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8    EIA-485, also known as TIA/EIA-485 or RS-485, is a standard defining the
15 2. Hardware-related Considerations
18    Some CPUs/UARTs (e.g., Atmel AT91 or 16C950 UART) contain a built-in
19    half-duplex mode capable of automatically controlling line direction by
21    half-duplex hardware like an RS485 transceiver or any RS232-connected
22    half-duplex devices like some modems.
24    For these microcontrollers, the Linux driver should be made capable of
26    available at user-level to allow switching from one mode to the other, and
37    [#DT-bindings]_. The serial core fills the struct serial_rs485 from the
41    Any driver for devices capable of working both as RS232 and RS485 should
52 .. kernel-doc:: include/uapi/linux/serial.h
55 4. Usage from user-level
58    From user-level, RS485 configuration can be get/set using the previous
74 	/* Enable RS485 mode: */
110    The Linux kernel provides addressing mode for multipoint RS-485 serial
111    communications line. The addressing mode is enabled with
116    Address mode flags:
117 	- ``SER_RS485_ADDRB``: Enabled addressing mode (sets also ADDRB in termios).
118 	- ``SER_RS485_ADDR_RECV``: Receive (filter) address enabled.
119 	- ``SER_RS485_ADDR_DEST``: Set destination address.
122 	- ``addr_recv``: Receive address.
123 	- ``addr_dest``: Destination address.
135 .. [#DT-bindings]	Documentation/devicetree/bindings/serial/rs485.txt