serial: sh-sci: Add DMA support to the DT binding documentation

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
index ae73bb0..b91fcff 100644 (file)
--- a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
+++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
@@ -44,6 +44,11 @@ Required properties:
 Note: Each enabled SCIx UART should have an alias correctly numbered in the
 "aliases" node.
 
+Optional properties:
+  - dmas: Must contain a list of two references to DMA specifiers, one for
+         transmission, and one for reception.
+  - dma-names: Must contain a list of two DMA names, "tx" and "rx".
+
 Example:
        aliases {
                serial0 = &scifa0;
@@ -56,4 +61,6 @@ Example:
                interrupts = <0 144 IRQ_TYPE_LEVEL_HIGH>;
                clocks = <&mstp2_clks R8A7790_CLK_SCIFA0>;
                clock-names = "sci_ick";
+               dmas = <&dmac0 0x21>, <&dmac0 0x22>;
+               dma-names = "tx", "rx";
        };