dt-bindings: serial: sprd: Add dma properties to support DMA mode

This patch adds dmas and dma-names properties for the UART DMA mode.

Signed-off-by: Lanqing Liu <lanqing.liu@unisoc.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/serial/sprd-uart.txt b/Documentation/devicetree/bindings/serial/sprd-uart.txt
index 6eb5863aa548a4f06b52aa6126feb0c5191754fe..9607dc616205ea55c43d3357aa9b6ded9cdc1979 100644 (file)
--- a/Documentation/devicetree/bindings/serial/sprd-uart.txt
+++ b/Documentation/devicetree/bindings/serial/sprd-uart.txt
@@ -15,12 +15,18 @@ Required properties:
   UART clock and source clock are optional properties, but enable clock
   is required.
 
+Optional properties:
+- dma-names: Should contain "rx" for receive and "tx" for transmit channels.
+- dmas: A list of dma specifiers, one for each entry in dma-names.
+
 Example:
        uart0: serial@0 {
                compatible = "sprd,sc9860-uart",
                             "sprd,sc9836-uart";
                reg = <0x0 0x100>;
                interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
+               dma-names = "rx", "tx";
+               dmas = <&ap_dma 19>, <&ap_dma 20>;
                clock-names = "enable", "uart", "source";
                clocks = <&clk_ap_apb_gates 9>, <&clk_uart0>, <&ext_26m>;
        };