[PATCH] dt-bindings: serial: 8250: Add Exar compatibles

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The Intel IXP425 Vulcan board has an Exar XR16L2551 8250-compatible.
It works like an 8250 but it is always good to specify exactly which
component we are using. This allows us to specify:

compatible = "exar,xr16l2551", "ns8250";

Put in some sibling Exar serial compatibles while we're at it.

Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 Documentation/devicetree/bindings/serial/8250.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
index a0bf061b80fe..fa767440f281 100644
--- a/Documentation/devicetree/bindings/serial/8250.yaml
+++ b/Documentation/devicetree/bindings/serial/8250.yaml
@@ -64,6 +64,12 @@ properties:
       - const: nuvoton,npcm750-uart
       - const: nvidia,tegra20-uart
       - const: nxp,lpc3220-uart
+      - items:
+          - enum:
+              - exar,xr16l2552
+              - exar,xr16l2551
+              - exar,xr16l2550
+          - const: ns8250
       - items:
           - enum:
               - altr,16550-FIFO32
-- 
2.31.1




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