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Date:   Sun, 20 Feb 2022 10:54:33 +0100
From:   Pavel Machek <>
To:     Sasha Levin <>
        Guo Ren <>,
        Anup Patel <>,
        Marc Zyngier <>,
        Palmer Dabbelt <>,
        Samuel Holland <>,
        Thomas Gleixner <>,,,
Subject: Re: [PATCH AUTOSEL 4.19 03/11] irqchip/sifive-plic: Add missing
 thead,c900-plic match string


> [ 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]:

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

Best regards,

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