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

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Message-ID: <IA1PR20MB49536BFE1254ADEE0E795A26BBF9A@IA1PR20MB4953.namprd20.prod.outlook.com>
Date:   Wed, 20 Sep 2023 20:40:07 +0800
From:   Inochi Amaoto <inochiama@...look.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     aou@...s.berkeley.edu, chao.wei@...hgo.com, conor@...nel.org,
        evicetree@...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, Chen Wang <wangchen20@...as.ac.cn>,
        Inochi Amaoto <inochiama@...look.com>
Subject: Re: [PATCH v2 06/11] dt-bindings: timer: Add Sophgo sg2042 clint

>On 20/09/2023 14:15, Inochi Amaoto wrote:
>>> On 20/09/2023 08:39, 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
>>>
>>> Why?
>>>
>>
>> If use the same compatible, SBI will process this twice in both ipi and
>> timer, use different compatible will allow SBI to treat these as different.
>> AFAIK, the aclint in SBI use the same concepts, which make hard to use the
>> second register range. I have explained in another response.
>
>What is a SBI? Linux driver? If so, why some intermediate Linux driver
>choice should affect bindings?
>Best regards,
>Krzysztof
>

SBI (Supervisor Binary Interface) is defined by riscv, which is an interface
between the Supervisor Execution Environment (SEE) and the supervisor. The
detailed documentation can be found in [1].

The implement of SBI needs fdt info of the platform, which is provided by
kernel. So we need a dt-bindings for these devices, and these will be
processed by SBI.

[1] https://github.com/riscv-non-isa/riscv-sbi-doc