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Subject[PATCH 4/5] dt-bindings: serial: sprd: Add dma properties to support DMA mode
Date
From: Lanqing Liu <lanqing.liu@unisoc.com>

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>
---
.../devicetree/bindings/serial/sprd-uart.txt | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/sprd-uart.txt b/Documentation/devicetree/bindings/serial/sprd-uart.txt
index 6eb5863..9ac28f6 100644
--- 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 "tx" for transmit and "rx" for receive 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 19>, <&ap_dma 20 20>;
clock-names = "enable", "uart", "source";
clocks = <&clk_ap_apb_gates 9>, <&clk_uart0>, <&ext_26m>;
};
--
1.7.9.5
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