linux-kernel - Re: [PATCH v2] dt-bindings: timer: Add SiFive CLINT2

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Message-ID: <20250314232518.GA2513550-robh@kernel.org>
Date: Fri, 14 Mar 2025 18:25:18 -0500
From: Rob Herring <robh@...nel.org>
To: Nick Hu <nick.hu@...ive.com>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Samuel Holland <samuel.holland@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Anup Patel <anup@...infault.org>, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2] dt-bindings: timer: Add SiFive CLINT2

On Fri, Mar 14, 2025 at 04:12:54PM +0800, Nick Hu wrote:
> Add compatible string and property for the SiFive CLINT v2.

Conor asked about being backwards compatible with v1. Please say why it 
isn't here.

> 
> Signed-off-by: Nick Hu <nick.hu@...ive.com>
> Reviewed-by: Samuel Holland <samuel.holland@...ive.com>
> ---
> - v2 changes:
>   - Don't allow sifive,clint2 by itself. Add '-{}' to the first entry
>   - Mark the sifive,fine-ctr-bits as the required property when
>     the compatible includes the sifive,clint2
> 
>  .../bindings/timer/sifive,clint.yaml          | 20 +++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/timer/sifive,clint.yaml b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> index 76d83aea4e2b..4b9dad11c1e9 100644
> --- a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> @@ -36,6 +36,10 @@ properties:
>                - starfive,jh7110-clint   # StarFive JH7110
>                - starfive,jh8100-clint   # StarFive JH8100
>            - const: sifive,clint0        # SiFive CLINT v0 IP block
> +      - items:
> +          - {}
> +          - const: sifive,clint2        # SiFive CLINT v2 IP block
> +        description: SiFive CLINT v2 is the HRT that supports the Zicntr
>        - items:
>            - enum:
>                - allwinner,sun20i-d1-clint
> @@ -62,6 +66,22 @@ properties:
>      minItems: 1
>      maxItems: 4095
>  
> +  sifive,fine-ctr-bits:
> +    maximum: 15
> +    description: The width in bits of the fine counter.
> +
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        const: sifive,clint2
> +then:
> +  required:
> +    - sifive,fine-ctr-bits
> +else:
> +  properties:
> +    sifive,fine-ctr-bits: false
> +
>  additionalProperties: false
>  
>  required:
> -- 
> 2.17.1
>