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

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Date:   Wed, 13 Jul 2022 15:16:45 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <icenowy@...c.io>, <kernel@...il.dk>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <paul.walmsley@...ive.com>,
        <palmer@...belt.com>, <aou@...s.berkeley.edu>,
        <anup@...infault.org>, <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

On 13/07/2022 16:15, Icenowy Zheng wrote:
> 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.

Check patch 1/2.

> 
>> +                       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>;
>> +                               };
>>                         };
>>                 };
>>         };
> 
>