linux-kernel - Re: [PATCH v1 2/2] riscv: dts: starfive: add the missing monitor core

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Date:   Wed, 13 Jul 2022 23:15:02 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Conor Dooley <mail@...chuod.ie>,
        Emil Renner Berthing <kernel@...il.dk>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Conor Dooley <conor.dooley@...rochip.com>
Cc:     devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] riscv: dts: starfive: add the missing monitor
 core

在 2022-07-11星期一的 19:43 +0100，Conor Dooley写道：
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> The JH7100 has a 32 bit monitor core that is missing from the device
> tree. Add it (and its cpu-map entry) to more accurately reflect the
> actual topology of the SoC.
> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  arch/riscv/boot/dts/starfive/jh7100.dtsi | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/starfive/jh7100.dtsi
> b/arch/riscv/boot/dts/starfive/jh7100.dtsi
> index c617a61e26e2..92fce5b66d3d 100644
> --- a/arch/riscv/boot/dts/starfive/jh7100.dtsi
> +++ b/arch/riscv/boot/dts/starfive/jh7100.dtsi
> @@ -67,6 +67,23 @@ cpu1_intc: interrupt-controller {
>                         };
>                 };
>  
> +               E24: cpu@2 {
> +                       compatible = "sifive,e24", "riscv";

Oh, by the way "sifive,e24" is not a documented compatible in the DT
binding.

If you really want to add it here, you need to add the compatible
string to the DT binding first.

> +                       reg = <2>;
> +                       device_type = "cpu";
> +                       i-cache-block-size = <32>;
> +                       i-cache-sets = <256>;
> +                       i-cache-size = <16384>;
> +                       riscv,isa = "rv32imafc";
> +                       status = "disabled";
> +
> +                       cpu2_intc: interrupt-controller {
> +                               compatible = "riscv,cpu-intc";
> +                               interrupt-controller;
> +                               #interrupt-cells = <1>;
> +                       };
> +               };
> +
>                 cpu-map {
>                         cluster0 {
>                                 core0 {
> @@ -76,6 +93,10 @@ core0 {
>                                 core1 {
>                                         cpu = <&U74_1>;
>                                 };
> +
> +                               core2 {
> +                                       cpu = <&E24>;
> +                               };
>                         };
>                 };
>         };