linux-kernel - Re: [PATCH V7 2/2] irqchip/sifive-plic: Fixup thead,c900-plic DT parse missing

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Date:   Tue, 1 Feb 2022 22:42:39 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     guoren@...nel.org
Cc:     anup@...infault.org, maz@...nel.org, tglx@...utronix.de,
        palmer@...belt.com, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V7 2/2] irqchip/sifive-plic: Fixup thead,c900-plic DT
 parse missing

On 1/30/22 7:56 AM, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
> 
> 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
> 
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> Cc: Anup Patel <anup@...infault.org>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Palmer Dabbelt <palmer@...belt.com>
> Cc: Samuel Holland <samuel@...lland.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> ---
>  drivers/irqchip/irq-sifive-plic.c | 1 +
>  1 file changed, 1 insertion(+)

Tested-by: Samuel Holland <samuel@...lland.org>