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From: guoren@kernel.org
To: guoren@kernel.org, anup@brainfault.org, maz@kernel.org,
	tglx@linutronix.de, palmer@dabbelt.com, samuel@sholland.org
Cc: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	devicetree@vger.kernel.org, Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V7 2/2] irqchip/sifive-plic: Fixup thead,c900-plic DT parse missing
Date: Sun, 30 Jan 2022 21:56:34 +0800	[thread overview]
Message-ID: <20220130135634.1213301-3-guoren@kernel.org> (raw)
In-Reply-To: <20220130135634.1213301-1-guoren@kernel.org>

From: Guo Ren <guoren@linux.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@linux.alibaba.com>
Cc: Anup Patel <anup@brainfault.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Samuel Holland <samuel@sholland.org>
Cc: Thomas Gleixner <tglx@linutronix.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


WARNING: multiple messages have this Message-ID (diff)
From: guoren@kernel.org
To: guoren@kernel.org, anup@brainfault.org, maz@kernel.org,
	tglx@linutronix.de, palmer@dabbelt.com, samuel@sholland.org
Cc: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	devicetree@vger.kernel.org, Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V7 2/2] irqchip/sifive-plic: Fixup thead, c900-plic DT parse missing
Date: Sun, 30 Jan 2022 21:56:34 +0800	[thread overview]
Message-ID: <20220130135634.1213301-3-guoren@kernel.org> (raw)
In-Reply-To: <20220130135634.1213301-1-guoren@kernel.org>

From: Guo Ren <guoren@linux.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@linux.alibaba.com>
Cc: Anup Patel <anup@brainfault.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Samuel Holland <samuel@sholland.org>
Cc: Thomas Gleixner <tglx@linutronix.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


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  parent reply	other threads:[~2022-01-30 13:57 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-30 13:56 [PATCH V7 0/2] Add thead,c900-plic support guoren
2022-01-30 13:56 ` guoren
2022-01-30 13:56 ` [PATCH V7 1/2] dt-bindings: update riscv plic compatible string guoren
2022-01-30 13:56   ` guoren
2022-02-02  1:00   ` Rob Herring
2022-02-02  1:00     ` Rob Herring
2022-02-02 10:53   ` [irqchip: irq/irqchip-fixes] " irqchip-bot for Guo Ren
2022-01-30 13:56 ` guoren [this message]
2022-01-30 13:56   ` [PATCH V7 2/2] irqchip/sifive-plic: Fixup thead, c900-plic DT parse missing guoren
2022-02-02  4:42   ` [PATCH V7 2/2] irqchip/sifive-plic: Fixup thead,c900-plic " Samuel Holland
2022-02-02  4:42     ` Samuel Holland
2022-02-07  9:13     ` Guo Ren
2022-02-07  9:13       ` Guo Ren
2022-02-02 10:53   ` [irqchip: irq/irqchip-fixes] irqchip/sifive-plic: Add missing thead,c900-plic match string irqchip-bot for Guo Ren

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