linux-kernel - Re: [PATCH v2 2/2] dt-bindings: perf: starfive: Add StarLink PMU

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Date:   Tue, 14 Nov 2023 17:57:15 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>
Cc:     Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ley Foon Tan <leyfoon.tan@...rfivetech.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt-bindings: perf: starfive: Add StarLink PMU

On Tue, Nov 14, 2023 at 10:12:54AM +0800, Ji Sheng Teoh wrote:
> Add device tree binding for StarFive's StarLink PMU (Performance
> Monitor Unit).
> 
> Signed-off-by: Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>
> ---
>  .../bindings/perf/starfive,starlink-pmu.yaml  | 46 +++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/perf/starfive,starlink-pmu.yaml
> 
> diff --git a/Documentation/devicetree/bindings/perf/starfive,starlink-pmu.yaml b/Documentation/devicetree/bindings/perf/starfive,starlink-pmu.yaml
> new file mode 100644
> index 000000000000..b164f6849055
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/perf/starfive,starlink-pmu.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/perf/starfive,starlink-pmu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: StarFive StarLink PMU
> +
> +maintainers:
> +  - Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>
> +
> +description:
> +  StarFive's StarLink PMU integrates one or more CPU cores with a shared L3
> +  memory system. The PMU support overflow interrupt, up to 16 programmable
> +  64bit event counters, and an independent 64bit cycle counter.
> +  StarLink PMU is accessed via MMIO.
> +
> +properties:
> +  compatible:
> +    const: starfive,starlink-pmu

This compatible (in isolation) is far too generic. Please add a device
specific compatible for the device that has this PMU.

Thanks,
Conor.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        l3_pmu: pmu@...00000 {
> +            compatible = "starfive,starlink-pmu";
> +            reg = <0x0 0x12900000 0x0 0x10000>;
> +            interrupts = <34>;
> +        };
> +    };
> -- 
> 2.25.1
> 

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