On Thu, Oct 3, 2013 at 12:44 PM, <thloh.linux@xxxxxxxxx> wrote: > From: Tien Hock Loh <thloh@xxxxxxxxxx> > > Add driver support for Altera GPIO soft IP, including interrupts and I/O. > Tested on Altera CV SoC board using dipsw and LED using LED framework. > > Signed-off-by: Tien Hock Loh <thloh@xxxxxxxxxx> > --- > .../devicetree/bindings/gpio/gpio-altera.txt | 34 ++ This driver adds device tree bindings and need to be CC: devicetree@xxxxxxxxxxxxxxx on subsequent postings. It will not be merged until a DT person ACKs it. > +++ b/Documentation/devicetree/bindings/gpio/gpio-altera.txt > @@ -0,0 +1,34 @@ > +Altera GPIO controller bindings > + > +Required properties: > +- compatible: > + - "altr,pio-1.0" > +- reg: Physical base address and length of the controller's registers. > +- #gpio-cells : Should be 1 > + - first cell is the gpio offset number > +- gpio-controller : Marks the device node as a GPIO controller. > +- #interrupt-cells : Should be 1. > +- interrupts: Specify the interrupt. > +- interrupt-controller: Mark the device node as an interrupt controller > + The first cell is the local interrupt offset number to the GPIO controller. > + > +Altera GPIO specific properties: > +- width: Width of the GPIO bank, range from 1-32 > +- interrupt_trigger: Specifies the interrupt trigger type the GPIO hardware is > + synthesized. This field is required if the Altera GPIO controller used has > + IRQ enabled as the interrupt type is not software controlled, but hardware > + synthesized. Ah yeah I remember this thing! :-) (...) > +static int altera_gpio_to_irq(struct gpio_chip *gc, unsigned offset) > +{ > + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); > + struct altera_gpio_chip *altera_gc = container_of(mm_gc, > + struct altera_gpio_chip, mmchip); > + > + if (altera_gc->irq == 0) > + return -ENXIO; Just write it like this: if (!altera_gc->irq) > + if ((altera_gc->irq && offset) < altera_gc->mmchip.gc.ngpio) This makes no sense. && is boolean logical AND. The expression to the left of "<" will be 0 or 1. > + return irq_create_mapping(altera_gc->irq, offset); > + else > + return -ENXIO; > +} (...) > + > +static void altera_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) > +{ > + struct altera_gpio_chip *altera_gc = irq_desc_get_handler_data(desc); > + struct irq_chip *chip = irq_desc_get_chip(desc); > + struct of_mm_gpio_chip *mm_gc = &altera_gc->mmchip; > + unsigned long status; > + > + int base; Do you have to call this variable "base"? It's quite confusing for me, can't you just call it "i"? > +int altera_gpio_probe(struct platform_device *pdev) > +{ (...) > + struct device_node *node = pdev->dev.of_node; > + if (of_get_property(node, "interrupts", ®) == NULL) > + goto skip_irq; > + altera_gc->mapped_irq = irq_of_parse_and_map(node, 0); I think this IRQ has already been added to the pdev as a resource by the OF core code, and you'r redoing the work of the core here. Doesn't this work: irq = platform_get_irq(dev, 0); ? > + if (altera_gc->mapped_irq == NO_IRQ) > + goto skip_irq; Do not reference NO_IRQ, it is always 0 these days. Just do this: if (!altera_gc->mapped_irq) Apart from this it is starting to look real good! Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html