linux-kernel - Re: [PATCH v4 2/4] dt-bindings: interrupt-controller: msi: Add msi-ranges property

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Date:   Tue, 21 Sep 2021 19:52:18 +0200 (CEST)
From:   Mark Kettenis <mark.kettenis@...all.nl>
To:     Rob Herring <robh@...nel.org>
Cc:     devicetree@...r.kernel.org, alyssa@...enzweig.io,
        kettenis@...nbsd.org, tglx@...utronix.de, maz@...nel.org,
        marcan@...can.st, bhelgaas@...gle.com, jim2101024@...il.com,
        nsaenz@...nel.org, f.fainelli@...il.com,
        bcm-kernel-feedback-list@...adcom.com,
        daire.mcnamara@...rochip.com, nsaenzjulienne@...e.de,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pci@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 2/4] dt-bindings: interrupt-controller: msi: Add
 msi-ranges property

> Date: Tue, 31 Aug 2021 16:16:02 -0500
> From: Rob Herring <robh@...nel.org>
> 
> On Fri, Aug 27, 2021 at 07:15:27PM +0200, Mark Kettenis wrote:
> > From: Mark Kettenis <kettenis@...nbsd.org>
> > 
> > Update the MSI controller binding to add an msi-ranges property
> > that specifies how MSIs map onto regular interrupts on some other
> > interrupt controller.
> > 
> > Signed-off-by: Mark Kettenis <kettenis@...nbsd.org>
> > ---
> >  .../bindings/interrupt-controller/msi-controller.yaml     | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/msi-controller.yaml b/Documentation/devicetree/bindings/interrupt-controller/msi-controller.yaml
> > index 5ed6cd46e2e0..bf8b8a7dba09 100644
> > --- a/Documentation/devicetree/bindings/interrupt-controller/msi-controller.yaml
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/msi-controller.yaml
> > @@ -31,4 +31,12 @@ properties:
> >        Identifies the node as an MSI controller.
> >      $ref: /schemas/types.yaml#/definitions/flag
> >  
> > +  msi-ranges:
> > +    description:
> > +      A list of pairs <intid span>, where "intid" is the specification
> 
> It's not really 'pairs' and 'interrupt specifier' is the terminology the 
> spec uses. How about:
> 
> A list of <phandle intspec span>, where "phandle" is parent interrupt 
> controller, "intspec" is the starting/base interrupt specifier, and 
> "span" is the size of that range (typically multiples of 32).
> 
> The 'multiples of 32' part is what Marc told me.

Thanks Rob!  That sounds good.  But 32 is what's typical for the Apple
hardware, and I expect that different hardware that might use this
property will use a different value, so I left that last bit out.  I
also kept the bit that states that multiple ranges are allowed.

> > +      of the first interrupt (including the phandle for the interrupt
> > +      controller) that can be used as an MSI, and "span" the size of
> > +      that range. Multiple ranges can be provided.
> > +    $ref: /schemas/types.yaml#/definitions/phandle-array
> > +
> >  additionalProperties: true
> > -- 
> > 2.32.0
> > 
> > 
>