[PATCH] dt-bindings: serial: 8250: add marvell,armada-38x-uart compatible

[Rosen Penev <rosenp@gmail.com>]

The Armada 38x and 98DX3236 SoCs use this compatible, either paired
with "ns16550a" (armada-38x.dtsi) or on its own
(armada-xp-98dx3236.dtsi). Neither form is covered by the 8250
binding, so dtbs_check reports:

  serial@12000: failed to match any schema with compatible:
  ['marvell,armada-38x-uart', 'ns16550a']

Add a standalone const entry and a two-string variant paired with
"ns16550a".

Validated with make dt_binding_check (8250.yaml) and dt-validate on
armada-38x and armada-xp 98DX3236 boards: the UART schema errors are
gone.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 Documentation/devicetree/bindings/serial/8250.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
index 8c2c177faf89..f71c6afe02f2 100644
--- a/Documentation/devicetree/bindings/serial/8250.yaml
+++ b/Documentation/devicetree/bindings/serial/8250.yaml
@@ -109,6 +109,7 @@ properties:
       - const: aspeed,ast2500-vuart
       - const: intel,xscale-uart
       - const: mrvl,pxa-uart
+      - const: marvell,armada-38x-uart
       - const: nuvoton,wpcm450-uart
       - const: nuvoton,npcm750-uart
       - const: nvidia,tegra20-uart
@@ -119,6 +120,9 @@ properties:
               - exar,xr16l2551
               - exar,xr16l2550
           - const: ns8250
+      - items:
+          - const: marvell,armada-38x-uart
+          - const: ns16550a
       - items:
           - enum:
               - altr,16550-FIFO32
-- 
2.55.0