linux-kernel - Re: [PATCH v2 1/2] dt-bindings: riscv: Add optional DT property riscv,timer-can-wake-cpu

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Message-ID: <372e37bf-ac90-c371-ad9e-b9c18e1cc059@linaro.org>
Date:   Wed, 27 Jul 2022 14:07:50 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Anup Patel <apatel@...tanamicro.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Andrew Jones <ajones@...tanamicro.com>,
        Atish Patra <atishp@...shpatra.org>,
        Samuel Holland <samuel@...lland.org>,
        Anup Patel <anup@...infault.org>, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: riscv: Add optional DT property
 riscv,timer-can-wake-cpu

On 27/07/2022 13:43, Anup Patel wrote:
> We add an optional DT property riscv,timer-can-wake-cpu which if present
> in CPU DT node then CPU timer is always powered-on and never loses context.
> 
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> ---
>  Documentation/devicetree/bindings/riscv/cpus.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
> index d632ac76532e..b60b64b4113a 100644
> --- a/Documentation/devicetree/bindings/riscv/cpus.yaml
> +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
> @@ -78,6 +78,12 @@ properties:
>        - rv64imac
>        - rv64imafdc
>  
> +  riscv,timer-can-wake-cpu:
> +    type: boolean
> +    description:
> +      If present, the timer interrupt can wake up the CPU from
> +      suspend/idle state.

Isn't this a property of a timer, not CPU? IOW, your timer node should
have "wakeup-source" property.

Now that's actual problem: why the RISC-V timer is bound to "riscv"
compatible, not to dedicated timer node? How is it related to actual CPU
(not SoC)?


Best regards,
Krzysztof