[PATCH V4 3/9] dt-bindings: serial: fsl-lpuart: Add imx8ulp compatible string

["Peng Fan (OSS)" <peng.fan@xxxxxxxxxxx>]

From: Jacky Bai <ping.bai@xxxxxxx>

The lpuart on i.MX8ULP is derived from i.MX7ULP, it uses two compatible
strings, so update the compatible string for i.MX8ULP.

Reviewed-by: Dong Aisheng <aisheng.dong@xxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Jacky Bai <ping.bai@xxxxxxx>
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
 - v4 changes:
   no

 - v3 changes:
   no

 - v2 changes:
   refine the commit messages

 Documentation/devicetree/bindings/serial/fsl-lpuart.yaml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml b/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
index a90c971b4f1f..e7ac63dd1469 100644
--- a/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
+++ b/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
@@ -22,7 +22,9 @@ properties:
           - fsl,imx7ulp-lpuart
           - fsl,imx8qm-lpuart
       - items:
-          - const: fsl,imx8qxp-lpuart
+          - enum:
+              - fsl,imx8qxp-lpuart
+              - fsl,imx8ulp-lpuart
           - const: fsl,imx7ulp-lpuart
 
   reg:
-- 
2.25.1