linux-kernel - Re: [PATCH 1/2] dt-bindings: interrupt-controller: arm,gic-v3: Add dma-noncoherent property

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Message-ID: <20230905182320.GA3744871-robh@kernel.org>
Date:   Tue, 5 Sep 2023 13:23:20 -0500
From:   Rob Herring <robh@...nel.org>
To:     Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>,
        Fang Xiang <fangxiang3@...omi.com>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH 1/2] dt-bindings: interrupt-controller: arm,gic-v3: Add
 dma-noncoherent property

On Tue, Sep 05, 2023 at 12:47:20PM +0200, Lorenzo Pieralisi wrote:
> The GIC v3 specifications allow redistributors and ITSes interconnect
> ports used to access memory to be wired up in a way that makes the
> respective initiators/memory observers non-coherent.
> 
> Add the standard dma-noncoherent property to the GICv3 bindings to
> allow firmware to describe the redistributors/ITSes components and
> interconnect ports behaviour in system designs where the redistributors
> and ITSes are not coherent with the CPU.
> 
> Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
> Cc: Rob Herring <robh@...nel.org>
> ---
>  .../bindings/interrupt-controller/arm,gic-v3.yaml         | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml
> index 39e64c7f6360..0a81ae4519a6 100644
> --- a/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml
> +++ b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml
> @@ -106,6 +106,10 @@ properties:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      maximum: 4096
>  
> +  dma-noncoherent:
> +    description: |

Don't need the '|' if no formatting to preserve.

> +      Present if the GIC redistributors are not cache coherent with the CPU.
> +
>    msi-controller:
>      description:
>        Only present if the Message Based Interrupt functionality is
> @@ -193,6 +197,10 @@ patternProperties:
>        compatible:
>          const: arm,gic-v3-its
>  
> +      dma-noncoherent:
> +        description: |
> +          Present if the GIC ITS is not cache coherent with the CPU.
> +
>        msi-controller: true
>  
>        "#msi-cells":
> -- 
> 2.34.1
>