Re: [PATCH v12 3/4] soc: microchip: add mpfs gpio interrupt mux driver

[Linus Walleij]

On Wed, Mar 11, 2026 at 4:18 PM Conor Dooley <conor@xxxxxxxxxx> wrote:

> From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
>
> On PolarFire SoC there are more GPIO interrupts than there are interrupt
> lines available on the PLIC, and a runtime configurable mux is used to
> decide which interrupts are assigned direct connections to the PLIC &
> which are relegated to sharing a line.
>
> Add a driver so that Linux can set the mux based on the interrupt
> mapping in the devicetree.
>
> Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

Reviewed-by: Linus Walleij <linusw@xxxxxxxxxx>

We need a piece of accessible documentation that clearly defines
the difference between an IRQ mux and a hierarchical IRQ chip.
If only a post on people.kernel.org, just something to help people
to know when to use which approach.

Yours,
Linus Walleij