrupts are from I2C devices and some others are from SPI devices. > > What is the best approach to enable interrupts handling for those devices > through GPIO.
Modify the GPIO driver to also be a cascaded IRQ driver (see http://patchwork.ozlabs.org/patch/21914/ for an example). > Also, > > # cat /proc/interrupts > CPU0 > 16: 60 IPIC Level serial > 17: 0 IPIC Level fpga > 18: 4 IPIC Level mpc83xx_spi > 21: 0 IPIC Level i2c-mpc > 22: 7 IPIC Level i2c-mpc > > According to my platform device tree, serial irq should be on int9, SPI on > int16 and i2c on int14,15. This causes me some problems as I need int18 to > map to external IRQ2. These numbers are *Linux internal* virtual irq numbers. They have no relation to the physical IRQ number for each interrupt controller. Just make sure your Device Tree maps the IRQs correctly and you'll be okay. g. -- Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
