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SubjectRe: [PATCH 2/2] pinctrl: at91-pio4: Use platform_get_irq_optional() to get the interrupt
Hi Alexandre,

Thank you for the review.

On Fri, Dec 24, 2021 at 3:03 PM Alexandre Belloni
<alexandre.belloni@bootlin.com> wrote:
>
> On 24/12/2021 14:57:48+0000, Lad Prabhakar wrote:
> > platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> > allocation of IRQ resources in DT core code, this causes an issue
> > when using hierarchical interrupt domains using "interrupts" property
> > in the node as this bypasses the hierarchical setup and messes up the
> > irq chaining.
> >
> > In preparation for removal of static setup of IRQ resource from DT core
> > code use platform_get_irq_optional().
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > drivers/pinctrl/pinctrl-at91-pio4.c | 14 ++++++--------
> > 1 file changed, 6 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
> > index fafd1f55cba7..ebfb106be97d 100644
> > --- a/drivers/pinctrl/pinctrl-at91-pio4.c
> > +++ b/drivers/pinctrl/pinctrl-at91-pio4.c
> > @@ -1045,7 +1045,6 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
> > const char **group_names;
> > const struct of_device_id *match;
> > int i, ret;
> > - struct resource *res;
> > struct atmel_pioctrl *atmel_pioctrl;
> > const struct atmel_pioctrl_data *atmel_pioctrl_data;
> >
> > @@ -1164,16 +1163,15 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
> >
> > /* There is one controller but each bank has its own irq line. */
> > for (i = 0; i < atmel_pioctrl->nbanks; i++) {
> > - res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
> > - if (!res) {
> > + ret = platform_get_irq_optional(pdev, i);
>
> I don't think the irq should be optional here.
>
The only difference between platform_get_irq() and
platform_get_irq_optional() is that platform_get_irq() prints an error
message in case of error. Since we are already printing an sane error
message "missing irq resource for group %c\n" in the driver I've
chosen platform_get_irq_optional() instead platform_get_irq().

Let me know if you want me to drop platform_get_irq_optional() and use
platform_get_irq() instead, in that case I'll also drop the error
message "missing irq resource for group %c\n" from the driver.

Cheers,
Prabhakar

> > + if (ret < 0) {
> > dev_err(dev, "missing irq resource for group %c\n",
> > 'A' + i);
> > - return -EINVAL;
> > + return ret;
> > }
> > - atmel_pioctrl->irqs[i] = res->start;
> > - irq_set_chained_handler_and_data(res->start,
> > - atmel_gpio_irq_handler, atmel_pioctrl);
> > - dev_dbg(dev, "bank %i: irq=%pr\n", i, res);
> > + atmel_pioctrl->irqs[i] = ret;
> > + irq_set_chained_handler_and_data(ret, atmel_gpio_irq_handler, atmel_pioctrl);
> > + dev_dbg(dev, "bank %i: irq=%d\n", i, ret);
> > }
> >
> > atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
> > --
> > 2.17.1
> >
>
> --
> Alexandre Belloni, co-owner and COO, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com

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