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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/Documentation/devicetree/bindings/serial/rs485.txt
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-* RS485 serial communications
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-
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-The RTS signal is capable of automatically controlling line direction for
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-the built-in half-duplex mode.
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-The properties described hereafter shall be given to a half-duplex capable
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-UART node.
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-
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-Optional properties:
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-- rs485-rts-delay: prop-encoded-array <a b> where:
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-  * a is the delay between rts signal and beginning of data sent in milliseconds.
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-      it corresponds to the delay before sending data.
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-  * b is the delay between end of data sent and rts signal in milliseconds
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-      it corresponds to the delay after sending data and actual release of the line.
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-  If this property is not specified, <0 0> is assumed.
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-- rs485-rts-active-low: drive RTS low when sending (default is high).
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-- linux,rs485-enabled-at-boot-time: empty property telling to enable the rs485
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-  feature at boot time. It can be disabled later with proper ioctl.
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-- rs485-rx-during-tx: empty property that enables the receiving of data even
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-  whilst sending data.
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-
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-RS485 example for Atmel USART:
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-	usart0: serial@fff8c000 {
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-		compatible = "atmel,at91sam9260-usart";
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-		reg = <0xfff8c000 0x4000>;
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-		interrupts = <7>;
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-		atmel,use-dma-rx;
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-		atmel,use-dma-tx;
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-		linux,rs485-enabled-at-boot-time;
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-		rs485-rts-delay = <0 200>;		// in milliseconds
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-	};
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-
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+See rs485.yaml