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Date:   Sun, 20 Feb 2022 10:54:33 +0100
From:   Pavel Machek <pavel@....cz>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>,
        Anup Patel <anup@...infault.org>,
        Marc Zyngier <maz@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Samuel Holland <samuel@...lland.org>,
        Thomas Gleixner <tglx@...utronix.de>, paul.walmsley@...ive.com,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH AUTOSEL 4.19 03/11] irqchip/sifive-plic: Add missing
 thead,c900-plic match string

Hi!

> [ Upstream commit 1d4df649cbb4b26d19bea38ecff4b65b10a1bbca ]
> 
> The thead,c900-plic has been used in opensbi to distinguish
> PLIC [1]. Although PLICs have the same behaviors in Linux,
> they are different hardware with some custom initializing in
> firmware(opensbi).
> 
> Qute opensbi patch commit-msg by Samuel:
> 
>   The T-HEAD PLIC implementation requires setting a delegation bit
>   to allow access from S-mode. Now that the T-HEAD PLIC has its own
>   compatible string, set this bit automatically from the PLIC driver,
>   instead of reaching into the PLIC's MMIO space from another driver.
> 
> [1]: https://github.com/riscv-software-src/opensbi/commit/78c2b19218bd62653b9fb31623a42ced45f38ea6
>

The "thead,c900-plic" string is added into single place in the
kernel. This means that a) it will probably not do anything useful in
-stable kernels and b) it is certainly missing documentation etc.

In mainline, string is documented in
Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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