Re: [PATCH v4 3/7] gpio: gpiolib: Add ngirq member to struct gpio_irq_chip

[Lad, Prabhakar]

Hi Linus,

Thank you for the review.

On Thu, May 19, 2022 at 2:26 PM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:
>
> On Wed, May 18, 2022 at 9:30 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 given 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>
>
> NAK
>
> As pointed out this is a property of the hardware and thus you should
> derive this property of the hardware from the compatible string.
>
> For example by passing per-variant .data in struct of_device_id.
>
> Unique hardware properties means unique hardware means it should
> have a unique compatible string. Otherwise something is wrong
> with the compatibles.
>
Agreed, I will drop this.

Cheers,
Prabhakar