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

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Date:   Tue, 31 Aug 2021 16:16:02 -0500
From:   Rob Herring <robh@...nel.org>
To:     Mark Kettenis <mark.kettenis@...all.nl>
Cc:     devicetree@...r.kernel.org, alyssa@...enzweig.io,
        Mark Kettenis <kettenis@...nbsd.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Hector Martin <marcan@...can.st>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jim Quinlan <jim2101024@...il.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        Saenz Julienne <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

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.

> +      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
> 
>