[PATCH] dt-bindings: samsung: exynos-usi: Restrict possible samsung,mode values

[Krzysztof Kozlowski]

"samsung,mode" property defines the desired mode of the serial engine
(e.g. I2C or SPI) and only few values are allowed/used by Linux driver.

Cc: Ivaylo Ivanov <ivo.ivanov.ivanov1 at gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>
---
 Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml b/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml
index f80fcbc3128b..5b046932fbc3 100644
--- a/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml
+++ b/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml
@@ -64,6 +64,7 @@ properties:
 
   samsung,mode:
     $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1, 2, 3]
     description:
       Selects USI function (which serial protocol to use). Refer to
       <include/dt-bindings/soc/samsung,exynos-usi.h> for valid USI mode values.
-- 
2.43.0