I just saw that I missed an earlier very useful a suggestion from Grant Likely:
http://ozlabs.org/pipermail/linuxppc-dev/2009-February/068357.html By defining the irq in the dts directly I don't need the gpio irq support anymore. On Thu, Mar 5, 2009 at 12:20 PM, Henk Stegeman <henk.stege...@gmail.com> wrote: > I forgot to include my changes in arch/powerpc/include/asm/gpio.h: > > diff --git a/arch/powerpc/include/asm/gpio.h b/arch/powerpc/include/asm/gpio.h > index ea04632..38762ed 100644 > --- a/arch/powerpc/include/asm/gpio.h > +++ b/arch/powerpc/include/asm/gpio.h > @@ -38,12 +38,9 @@ static inline int gpio_cansleep(unsigned int gpio) > return __gpio_cansleep(gpio); > } > > -/* > - * Not implemented, yet. > - */ > static inline int gpio_to_irq(unsigned int gpio) > { > - return -ENOSYS; > + return __gpio_to_irq(gpio); > } > > static inline int irq_to_gpio(unsigned int irq) > > > On Thu, Mar 5, 2009 at 12:15 PM, Henk Stegeman <henk.stege...@gmail.com> > wrote: >> Hello, >> >> I have an SPI device that sends an IRQ to the CPU (MPC5200) via GPIO (GPT6): >> >> gpt6: ti...@660 { // General Purpose Timer GPT6 in GPIO mode for >> SMC4000IO sample irq. >> compatible = "fsl,mpc5200b-gpt-gpio","fsl,mpc5200-gpt-gpio"; >> cell-index = <6>; >> reg = <0x660 0x10>; >> interrupts = <1 15 0>; >> interrupt-parent = <&mpc5200_pic>; >> gpio-controller; >> #gpio-cells = <2>; >> }; >> >> s...@f00 { >> #address-cells = <1>; >> #size-cells = <0>; >> compatible = "fsl,mpc5200b-spi","fsl,mpc5200-spi"; >> reg = <0xf00 0x20>; >> interrupts = <2 13 0 2 14 0>; >> interrupt-parent = <&mpc5200_pic>; >> gpios = <&gpt4 0 0>; >> >> io-control...@0 { >> compatible = "microkey,smc4000io"; >> linux,modalias = "of_smc4000io"; >> spi-max-frequency = <1000000>; >> spi-cpha; >> reg = <0>; >> // gpios: first is IRQ to cpu >> gpios = <&gpt6 0 0>; >> word-delay-us = <0>; >> }; >> }; >> >> I've got it working for a mm_gpio, but it's probably not the right >> approach, I have the following questions to get to the right solution: >> - Should gpiolib's gpio_to_irq function indeed return the IRQ that was >> specified at the GPIO by the DTS (interrupts = <1 15 0>)? >> The effect is that if the IRQ is not specified in the DTS the >> gpio_to_irq returns NO_IRQ. >> (On the MPC5200 the IRQ is fixed for GPT6, so instead the cell-index >> could also be used to return a gpio's IRQ) >> - If a GPIO controller supports several GPIOs but one IRQ, is it >> defined what gpio_to_irq should return? >> - Is it okay for gpio_to_irq to return NO_IRQ? (returned by >> irq_of_parse_and_map) if irq is not defined? >> >> >> Henk. >> >> diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c >> index 6eea601..81927d7 100644 >> --- a/drivers/of/gpio.c >> +++ b/drivers/of/gpio.c >> @@ -150,6 +150,17 @@ int of_gpio_simple_xlate(struct of_gpio_chip >> *of_gc, struct device_node *np, >> } >> EXPORT_SYMBOL(of_gpio_simple_xlate); >> >> +static int of_mm_gpio_to_irq(struct gpio_chip *gc, unsigned int gpio) >> +{ >> + struct of_mm_gpio_chip *mm_gc; >> + struct of_gpio_chip *of_gc; >> + >> + of_gc = container_of(gc, struct of_gpio_chip, gc); >> + mm_gc = container_of(of_gc, struct of_mm_gpio_chip, of_gc); >> + return mm_gc->irq; >> + >> +} >> + >> /** >> * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank) >> * @np: device node of the GPIO chip >> @@ -188,6 +199,9 @@ int of_mm_gpiochip_add(struct device_node *np, >> >> gc->base = -1; >> >> + mm_gc->irq = irq_of_parse_and_map(np, 0); >> + gc->to_irq = of_mm_gpio_to_irq; >> + >> if (!of_gc->xlate) >> of_gc->xlate = of_gpio_simple_xlate; >> >> diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h >> index fc2472c..17fe9ed 100644 >> --- a/include/linux/of_gpio.h >> +++ b/include/linux/of_gpio.h >> @@ -54,6 +54,7 @@ struct of_mm_gpio_chip { >> struct of_gpio_chip of_gc; >> void (*save_regs)(struct of_mm_gpio_chip *mm_gc); >> void __iomem *regs; >> + int irq; >> }; >> >> static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip >> *gc) >> > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
