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-rw-r--r--Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt10
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
index 59a40f18d551..7c408c87e613 100644
--- a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
+++ b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
@@ -11,8 +11,13 @@ Required properties:
- dma-names: "rx" for RX channel, "tx" for TX channel.
Optional properties:
-- fsl,uart-has-rtscts : Indicate the UART has RTS and CTS lines,
+- fsl,uart-has-rtscts : Indicate the UART has RTS and CTS lines
+ for hardware flow control,
it also means you enable the DMA support for this UART.
+- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD
+ line respectively. It will use specified PIO instead of the peripheral
+ function pin for the USART feature.
+ If unsure, don't specify this property.
Example:
auart0: serial@8006a000 {
@@ -21,6 +26,9 @@ auart0: serial@8006a000 {
interrupts = <112>;
dmas = <&dma_apbx 8>, <&dma_apbx 9>;
dma-names = "rx", "tx";
+ cts-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
+ dsr-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
+ dcd-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>;
};
Note: Each auart port should have an alias correctly numbered in "aliases"