Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/serial/fsl-imx-uart.txt b/Documentation/devicetree/bindings/serial/fsl-imx-uart.txt
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+++ b/Documentation/devicetree/bindings/serial/fsl-imx-uart.txt
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+* Freescale i.MX Universal Asynchronous Receiver/Transmitter (UART)
+
+Required properties:
+- compatible : Should be "fsl,<soc>-uart"
+- reg : Address and length of the register set for the device
+- interrupts : Should contain uart interrupt
+
+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. 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.
+
+Note: Each uart controller should have an alias correctly numbered
+in "aliases" node.
+
+Example:
+
+aliases {
+	serial0 = &uart1;
+};
+
+uart1: serial@73fbc000 {
+	compatible = "fsl,imx51-uart", "fsl,imx21-uart";
+	reg = <0x73fbc000 0x4000>;
+	interrupts = <31>;
+	uart-has-rtscts;
+	fsl,dte-mode;
+};