linux-kernel - Re: [PATCH v3 1/2] dt-bindings: riscv: Update l2 cache DT documentation to add support for SiFive FU740

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Date:   Thu, 10 Dec 2020 17:55:23 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     yash.shah@...ive.com
CC:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        devicetree@...r.kernel.org, bp@...e.de, anup@...infault.org,
        Jonathan.Cameron@...wei.com, wsa@...nel.org, sam@...nborg.org,
        aou@...s.berkeley.edu, Paul Walmsley <paul.walmsley@...ive.com>,
        robh+dt@...nel.org, sagar.kadam@...ive.com,
        sachin.ghadi@...ive.com, yash.shah@...ive.com
Subject:     Re: [PATCH v3 1/2] dt-bindings: riscv: Update l2 cache DT documentation to add support for SiFive FU740

On Thu, 10 Dec 2020 02:28:02 PST (-0800), yash.shah@...ive.com wrote:
> The L2 cache controller in SiFive FU740 has 4 ECC interrupt sources as
> compared to 3 in FU540. Update the DT documentation accordingly with
> "compatible" and "interrupt" property changes.

This generally looks good to me, but I'd prefer to get an ack from the DT folks
as I do frequently miss stuff in the bindings.

Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@...gle.com>

>
> Signed-off-by: Yash Shah <yash.shah@...ive.com>
> ---
>  .../devicetree/bindings/riscv/sifive-l2-cache.yaml | 34 +++++++++++++++++++---
>  1 file changed, 30 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml b/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
> index efc0198..6a576dc 100644
> --- a/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
> +++ b/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
> @@ -27,6 +27,7 @@ select:
>        items:
>          - enum:
>              - sifive,fu540-c000-ccache
> +            - sifive,fu740-c000-ccache
>
>    required:
>      - compatible
> @@ -34,7 +35,9 @@ select:
>  properties:
>    compatible:
>      items:
> -      - const: sifive,fu540-c000-ccache
> +      - enum:
> +          - sifive,fu540-c000-ccache
> +          - sifive,fu740-c000-ccache
>        - const: cache
>
>    cache-block-size:
> @@ -52,10 +55,13 @@ properties:
>    cache-unified: true
>
>    interrupts:
> -    description: |
> -      Must contain entries for DirError, DataError and DataFail signals.
>      minItems: 3
> -    maxItems: 3
> +    maxItems: 4
> +    items:
> +      - description: DirError interrupt
> +      - description: DataError interrupt
> +      - description: DataFail interrupt
> +      - description: DirFail interrupt
>
>    reg:
>      maxItems: 1
> @@ -67,6 +73,26 @@ properties:
>        The reference to the reserved-memory for the L2 Loosely Integrated Memory region.
>        The reserved memory node should be defined as per the bindings in reserved-memory.txt.
>
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        const: sifive,fu540-c000-ccache
> +
> +then:
> +  properties:
> +    interrupts:
> +      description: |
> +        Must contain entries for DirError, DataError and DataFail signals.
> +      maxItems: 3
> +
> +else:
> +  properties:
> +    interrupts:
> +      description: |
> +        Must contain entries for DirError, DataError, DataFail, DirFail signals.
> +      minItems: 4
> +
>  additionalProperties: false
>
>  required: