[irqchip: irq/irqchip-fixes] irqchip/sifive-plic: Add missing thead,c900-plic match string

[irqchip-bot for Guo Ren]

The following commit has been merged into the irq/irqchip-fixes branch of irqchip:

Commit-ID:     1d4df649cbb4b26d19bea38ecff4b65b10a1bbca
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/1d4df649cbb4b26d19bea38ecff4b65b10a1bbca
Author:        Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
AuthorDate:    Sun, 30 Jan 2022 21:56:34 +08:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Wed, 02 Feb 2022 10:49:29 

irqchip/sifive-plic: Add missing thead,c900-plic match string

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@xxxxxxxxxxxxxxxxx>
Cc: Anup Patel <anup@xxxxxxxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Samuel Holland <samuel@xxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Samuel Holland <samuel@xxxxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220130135634.1213301-3-guoren@xxxxxxxxxx
---
 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 259065d..09cc982 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -398,3 +398,4 @@ out_free_priv:
 
 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 */