linux-kernel - Re: [PATCH v1 3/6] dt-bindings: cache: Add SiFive Extensible Cache controller

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Date: Sat, 17 Feb 2024 10:09:56 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Samuel Holland <samuel.holland@...ive.com>, Will Deacon
 <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Eric Lin <eric.lin@...ive.com>, Conor Dooley <conor@...nel.org>
Cc: Palmer Dabbelt <palmer@...belt.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Paul Walmsley <paul.walmsley@...ive.com>,
 linux-riscv@...ts.infradead.org, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 3/6] dt-bindings: cache: Add SiFive Extensible Cache
 controller

On 16/02/2024 01:08, Samuel Holland wrote:
> From: Eric Lin <eric.lin@...ive.com>
> 
> Add YAML DT binding documentation for the SiFive Extensible Cache
> controller. The Extensible Cache controller interleaves cache blocks
> across a number of heterogeneous independently-programmed slices. Each
> slice contains an MMIO interface for configuration, cache maintenance,
> error reporting, and performance monitoring.
> 
> +allOf:
> +  - $ref: /schemas/cache-controller.yaml#
> +
> +select:
> +  properties:
> +    compatible:
> +      contains:
> +        enum:
> +          - sifive,extensiblecache0
> +
> +  required:
> +    - compatible
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: sifive,extensiblecache0
> +      - const: cache
> +
> +  "#address-cells": true

const or enum: [1, 2], depending on the addressing you need here.

> +  "#size-cells": true

ditto

> +  ranges: true
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  cache-block-size:
> +    const: 64
> +
> +  cache-level: true

5 is acceptable? I would argue this should be even const.

> +  cache-sets: true
> +  cache-size: true

Some constraints on any of these?

> +  cache-unified: true
> +
> +patternProperties:
> +  "^cache-controller@[0-9a-f]+$":
> +    type: object
> +    additionalProperties: false

What is this object supposed to represent? Add description.

> +    properties:
> +      reg:
> +        maxItems: 1
> +
> +      cache-block-size:
> +        const: 64
> +
> +      cache-sets: true
> +      cache-size: true
> +      cache-unified: true

cache-level

> +
> +      sifive,bm-event-counters:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        default: 0
> +        description: Number of bucket monitor registers in this slice
> +
> +      sifive,cache-ways:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Number of ways in this slice (independent of cache size)
> +
> +      sifive,perfmon-counters:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        default: 0
> +        description: Number of PMU counter registers in this slice
> +
> +    required:
> +      - reg
> +      - cache-block-size
> +      - cache-sets
> +      - cache-size
> +      - cache-unified
> +      - sifive,cache-ways
> +
> +required:
> +  - compatible
> +  - ranges
> +  - interrupts
> +  - cache-block-size
> +  - cache-level
> +  - cache-sets
> +  - cache-size
> +  - cache-unified
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    cache-controller@...40000 {
> +        compatible = "sifive,extensiblecache0", "cache";
> +        ranges = <0x30040000 0x30040000 0x10000>;
> +        interrupts = <0x4>;

You use hex as interrupt numbers on your platforms?

> +        cache-block-size = <0x40>;
> +        cache-level = <3>;
> +        cache-sets = <0x800>;

Best regards,
Krzysztof