Re: [PATCH v2 1/5] dt-bindings: interrupt-controller: Add Renesas RZ/A1 Interrupt Controller

[Geert Uytterhoeven]

Hi Rob,

On Tue, Apr 30, 2019 at 5:03 PM Rob Herring <robh+dt@xxxxxxxxxx> wrote:
> On Tue, Apr 30, 2019 at 7:13 AM Geert Uytterhoeven
> <geert+renesas@xxxxxxxxx> wrote:
> >
> > Add DT bindings for the Renesas RZ/A1 Interrupt Controller.
> >
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> > ---
> > v2:
> >   - Add "renesas,gic-spi-base",
> >   - Document RZ/A2M.

> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/renesas,rza1-irqc.txt
> > @@ -0,0 +1,30 @@
> > +DT bindings for the Renesas RZ/A1 Interrupt Controller
> > +
> > +The RZ/A1 Interrupt Controller is a front-end for the GIC found on Renesas
> > +RZ/A1 and RZ/A2 SoCs:
> > +  - IRQ sense select for 8 external interrupts, 1:1-mapped to 8 GIC SPI
> > +    interrupts,
> > +  - NMI edge select.
> > +
> > +Required properties:
> > +  - compatible: Must be "renesas,<soctype>-irqc", and "renesas,rza1-irqc" as
> > +               fallback.
> > +               Examples with soctypes are:
> > +                 - "renesas,r7s72100-irqc" (RZ/A1H)
> > +                 - "renesas,r7s9210-irqc" (RZ/A2M)
> > +  - #interrupt-cells: Must be 2 (an interrupt index and flags, as defined
> > +                                in interrupts.txt in this directory)
> > +  - interrupt-controller: Marks the device as an interrupt controller
> > +  - reg: Base address and length of the memory resource used by the interrupt
> > +         controller
> > +  - renesas,gic-spi-base: Lowest GIC SPI interrupt number this block maps to.
>
> Why isn't this just an 'interrupts' property? Plus, without

Because Marc told me this is what everyone uses...

> 'interrupts' walking the hierarchy is broken.

What is "interrupts walking"? Can you please elaborate?

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds