Include the generic serial.yaml dtschema so the child node like
"bluetooh" will be properly matched:

  arch/arm/boot/dts/exynos4210-universal_c210.dt.yaml:
    serial@13800000: 'bluetooth' does not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 .../bindings/serial/samsung_uart.yaml         | 26 ++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.yaml b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
index 3e29b561223d..f4faf32ab00f 100644
--- a/Documentation/devicetree/bindings/serial/samsung_uart.yaml
+++ b/Documentation/devicetree/bindings/serial/samsung_uart.yaml

@@ -78,9 +78,11 @@ required:
   - interrupts
   - reg
 
-additionalProperties: false
+unevaluatedProperties: false
 
 allOf:
+  - $ref: /schemas/serial.yaml#
+
   - if:
       properties:
         compatible:

@@ -134,3 +136,25 @@ examples:
                  <&clocks SCLK_UART>;
         samsung,uart-fifosize = <16>;
     };
+
+  - |
+    #include <dt-bindings/clock/exynos4.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    serial@13800000 {
+        compatible = "samsung,exynos4210-uart";
+        reg = <0x13800000 0x100>;
+        interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clock CLK_UART0>, <&clock CLK_SCLK_UART0>;
+        clock-names = "uart", "clk_uart_baud0";
+        dmas = <&pdma0 15>, <&pdma0 16>;
+        dma-names = "rx", "tx";
+        pinctrl-0 = <&uart0_data &uart0_fctl>;
+        pinctrl-names = "default";
+
+        bluetooth {
+            compatible = "brcm,bcm4330-bt";