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-rw-r--r--dts/Bindings/serial/fsl-imx-uart.txt6
1 files changed, 5 insertions, 1 deletions
diff --git a/dts/Bindings/serial/fsl-imx-uart.txt b/dts/Bindings/serial/fsl-imx-uart.txt
index afcfbc3..35957cb 100644
--- a/dts/Bindings/serial/fsl-imx-uart.txt
+++ b/dts/Bindings/serial/fsl-imx-uart.txt
@@ -9,7 +9,11 @@ Optional properties:
- fsl,dte-mode : Indicate the uart works in DTE mode. The uart works
in DCE mode by default.
- rs485-rts-delay, rs485-rts-active-low, rs485-rx-during-tx,
- linux,rs485-enabled-at-boot-time: see rs485.txt
+ linux,rs485-enabled-at-boot-time: see rs485.txt. Note that for RS485
+ you must enable either the "uart-has-rtscts" or the "rts-gpios"
+ properties. In case you use "uart-has-rtscts" the signal that controls
+ the transceiver is actually CTS_B, not RTS_B. CTS_B is always output,
+ and RTS_B is input, regardless of dte-mode.
Please check Documentation/devicetree/bindings/serial/serial.txt
for the complete list of generic properties.