linux-kernel - Re: [PATCH 1/7] dt-bindings: interrupt-controller: Add bcm2712 MSI-X DT bindings

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Date: Fri, 28 Jun 2024 16:05:21 -0600
From: Rob Herring <robh@...nel.org>
To: Stanimir Varbanov <svarbanov@...e.de>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Jim Quinlan <jim2101024@...il.com>,
	Nicolas Saenz Julienne <nsaenz@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>, kw@...ux.com,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Andrea della Porta <andrea.porta@...e.com>,
	Phil Elwell <phil@...pberrypi.com>,
	Jonathan Bell <jonathan@...pberrypi.com>
Subject: Re: [PATCH 1/7] dt-bindings: interrupt-controller: Add bcm2712 MSI-X
 DT bindings

On Wed, Jun 26, 2024 at 01:45:38PM +0300, Stanimir Varbanov wrote:
> Adds DT bindings for bcm2712 MSI-X interrupt peripheral controller.
> 
> Signed-off-by: Stanimir Varbanov <svarbanov@...e.de>
> ---
>  .../brcm,bcm2712-msix.yaml                    | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2712-msix.yaml
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2712-msix.yaml b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2712-msix.yaml
> new file mode 100644
> index 000000000000..ca610e4467d9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2712-msix.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/interrupt-controller/brcm,bcm2712-msix.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Broadcom bcm2712 MSI-X Interrupt Peripheral support
> +
> +maintainers:
> +  - Stanimir Varbanov <svarbanov@...e.de>
> +
> +description: >
> +  This interrupt controller is used to provide intterupt vectors to the

typo

> +  generic interrupt controller (GIC) on bcm2712. It will be used as
> +  external MSI-X controller for PCIe root complex.
> +
> +allOf:
> +  - $ref: /schemas/interrupt-controller/msi-controller.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - "brcm,bcm2712-mip-intc"

Don't need quotes. Nor 'items'. And enum can be 'const' 

> +  reg:
> +    maxItems: 1
> +    description: >
> +      Specifies the base physical address and size of the registers

drop. That's *every* reg property.

> +
> +  interrupt-controller: true
> +
> +  "#interrupt-cells":
> +    const: 2
> +
> +  msi-controller: true

Add #msi-cells. The default is 0, but that's legacy.

> +
> +  brcm,msi-base-spi:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The SGI number that MSIs start.
> +
> +  brcm,msi-num-spis:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The number of SGIs for MSIs.
> +
> +  brcm,msi-offset:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Shift the allocated MSIs up by N.

If only we had a property that every MSI controller seems to need. Go 
check msi-controller.yaml...

> +
> +  brcm,msi-pci-addr:
> +    $ref: /schemas/types.yaml#/definitions/uint64
> +    description: MSI-X message address.

Why don't other platforms need something like this?

> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupt-controller
> +  - "#interrupt-cells"
> +  - msi-controller
> +
> +examples:
> +  - |
> +    msi-controller@...000 {
> +      compatible = "brcm,bcm2712-mip-intc";
> +      reg = <0x00130000 0xc0>;
> +      msi-controller;
> +      interrupt-controller;
> +      #interrupt-cells = <2>;
> +      brcm,msi-base-spi = <128>;
> +      brcm,msi-num-spis = <64>;
> +      brcm,msi-offset = <0>;
> +      brcm,msi-pci-addr = <0xff 0xfffff000>;
> +    };
> -- 
> 2.43.0
>