在 2023-05-08星期一的 02:23 +0800，Jisheng Zhang写道：
> The T-HEAD's C910 PLIC still needs the delegation bit settingto allow
> access from S-mode, but it doesn't need the edge quirk.
No, the PLIC controller seems to be the same between C906 and C910,
which has level/edge selectable via external signal.
See openc906 and openc910 repositories, especially the documents with
it: 玄铁C9{06,10}集成手册.pdf .
In addition, such problem won't arise when the system uses only level-
triggered interrupts.
>
> Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
> ---
> .../bindings/interrupt-controller/sifive,plic-1.0.0.yaml | 4
> ++++
> drivers/irqchip/irq-sifive-plic.c | 1 +
> 2 files changed, 5 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/interrupt-
> controller/sifive,plic-1.0.0.yaml
> b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-
> 1.0.0.yaml
> index f75736a061af..64b43a3c3748 100644
> --- a/Documentation/devicetree/bindings/interrupt-
> controller/sifive,plic-1.0.0.yaml
> +++ b/Documentation/devicetree/bindings/interrupt-
> controller/sifive,plic-1.0.0.yaml
> @@ -62,6 +62,10 @@ properties:
> - starfive,jh7110-plic
> - canaan,k210-plic
> - const: sifive,plic-1.0.0
> + - items:
> + - enum:
> + - thead,light-plic
> + - const: thead,c910-plic
> - items:
> - enum:
> - allwinner,sun20i-d1-plic
> diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-
> sifive-plic.c
> index e1484905b7bd..71afa2a584d9 100644
> --- a/drivers/irqchip/irq-sifive-plic.c
> +++ b/drivers/irqchip/irq-sifive-plic.c
> @@ -569,6 +569,7 @@ static int __init plic_init(struct device_node
> *node,
> }
>
> IRQCHIP_DECLARE(sifive_plic, "sifive,plic-1.0.0", plic_init);
> +IRQCHIP_DECLARE(thead_c910_plic, "thead,c910-plic", plic_init);
> IRQCHIP_DECLARE(riscv_plic0, "riscv,plic0", plic_init); /* for
> legacy systems */
>
> static int __init plic_edge_init(struct device_node *node,
