dt-bindings: serial: sprd: Add dma properties to support DMA mode
authorLanqing Liu <lanqing.liu@unisoc.com>
Mon, 4 Mar 2019 08:58:23 +0000 (16:58 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 27 Mar 2019 15:30:00 +0000 (00:30 +0900)
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>
Documentation/devicetree/bindings/serial/sprd-uart.txt

index 6eb5863..9607dc6 100644 (file)
@@ -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>;
        };