[PATCH v4 09/19] dt-bindings: serial: samsung: Make samsung,uart-fifosize required property

[Peter Griffin]

Specifying samsung,uart-fifosize in both DT and driver static data is error
prone and relies on driver probe order and dt aliases to be correct.

Additionally on many Exynos platforms these are (USI) universal serial
interfaces which can be uart, spi or i2c, so it can change per board.

For google,gs101-uart and exynosautov9-uart make samsung,uart-fifosize a
required property. For these platforms fifosize now *only* comes from DT.

It is hoped other Exynos platforms will also switch over time.

Signed-off-by: Peter Griffin <peter.griffin at linaro.org>
---
 .../bindings/serial/samsung_uart.yaml           | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.yaml b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
index ccc3626779d9..22a1edadc4fe 100644
--- a/Documentation/devicetree/bindings/serial/samsung_uart.yaml
+++ b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
@@ -133,6 +133,23 @@ allOf:
             - const: uart
             - const: clk_uart_baud0
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - google,gs101-uart
+              - samsung,exynosautov9-uart
+    then:
+      properties:
+        samsung,uart-fifosize:
+          description: The fifo size supported by the UART channel.
+          $ref: /schemas/types.yaml#/definitions/uint32
+          enum: [16, 64, 256]
+
+      required:
+       - samsung,uart-fifosize
+
 unevaluatedProperties: false
 
 examples:
-- 
2.43.0.rc1.413.gea7ed67945-goog