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

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Date:   Wed, 20 Sep 2023 13:58:21 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Inochi Amaoto <inochiama@...look.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        aou@...s.berkeley.edu, chao.wei@...hgo.com,
        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>
Subject: Re: [PATCH v2 06/11] dt-bindings: timer: Add Sophgo sg2042 clint

On Wed, Sep 20, 2023 at 08:40:07PM +0800, Inochi Amaoto wrote:
> >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

Yeah, this is the unfortunate problem of half-baked bindings (IMO)
ending up in OpenSBI (which likely means they also ended up in QEMU).
This T-Head stuff is coming across our (metaphorical) desks, so we are
obviously going to try to do things correctly. I may end up speaking to
Anup later today, if I do I will point him at this thread (if he hasn't
seen it already).

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