[PATCH 1/5] riscv: aclint_ipi: Support T-Head C900 CLINT

[Yao Zi]

Although timer component of the CLINT isn't fully compatible with the
generic RISC-V ACLINT, the IPI component behaves the same.

As the CLINT doesn't have corresponding riscv_aclint_timer driver
available, let's try looking for a compatible SYSCON device directly
when no riscv_aclint_timer device could be found on IPI initialization.

Signed-off-by: Yao Zi <ziyao at disroot.org>
---
 arch/riscv/lib/aclint_ipi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/lib/aclint_ipi.c b/arch/riscv/lib/aclint_ipi.c
index dcd7e5e6b34..1c9a2d70301 100644
--- a/arch/riscv/lib/aclint_ipi.c
+++ b/arch/riscv/lib/aclint_ipi.c
@@ -29,6 +29,10 @@ int riscv_init_ipi(void)
 
 	ret = uclass_get_device_by_driver(UCLASS_TIMER,
 					  DM_DRIVER_GET(riscv_aclint_timer), &dev);
+	if (ret == -ENODEV)
+		ret = uclass_get_device_by_driver(UCLASS_SYSCON,
+						  DM_DRIVER_GET(riscv_aclint_swi), &dev);
+
 	if (ret)
 		return ret;
 
@@ -66,6 +70,7 @@ int riscv_get_ipi(int hart, int *pending)
 
 static const struct udevice_id riscv_aclint_swi_ids[] = {
 	{ .compatible = "riscv,aclint-mswi", .data = RISCV_SYSCON_ACLINT },
+	{ .compatible = "thead,c900-clint", .data = RISCV_SYSCON_ACLINT },
 	{ }
 };
 
-- 
2.49.0