[PATCH v5 3/5] mfd: airoha: Add support for Airoha EN7581 MFD

[Linus Walleij]

On Thu, Oct 10, 2024 at 11:41 PM Lorenzo Bianconi <lorenzo at kernel.org> wrote:
> > On Thu, Oct 10, 2024 at 12:14 PM Christian Marangi <ansuelsmth at gmail.com> wrote:

> > I think you want a separate GPIO node inside the system controller:
> >
> >   en7581_gpio: gpio {
> >          compatible = "airhoa,en7581-gpio";
> >          interrupt-parent = <&gic>;
> >          interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
> >
> >          gpio-controller;
> >          #gpio-cells = <2>;
> >
> >          interrupt-controller;
> >          #interrupt-cells = <2>;
> >
> >          gpio-ranges = <&en7581_pinctrl 0 13 47>;
> > };
>
> So far I implemented the gpio functionalities in the en7581 pinctrl driver
> (as it is done for other mtk pinctrl drivers) but I am fine to reuse the
> gpio-en7523 driver for it. Do you prefer this second approach?

It's fine to combine GPIO and pin control into the same node, especially
if you will have a combined driver for it, then it's more or less mandatory.
I only wrote this looking at ansuel's sketch.

> > This will make subdevices probe and you can put the pure GPIO
> > driver in drivers/gpio/gpio-en7581.c
>
> We could actually reuse gpio-en7523 driver (removing the gpio part from en7581
> pinctrl driver) and extend it to support irq_chip. I do not have a strong
> opinion about it.

Code reuse is always preferred, if possible.

Yours,
Linus Walleij