> Message: 7 > Date: Mon, 30 Mar 2009 10:32:17 -0600 > From: Grant Likely <grant.lik...@secretlab.ca> > Subject: > To: Yann Pelletier <ypellet...@haivision.com> > Cc: "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org> > Message-ID: > <fa686aa40903300932p2c92110g2907bb7bf80d...@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > 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). >
I've looked at the patch but I wonder if this would be applicable to the MPC8313. If my understanding is good, in the MPC52xx you have 8 gpio only interrupts and 8 gpio/gpt. With the MPC8313, each GPIO can act as an interrupt but they are all muxed to only 1 interrupt in the IPIC. So I'm concern about making the GPIO controller act as an interrupt controller. > > 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. > This is good now, thanks > 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
