Commit c54d4854 authored by Christoph Niedermaier's avatar Christoph Niedermaier Committed by Greg Kroah-Hartman
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serial: stm32: Add support for rs485 RX_DURING_TX output GPIO 



If a RX_DURING_TX GPIO is defined by the DT property "rs485-rx-during-tx-gpios"
this patch switches this GPIO accordingly to the RS485 flag RX_DURING_TX in user
space. Controlled by this GPIO, now the hardware is responsible for connecting
or disconnecting RX during TX.

Signed-off-by: default avatarChristoph Niedermaier <cniedermaier@dh-electronics.com>
Link: https://lore.kernel.org/r/20221202104127.122761-4-cniedermaier@dh-electronics.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ca530cfa

drivers/tty/serial/stm32-usart.c

+5 −1
Original line number Diff line number Diff line
@@ -226,6 +226,10 @@ static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *ter 


	stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));



	if (port->rs485_rx_during_tx_gpio)

		gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio,

					 !!(rs485conf->flags & SER_RS485_RX_DURING_TX));

	else

		rs485conf->flags |= SER_RS485_RX_DURING_TX;



	if (rs485conf->flags & SER_RS485_ENABLED) {