linux-kernel - Re: [PATCH 08/17] dts: include documentation for the RISC-V interrupt controllers

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Date:   Wed, 7 Jun 2017 14:57:46 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Wesley Terpstra <wesley@...ive.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        Albert Ou <albert@...ive.com>, patches@...ups.riscv.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <Marc.Zyngier@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 08/17] dts: include documentation for the RISC-V interrupt controllers

On Wed, Jun 7, 2017 at 1:57 PM, Wesley Terpstra <wesley@...ive.com> wrote:
> On Wed, Jun 7, 2017 at 3:13 AM, Mark Rutland <mark.rutland@....com> wrote:
>>> > +RISC-V Hart-Level Interrupt Controller (HLIC)
>>> > +---------------------------------------------

[...]

>>> > +       plic: interrupt-controller@...0000 {
>>> > +               #address-cells = <0>;
>>
>> This can go, given you don't have sub-nodes, nor a #size-cells property.
>
> The device-tree-specification seems to indicate that this is mandatory
> for an interrupt-controller. Or have I understood this wrongly? When
> you use interrupts-extended, doesn't it use the address-cells of the
> interrupt controller? We should add that size-cells = 0, though.

It's only needed if you have an interrupt-map property AIUI.
#size-cells should never be needed (unless you have child nodes of
this one).

Rob