linux-kernel - Re: [PATCH 5/5] dt-bindings: timer: Add CLINT bindings

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Date:   Fri, 22 May 2020 02:29:36 -0400
From:   Sean Anderson <seanga2@...il.com>
To:     Anup Patel <anup@...infault.org>
Cc:     Anup Patel <anup.patel@....com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Rob Herring <robh+dt@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        devicetree@...r.kernel.org, Damien Le Moal <damien.lemoal@....com>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Atish Patra <atish.patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 5/5] dt-bindings: timer: Add CLINT bindings

On 5/22/20 1:54 AM, Anup Patel wrote:
> On Fri, May 22, 2020 at 1:35 AM Sean Anderson <seanga2@...il.com> wrote:
>>
>> On 5/21/20 9:45 AM, Anup Patel wrote:
>>> +Required properties:
>>> +- compatible : "sifive,clint-1.0.0" and a string identifying the actual
>>> +  detailed implementation in case that specific bugs need to be worked around.
>>
>> Should the "riscv,clint0" compatible string be documented here? This
> 
> Yes, I forgot to add this compatible string. I will add in v2.
> 
>> peripheral is not really specific to sifive, as it is present in most
>> rocket-chip cores.
> 
> I agree that CLINT is present in a lot of non-SiFive RISC-V SOCs and
> FPGAs but this IP is only documented as part of SiFive FU540 SOC.
> (Refer, https://static.dev.sifive.com/FU540-C000-v1.0.pdf)
> 
> The RISC-V foundation should host the CLINT spec independently
> under https://github.com/riscv and make CLINT spec totally open.
> 
> For now, I have documented it just like PLIC DT bindings found at:
> Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.txt

The PLIC seems to have its own RISC-V-sponsored documentation [1] which
was split off from the older privileged specs. By your logic above,
should it be renamed to riscv,plic0.txt (with a corresponding change in
the documented compatible strings)?

[1] https://github.com/riscv/riscv-plic-spec

> 
> If RISC-V maintainers agree then I will document it as "RISC-V CLINT".
> 
> @Palmer ?? @Paul ??
> 
> Regards,
> Anup
> 

--Sean