linux-kernel - Re: [PATCH 1/2] RISC-V: Update l2 cache DT documentation to add support for SiFive FU740

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Message-ID: <20201121125443.GA2076465@robh.at.kernel.org>
Date:   Sat, 21 Nov 2020 06:54:43 -0600
From:   Rob Herring <robh@...nel.org>
To:     Yash Shah <yash.shah@...ive.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, Jonathan.Cameron@...wei.com, wsa@...nel.org,
        sam@...nborg.org, sagar.kadam@...ive.com, anup@...infault.org,
        bp@...e.de, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        sachin.ghadi@...ive.com
Subject: Re: [PATCH 1/2] RISC-V: Update l2 cache DT documentation to add
 support for SiFive FU740

On Thu, Nov 12, 2020 at 02:41:13PM +0530, Yash Shah 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.
> 
> Signed-off-by: Yash Shah <yash.shah@...ive.com>
> ---
>  .../devicetree/bindings/riscv/sifive-l2-cache.yaml | 33 +++++++++++++++++-----
>  1 file changed, 26 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml b/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
> index efc0198..4873d5c 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:
> @@ -51,12 +54,6 @@ properties:
>  
>    cache-unified: true
>  
> -  interrupts:
> -    description: |
> -      Must contain entries for DirError, DataError and DataFail signals.
> -    minItems: 3
> -    maxItems: 3

Keep this here and just change maxItems to 4. Really, what each 
interrupt is should be listed out as an 'items' entry.

> -
>    reg:
>      maxItems: 1
>  
> @@ -67,6 +64,28 @@ 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.
> +      minItems: 3
> +      maxItems: 3

Here you just need 'maxItems: 3'.

> +
> +else:
> +  properties:
> +    interrupts:
> +      description: |
> +        Must contain entries for DirError, DirFail, DataError, DataFail signals.

DirFail should be last so you keep the same indices.

> +      minItems: 4
> +      maxItems: 4

And 'minItems: 4'

> +
>  additionalProperties: false
>  
>  required:
> -- 
> 2.7.4
>