The UART controller on Loongson 3A4000 is compatible with Loongson
2K1500, which is NS16550A-compatible with an additional fractional
frequency divisor register.

Add loongson,ls3a4000-uart as compatible with loongson,ls2k1500-uart.

Signed-off-by: Rong Zhang <rongrong@oss.cipunited.com>
---
 Documentation/devicetree/bindings/serial/8250.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
index 73851f19330d..1d1f2a22776c 100644
--- a/Documentation/devicetree/bindings/serial/8250.yaml
+++ b/Documentation/devicetree/bindings/serial/8250.yaml
@@ -179,6 +179,7 @@ properties:
           - const: ns16550a
       - items:
           - enum:
+              - loongson,ls3a4000-uart
               - loongson,ls3a5000-uart
               - loongson,ls3a6000-uart
               - loongson,ls2k2000-uart
-- 
2.53.0

On Sun, Mar 15, 2026 at 07:41:41AM +0800, Rong Zhang wrote:
> The UART controller on Loongson 3A4000 is compatible with Loongson
> 2K1500, which is NS16550A-compatible with an additional fractional
> frequency divisor register.
> 
> Add loongson,ls3a4000-uart as compatible with loongson,ls2k1500-uart.
> 
> Signed-off-by: Rong Zhang <rongrong@oss.cipunited.com>
> ---
>  Documentation/devicetree/bindings/serial/8250.yaml | 1 +
>  1 file changed, 1 insertion(+)

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof