linux-kernel - Re: [PATCH 1/1] dt-bindings: reg-io-width for SiFive CLINT

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Date:   Sun, 17 Oct 2021 15:54:38 +0800
From:   Xiang W <wxjstz@....com>
To:     Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Guo Ren <guoren@...ux.alibaba.com>, Bin Meng <bmeng.cn@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Atish Patra <atish.patra@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Anup Patel <anup.patel@....com>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        opensbi@...ts.infradead.org
Subject: Re: [PATCH 1/1] dt-bindings: reg-io-width for SiFive CLINT

在 2021-10-15星期五的 12:09 +0200，Heinrich Schuchardt写道：
> The CLINT in the T-HEAD 9xx processors do not support 64bit mmio
> access to
> the MTIMER device. The current schema does not allow to specify this.
> 
> OpenSBI currently uses a property 'clint,has-no-64bit-mmio' to
> indicate the
> restriction. Samuael Holland suggested in
> lib: utils/timer: Use standard property to specify 32-bit I/O
> https://github.com/smaeul/opensbi/commit/b95e9cf7cf93b0af16fc89204378bc59ff30008e
> to use "reg-io-width = <4>;" as the reg-io-width property is
> generally used
> in the devicetree schema for such a condition.
> 
> A release candidate of the ACLINT specification is available at
> https://github.com/riscv/riscv-aclint/releases
> 
> Add reg-io-width as optional property to the SiFive Core Local
> Interruptor.
> 
> Signed-off-by: Heinrich Schuchardt
> <heinrich.schuchardt@...onical.com>
> ---
>  Documentation/devicetree/bindings/timer/sifive,clint.yaml | 7
> +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git
> a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> index a35952f48742..266012d887b5 100644
> --- a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> @@ -41,6 +41,13 @@ properties:
>    reg:
>      maxItems: 1
>  
> +  reg-io-width:
> +    description: |
> +      Some CLINT implementations, e.g. on the T-HEAD 9xx, only
> support
> +      32bit access for MTIMER.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    const: 4
> +
>    interrupts-extended:
>      minItems: 1
>  
I think we can move has_64bit_mmio to fdt_match->data.This way we no
longer rely on 'clint, has-no-64bit-mmio' or 'reg-io-width'

Regards,
Xiang W