linux-kernel - Re: [PATCH v3 03/12] of: add J-Core interrupt controller bindings

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Date:	Wed, 25 May 2016 19:08:31 -0400
From:	Rich Felker <dalias@...c.org>
To:	Mark Rutland <mark.rutland@....com>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-sh@...r.kernel.org,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Kumar Gala <galak@...eaurora.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 03/12] of: add J-Core interrupt controller bindings

On Wed, May 25, 2016 at 11:25:04AM +0100, Mark Rutland wrote:
> On Wed, May 25, 2016 at 05:43:03AM +0000, Rich Felker wrote:
> > Signed-off-by: Rich Felker <dalias@...c.org>
> > ---
> >  .../bindings/interrupt-controller/jcore,aic.txt    | 29 ++++++++++++++++++++++
> >  1 file changed, 29 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/jcore,aic.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/jcore,aic.txt b/Documentation/devicetree/bindings/interrupt-controller/jcore,aic.txt
> > new file mode 100644
> > index 0000000..5dc99b9
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/jcore,aic.txt
> > @@ -0,0 +1,29 @@
> > +J-Core Advanced Interrupt Controller
> > +
> > +Required properties:
> > +
> > +- compatible : Should be "jcore,aic1" for the (obsolete) first-generation aic
> > +  with 8 interrupt lines with programmable priorities, or "jcore,aic2" for
> > +  the "aic2" core with 64 interrupts.
> > +
> > +- reg : Memory region for configuration.
> > +
> > +- interrupt-controller : Identifies the node as an interrupt controller
> > +
> > +- #interrupt-cells : Specifies the number of cells needed to encode an
> > +  interrupt source. The value shall be 1.
> > +
> > +Optional properties:
> > +
> > +- cpu-offset : For SMP, the offset to the per-cpu memory region for
> > +  configuration, to be scaled by the cpu number.
> 
> I take is that "cpu number" means the "sequential, zero-based hardware
> cpu id" defined in patch 2. I would recommend that you explicitly
> mention that (e.g. here say "hardware cpu id" rather than "cpu number"),
> so as to not have this confused with Linux logical IDs.

OK. The current arch/sh SMP framework only has nominal support for hw
cpuid != logical cpuid; it's not actually used/usable right now. But
the DT binding spec should be clear on this anyway.

Rich