linux-kernel - [PATCH AUTOSEL 5.15 07/33] irqchip/sifive-plic: Add missing thead,c900-plic match string

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Date:   Tue, 15 Feb 2022 10:28:05 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     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>,
        Sasha Levin <sashal@...nel.org>, paul.walmsley@...ive.com,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.15 07/33] irqchip/sifive-plic: Add missing thead,c900-plic match string

From: Guo Ren <guoren@...ux.alibaba.com>

[ 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

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>
Tested-by: Samuel Holland <samuel@...lland.org>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20220130135634.1213301-3-guoren@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/irqchip/irq-sifive-plic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 259065d271ef0..09cc98266d30f 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -398,3 +398,4 @@ static int __init plic_init(struct device_node *node,
 
 IRQCHIP_DECLARE(sifive_plic, "sifive,plic-1.0.0", plic_init);
 IRQCHIP_DECLARE(riscv_plic0, "riscv,plic0", plic_init); /* for legacy systems */
+IRQCHIP_DECLARE(thead_c900_plic, "thead,c900-plic", plic_init); /* for firmware driver */
-- 
2.34.1