linux-kernel - Re: [PATCH v4 1/4] dt-bindings: interrupt-controller: Convert MSI controller to json-schema

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Message-ID: <YS6XpkluSVRIvR6J@robh.at.kernel.org>
Date:   Tue, 31 Aug 2021 15:57:10 -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>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Jim Quinlan <jim2101024@...il.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 1/4] dt-bindings: interrupt-controller: Convert MSI
 controller to json-schema

On Fri, Aug 27, 2021 at 07:15:26PM +0200, Mark Kettenis wrote:
> From: Mark Kettenis <kettenis@...nbsd.org>
> 
> Split the MSI controller bindings from the MSI binding document
> into DT schema format using json-schema.
> 
> Signed-off-by: Mark Kettenis <kettenis@...nbsd.org>
> ---
>  .../interrupt-controller/msi-controller.yaml  | 34 +++++++++++++++++++
>  .../bindings/pci/brcm,stb-pcie.yaml           |  1 +
>  .../bindings/pci/microchip,pcie-host.yaml     |  1 +
>  3 files changed, 36 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/msi-controller.yaml
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/msi-controller.yaml b/Documentation/devicetree/bindings/interrupt-controller/msi-controller.yaml
> new file mode 100644
> index 000000000000..5ed6cd46e2e0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/msi-controller.yaml
> @@ -0,0 +1,34 @@
> +# SPDX-License-Identifier: BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/interrupt-controller/msi-controller.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MSI controller
> +
> +maintainers:
> +  - Marc Zyngier <marc.zyngier@....com>
> +
> +description: |
> +  An MSI controller signals interrupts to a CPU when a write is made
> +  to an MMIO address by some master. An MSI controller may feature a
> +  number of doorbells.
> +
> +properties:
> +  "#msi-cells":
> +    description: |
> +      The number of cells in an msi-specifier, required if not zero.
> +
> +      Typically this will encode information related to sideband data,
> +      and will not encode doorbells or payloads as these can be
> +      configured dynamically.
> +
> +      The meaning of the msi-specifier is defined by the device tree
> +      binding of the specific MSI controller.

I'd prefer we limit this to the maximum range. I'd like to know when 
someone needs 2 cells (or 3000).

enum: [ 0, 1 ]

Though no one seems to use 0 (making it optional was probably a 
mistake...)

> +
> +  msi-controller:
> +    description:
> +      Identifies the node as an MSI controller.
> +    $ref: /schemas/types.yaml#/definitions/flag

dependencies:
  "#msi-cells": [ msi-controller ]

> +
> +additionalProperties: true
> diff --git a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> index b9589a0daa5c..5c67976a8dc2 100644
> --- a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> @@ -88,6 +88,7 @@ required:
>  
>  allOf:
>    - $ref: /schemas/pci/pci-bus.yaml#
> +  - $ref: ../interrupt-controller/msi-controller.yaml#

/schemas/interrupt-controller/msi-controller.yaml#

>    - if:
>        properties:
>          compatible:
> diff --git a/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
> index fb95c276a986..684d9d036f48 100644
> --- a/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
> +++ b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
> @@ -11,6 +11,7 @@ maintainers:
>  
>  allOf:
>    - $ref: /schemas/pci/pci-bus.yaml#
> +  - $ref: ../interrupt-controller/msi-controller.yaml#
>  
>  properties:
>    compatible:
> -- 
> 2.32.0
> 
>