linux-kernel - Re: [PATCH v2 06/11] dt-bindings: timer: Add Sophgo sg2042 clint

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Date:   Wed, 20 Sep 2023 09:50:53 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Chen Wang <unicornxw@...il.com>
CC:     <aou@...s.berkeley.edu>, <chao.wei@...hgo.com>, <conor@...nel.org>,
        <devicetree@...r.kernel.org>, <emil.renner.berthing@...onical.com>,
        <guoren@...nel.org>, <jszhang@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <palmer@...belt.com>, <paul.walmsley@...ive.com>,
        <robh+dt@...nel.org>, <xiaoguang.xing@...hgo.com>,
        Inochi Amaoto <inochiama@...look.com>,
        Chen Wang <wangchen20@...as.ac.cn>
Subject: Re: [PATCH v2 06/11] dt-bindings: timer: Add Sophgo sg2042 clint

On Wed, Sep 20, 2023 at 02:39:39PM +0800, Chen Wang wrote:
> From: Inochi Amaoto <inochiama@...look.com>
> 
> Add two new compatible string formatted like `C9xx-clint-xxx` to identify
> the timer and ipi device separately, and do not allow c900-clint as the
> fallback to avoid conflict.
> 
> Signed-off-by: Inochi Amaoto <inochiama@...look.com>
> Signed-off-by: Chen Wang <wangchen20@...as.ac.cn>

Have you ignored Krzysztof's comments on this? I don't see a response or
a reaction to his comments about the compatibles on the last version.
Additionally, where is the user for these? I don't see any drivers that
actually make use of these.

Why do you need to have 2 compatibles (and therefore 2 devices) for the
clint? I thought the clint was a single device, of which the mtimer and
mswi bits were just "features"? Having split register ranges isn't a
reason to have two compatibles, so I must be missing something here...

Thanks,
Conor.

> ---
>  Documentation/devicetree/bindings/timer/sifive,clint.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/timer/sifive,clint.yaml b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> index a0185e15a42f..ae69696c5c75 100644
> --- a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> @@ -39,6 +39,14 @@ properties:
>                - allwinner,sun20i-d1-clint
>                - thead,th1520-clint
>            - const: thead,c900-clint
> +      - items:
> +          - enum:
> +              - sophgo,sg2042-clint-mtimer
> +          - const: thead,c900-clint-mtimer
> +      - items:
> +          - enum:
> +              - sophgo,sg2042-clint-mswi
> +          - const: thead,c900-clint-mswi
>        - items:
>            - const: sifive,clint0
>            - const: riscv,clint0
> -- 
> 2.25.1
> 

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