dt-bindings: serial: uartlite: Add properties for synthesis-time parameters

The uartlite device is a "soft" device. Many parameters, such as baud
rate, data bits, and the presence of a parity bit are configured before
synthesis and may not be changed (or discovered) at runtime. However, we
must know what these settings are in order to properly calculate the
uart timeout (and to inform the user about the actual baud of the uart).

These properties are present for out-of-tree bindings generated by
Xilinx's tools. However, they are also (mostly) present in in-tree
bindings. I chose current-speed over xlnx,baudrate primarily because it
seemed to be used by more existing bindings. Although these properties
are marked as "required", note that only current-speed is required by
the driver itself. Hopefully, this will allow for an easier transition.
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NSean Anderson <sean.anderson@seco.com>
Link: https://lore.kernel.org/r/20210826192154.3202269-3-sean.anderson@seco.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/xlnx,opb-uartlite.yaml

@@ -32,13 +32,47 @@ properties:
   clock-names:
     const: s_axi_aclk
 
+  current-speed:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      The fixed baud rate that the device was configured for.
+
+  xlnx,data-bits:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [5, 6, 7, 8]
+    description:
+      The fixed number of data bits that the device was configured for.
+
+  xlnx,use-parity:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+    description:
+      Whether parity checking was enabled when the device was configured.
+
+  xlnx,odd-parity:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+    description:
+      Whether odd parity was configured.
+
 required:
   - compatible
   - reg
   - interrupts
+  - current-speed
+  - xlnx,data-bits
+  - xlnx,use-parity
 
 allOf:
   - $ref: /schemas/serial.yaml#
+  - if:
+      properties:
+        xlnx,use-parity:
+          contains:
+            const: 1
+    then:
+      required:
+        - xlnx,odd-parity
 
 unevaluatedProperties: false
 
@@ -49,5 +83,8 @@ examples:
         reg = <0x800c0000 0x10000>;
         interrupts = <0x0 0x6e 0x1>;
         port-number = <0>;
+        current-speed = <115200>;
+        xlnx,data-bits = <8>;
+        xlnx,use-parity = <0>;
       };
 ...