linux-kernel - Re: [PATCH v4 1/2] dt-bindings: timer: thead,c900-aclint-mtimer: separate mtime and mtimecmp regs

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Date:   Thu, 30 Nov 2023 20:31:31 +0800
From:   Inochi Amaoto <inochiama@...look.com>
To:     Conor Dooley <conor@...nel.org>,
        Anup Patel <apatel@...tanamicro.com>
Cc:     Inochi Amaoto <inochiama@...look.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Chen Wang <unicorn_wang@...look.com>,
        Anup Patel <anup@...infault.org>,
        Samuel Holland <samuel.holland@...ive.com>,
        Guo Ren <guoren@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 1/2] dt-bindings: timer: thead,c900-aclint-mtimer: separate mtime and mtimecmp regs

>On Thu, Nov 30, 2023 at 5:40 PM Conor Dooley <conor@...nel.org> wrote:
>>
>> On Thu, Nov 30, 2023 at 05:18:15PM +0530, Anup Patel wrote:
>>> On Thu, Nov 30, 2023 at 5:15 PM Conor Dooley <conor@...nel.org> wrote:
>>
>>>>> and add separate "riscv" prefixed DT binding for RISC-V mtimer.
>>>>
>>>> Do you know of any users for a "riscv,mtimer" binding that are not
>>>> covered by existing bindings for the clint?
>>>
>>> Ventana Veyron-v1 implements a mtimer per-cluster (or chiplet)
>>> which is compatible to "riscv,mtimer" (i.e. we have both mtime
>>> and mtimecmp MMIO registers).
>>
>> Okay, thanks. I guess iff veyron-v1 DT support shows up (or other
>> similar devices) we can go ahead with a "riscv,mtimer" binding then.
>> I had thought that you guys were going to be using ACPI though, so
>> I guess the "other similar devices" applies.
>
>We use ACPI from EDK2 onwards in our boot-flow. The booting
>stages prior to EDK2 (such as OpenSBI) use DT. In fact, EDK2
>also uses information in DT to populate static parts of the ACPI
>table.
>

Yes, And the EDK2 implement of sg2042 shares the same boot flow, which is
already in the mainline EDK2 repo.

>Regards,
>Anup
>