linux-kernel - Re: [PATCH V3 1/2] dt-bindings: update riscv plic compatible string

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Date:   Wed, 13 Oct 2021 23:21:05 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Guo Ren <guoren@...nel.org>,
        Heiko Stübner <heiko@...ech.de>
Cc:     Anup Patel <anup@...infault.org>,
        Atish Patra <atish.patra@....com>,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Palmer Dabbelt <palmer@...belt.com>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Guo Ren <guoren@...ux.alibaba.com>,
        Rob Herring <robh@...nel.org>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: Re: [PATCH V3 1/2] dt-bindings: update riscv plic compatible string

On 10/13/21 7:49 AM, Guo Ren wrote:
>>>>>>>>        - const: sifive,plic-1.0.0
>>>>>>>
>>>>>>> The PLIC DT node requires two compatible string:
>>>>>>> <implementation_compat>, <spec_compat>
>>>>>>>
>>>>>>> The C9xx PLIC is not RISC-V PLIC so, the DT node should
>>>>>>> be: "thead,c900-plic", "thead,c9xx-plic"
>>>>>>>
>>>>>>> You need to change "- const: sifive,plic-1.0.0" to
>>>>>>> - enum:
>>>>>>>     - sifive,plic-1.0.0
>>>>>>>     - thead,c9xx-plic
>>
>> isn't XuanTie the series containing the c906 and c910?
> XuanTie contain two CPU series:
> riscv: c906, c910
> csky: c807, c810, c860
> 
>> So maybe
>>         thead,xuantie-plic
>> for the spec compatible.
>>
>> So doing in full
>>         compatible = "thead,c906-plic", "thead,xuantie-plic"
> How about:
> compatible = "allwinner,d1-plic", "thead,c900-plic"

To follow the <family>-<soc>-<device> pattern of existing Allwinner
compatibles, the first string should be "allwinner,sun20i-d1-plic".
Otherwise, this looks to me like the right thing to do.

Regards,
Samuel