linux-kernel - Re: [PATCH 13/36] dt-bindings: arm: Convert PMU binding to json-schema

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Date:   Thu, 1 Nov 2018 14:32:14 -0500
From:   Rob Herring <robh@...nel.org>
To:     Will Deacon <will.deacon@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Grant Likely <glikely@...retlab.ca>,
        Kumar Gala <kumar.gala@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
        Mark Brown <broonie@...nel.org>, Tom Rini <trini@...sulko.com>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH 13/36] dt-bindings: arm: Convert PMU binding to json-schema

On Tue, Oct 9, 2018 at 6:57 AM Will Deacon <will.deacon@....com> wrote:
>
> Hi Rob,
>
> On Fri, Oct 05, 2018 at 11:58:25AM -0500, Rob Herring wrote:
> > Convert ARM PMU binding to DT schema format using json-schema.
> >
> > Cc: Will Deacon <will.deacon@....com>
> > Cc: Mark Rutland <mark.rutland@....com>
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Cc: devicetree@...r.kernel.org
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> >  Documentation/devicetree/bindings/arm/pmu.txt | 70 --------------
> >  .../devicetree/bindings/arm/pmu.yaml          | 96 +++++++++++++++++++
> >  2 files changed, 96 insertions(+), 70 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/arm/pmu.txt
> >  create mode 100644 Documentation/devicetree/bindings/arm/pmu.yaml
>
> [...]
>
> > -- interrupts : 1 combined interrupt or 1 per core. If the interrupt is a per-cpu
> > -               interrupt (PPI) then 1 interrupt should be specified.
>
> [...]
>
> > +  interrupts:
> > +    oneOf:
> > +      - maxItems: 1
> > +      - minItems: 2
> > +        maxItems: 8
> > +        description: 1 interrupt per core.
> > +
> > +  interrupts-extended:
> > +    $ref: '#/properties/interrupts'
>
> This seems like a semantic different between the two representations, or am
> I missing something here? Specifically, both the introduction of
> interrupts-extended and also dropping any mention of using a single per-cpu
> interrupt (the single combined case is no longer support by Linux; not sure
> if you want to keep it in the binding).

In regards to no support for the single combined interrupt, it looks
like Marvell Armada SoCs at least (armada-375 is what I'm looking at)
have only a single interrupt. Though the interrupt gets routed to MPIC
which then has a GIC PPI. So it isn't supported or happens to work
still since it is a PPI?

Rob