From: Guo Ren <guoren@linux.alibaba.com> stable inclusion from stable-v5.10.102 commit 1ab48248573b486d8ee4d9cb07545844548b9ba4 bugzilla: https://gitee.com/openeuler/kernel/issues/I567K6 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ 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/78c2b19218bd62653b9fb31... 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> Signed-off-by: Yu Liao <liaoyu15@huawei.com> Reviewed-by: Wei Li <liwei391@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- 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 926e55d838cb..bd99ee0ae433 100644 --- a/drivers/irqchip/irq-sifive-plic.c +++ b/drivers/irqchip/irq-sifive-plic.c @@ -400,3 +400,4 @@ 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 */ -- 2.20.1