* [PATCH AUTOSEL 5.4 04/17] irqchip/sifive-plic: Add missing thead, c900-plic match string
[not found] <20220215153037.581579-1-sashal@kernel.org>
@ 2022-02-15 15:30 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2022-02-15 15:30 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Guo Ren, Anup Patel, Marc Zyngier, Palmer Dabbelt, Samuel Holland,
Thomas Gleixner, Sasha Levin, paul.walmsley, aou, linux-riscv
From: Guo Ren <guoren@linux.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@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>
Tested-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220130135634.1213301-3-guoren@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.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 7cd7b140dfe97..9dad45d928bfe 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -313,3 +313,4 @@ 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
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