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

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Date:   Sun, 30 Jan 2022 21:56:34 +0800
From:   guoren@...nel.org
To:     guoren@...nel.org, anup@...infault.org, maz@...nel.org,
        tglx@...utronix.de, palmer@...belt.com, samuel@...lland.org
Cc:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        devicetree@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH V7 2/2] irqchip/sifive-plic: Fixup thead,c900-plic DT parse missing

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(+)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 259065d271ef..09cc98266d30 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 */
-- 
2.25.1