[PATCH 1/2] dt-bindings: serial: imx: Document optional DMA properties

[Marek Vasut <marex@xxxxxxx>]

The UART IP can be connected to DMA engine, document the properties in DT bindings.
Update example to match Linux arch/arm/boot/dts/imx51.dtsi .

Signed-off-by: Marek Vasut <marex@xxxxxxx>
---
Cc: Fabio Estevam <festevam@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx>
Cc: NXP Linux Team <linux-imx@xxxxxxx>
Cc: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-serial@xxxxxxxxxxxxxxx
---
 .../devicetree/bindings/serial/fsl-imx-uart.yaml     | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml b/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml
index 4cbe76e1715b7..c22aab8c55f83 100644
--- a/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml
@@ -49,6 +49,16 @@ properties:
   reg:
     maxItems: 1
 
+  dmas:
+    items:
+      - description: DMA controller phandle and request line for RX
+      - description: DMA controller phandle and request line for TX
+
+  dma-names:
+    items:
+      - const: rx
+      - const: tx
+
   interrupts:
     maxItems: 1
 
@@ -100,6 +110,8 @@ examples:
         compatible = "fsl,imx51-uart", "fsl,imx21-uart";
         reg = <0x73fbc000 0x4000>;
         interrupts = <31>;
+        dmas = <&sdma 18 4 1>, <&sdma 19 4 2>;
+        dma-names = "rx", "tx";
         uart-has-rtscts;
         fsl,dte-mode;
     };
-- 
2.39.1