On Wed, 2014-12-24 at 03:04 -0800, Joe Perches wrote:
> On Wed, 2014-12-24 at 00:22 -0800, thloh@xxxxxxxxxx wrote:
> > Adds a new driver for Altera soft GPIO IP. The driver is able to
> > do read/write and allows GPIO to be a interrupt controller.
>
> Some trivial comments, some not quite so trivial.
>
> > diff --git a/drivers/gpio/gpio-altera.c b/drivers/gpio/gpio-altera.c
> []
> > +static int altera_gpio_irq_set_type(struct irq_data *d,
> > + unsigned int type)
> > +{
> > + struct altera_gpio_chip *altera_gc = irq_data_get_irq_chip_data(d);
> > +
> > + altera_gc = irq_data_get_irq_chip_data(d);
>
> I presume this multiple initialization of altera_gc
> is unnecessary duplication.
I'll remove this.
>
> > +static void altera_gpio_irq_edge_handler(unsigned int irq,
> > + struct irq_desc *desc)
> > +{
> > + struct altera_gpio_chip *altera_gc;
> > + struct irq_chip *chip;
> > + struct of_mm_gpio_chip *mm_gc;
> > + unsigned long status;
> > + int i;
> > +
> > + altera_gc = irq_desc_get_handler_data(desc);
> > + chip = irq_desc_get_chip(desc);
> > + mm_gc = &altera_gc->mmchip;
> > +
> > + chained_irq_enter(chip, desc);
> > +
> > + while ((status =
> > + (readl(mm_gc->regs + ALTERA_GPIO_EDGE_CAP) &
> > + readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK)))) {
> > + writel(status, mm_gc->regs + ALTERA_GPIO_EDGE_CAP);
> > + for_each_set_bit(i, &status, mm_gc->gc.ngpio) {
> > + generic_handle_irq(
> > + irq_find_mapping(altera_gc->mmchip.gc.irqdomain
> > + , i));
>
> That's kind of unpleasant to read.
> It might be better to use a separate these statements
> and use a temporary for irq_find_mapping()
>
OK I'll fix it.
> > +static void altera_gpio_irq_leveL_high_handler(unsigned int irq,
> > + struct irq_desc *desc)
> > +{
> > + struct altera_gpio_chip *altera_gc;
> > + struct irq_chip *chip;
> > + struct of_mm_gpio_chip *mm_gc;
> > + unsigned long status;
> > + int i;
> > +
> > + altera_gc = irq_desc_get_handler_data(desc);
> > + chip = irq_desc_get_chip(desc);
> > + mm_gc = &altera_gc->mmchip;
> > +
> > + chained_irq_enter(chip, desc);
> > +
> > + status = readl(mm_gc->regs + ALTERA_GPIO_DATA);
> > + status &= readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
> > +
> > + for_each_set_bit(i, &status, mm_gc->gc.ngpio) {
> > + generic_handle_irq(
> > + irq_find_mapping(altera_gc->mmchip.gc.irqdomain, i));
>
> Maybe a temporary here too
>
Yup
> > +int altera_gpio_probe(struct platform_device *pdev)
> > +{
> > + struct device_node *node = pdev->dev.of_node;
> > + int id, reg, ret;
> > + struct altera_gpio_chip *altera_gc;
> > +
> > + altera_gc = devm_kzalloc(&pdev->dev, sizeof(*altera_gc), GFP_KERNEL);
> > +
> > + if (altera_gc == NULL)
> > + return -ENOMEM;
>
> No blank line after the devm_kzalloc please and
> if (!altera_gc)
> is more common.
>
>
OK noted.
> > + if (altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH) {
> > + gpiochip_set_chained_irqchip(&altera_gc->mmchip.gc,
> > + &altera_irq_chip,
> > + altera_gc->mapped_irq,
> > + altera_gpio_irq_leveL_high_handler);
> > + } else {
> > + gpiochip_set_chained_irqchip(&altera_gc->mmchip.gc,
> > + &altera_irq_chip,
> > + altera_gc->mapped_irq,
> > + altera_gpio_irq_edge_handler);
> > + }
>
> Sometimes using a ?: ternary is smaller code
>
> gpiochip_set_chained_irqchip(&altera_gc->mmchip.gc,
> &altera_irq_chip,
> altera_gc->mapped_irq,
> altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH ?
> altera_gpio_irq_leveL_high_handler :
> altera_gpio_irq_edge_handler);
> >
>
Yup I'll fix it.
Regards,
Tien Hock Loh
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