Re: [PATCH v3 4/5] gpio: gpiolib: Add ngirq member to struct gpio_irq_chip

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Wed, May 11, 2022 at 8:32 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> wrote:

> Supported GPIO IRQs by the chip is not always equal to the number of GPIO
> pins. For example on Renesas RZ/G2L SoC where it has GPIO0-122 pins but at
> a give point a maximum of only 32 GPIO pins can be used as IRQ lines in
> the IRQC domain.
>
> This patch adds ngirq member to struct gpio_irq_chip and passes this as a
> size to irq_domain_create_hierarchy()/irq_domain_create_simple() if it is
> being set in the driver otherwise fallbacks to using ngpio.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>

As Geert says, I think you can just use .valid_mask for this,
what do you say?

Yours,
Linus Walleij