linux-kernel - Re: [PATCH 3/3] dt-bindings: riscv: sifive: Add SiFive Private L2 cache controller

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Date:   Fri, 16 Jun 2023 12:45:09 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Eric Lin <eric.lin@...ive.com>, conor@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        palmer@...belt.com, paul.walmsley@...ive.com,
        aou@...s.berkeley.edu, maz@...nel.org, chenhuacai@...nel.org,
        baolu.lu@...ux.intel.com, will@...nel.org,
        kan.liang@...ux.intel.com, nnac123@...ux.ibm.com,
        pierre.gondois@....com, huangguangbin2@...wei.com, jgross@...e.com,
        chao.gao@...el.com, maobibo@...ngson.cn,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dslin1010@...il.com
Cc:     Zong Li <zong.li@...ive.com>, Nick Hu <nick.hu@...ive.com>
Subject: Re: [PATCH 3/3] dt-bindings: riscv: sifive: Add SiFive Private L2
 cache controller

On 16/06/2023 08:32, Eric Lin wrote:
> This add YAML DT binding documentation for SiFive Private L2
> cache controller
> 
> Signed-off-by: Eric Lin <eric.lin@...ive.com>
> Reviewed-by: Zong Li <zong.li@...ive.com>
> Reviewed-by: Nick Hu <nick.hu@...ive.com>
> ---
>  .../bindings/riscv/sifive,pL2Cache0.yaml      | 81 +++++++++++++++++++
>  1 file changed, 81 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/riscv/sifive,pL2Cache0.yaml
> 
> diff --git a/Documentation/devicetree/bindings/riscv/sifive,pL2Cache0.yaml b/Documentation/devicetree/bindings/riscv/sifive,pL2Cache0.yaml
> new file mode 100644
> index 000000000000..b5d8d4a39dde
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/riscv/sifive,pL2Cache0.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (C) 2023 SiFive, Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/riscv/sifive,pL2Cache0.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: SiFive Private L2 Cache Controller
> +
> +maintainers:
> +  - Greentime Hu  <greentime.hu@...ive.com>
> +  - Eric Lin      <eric.lin@...ive.com>
> +
> +description:
> +  The SiFive Private L2 Cache Controller is per hart and communicates with both the upstream
> +  L1 caches and downstream L3 cache or memory, enabling a high-performance cache subsystem.
> +  All the properties in ePAPR/DeviceTree specification applies for this platform.

Drop the last sentence. Why specification would not apply?

> +
> +allOf:
> +  - $ref: /schemas/cache-controller.yaml#
> +
> +select:
> +  properties:
> +    compatible:
> +      contains:
> +        enum:
> +          - sifive,pL2Cache0
> +          - sifive,pL2Cache
> +
> +  required:
> +    - compatible
> +
> +properties:
> +  compatible:
> +    items:


You have only one item, so no need for items... unless you just missed
proper fallback.

> +      - enum:
> +          - sifive,pL2Cache0
> +          - sifive,pL2Cache1

What is "0" and "1" here? What do these compatibles represent? Why they
do not have any SoC related part?

> +
> +  cache-block-size:
> +    const: 64
> +
> +  cache-level:
> +    const: 2
> +
> +  cache-sets:
> +    const: 512
> +
> +  cache-size:
> +    const: 262144

Are you sure? So all private L2 cache controllers will have fixed size
of cache?

> +
> +  cache-unified: true
> +
> +  reg:
> +    maxItems: 1
> +
> +  next-level-cache: true
> +
> +additionalProperties: false
> +
> +required:

required: goes before additionalProperties:.


Best regards,
Krzysztof