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serial: stm32: Add support for rs485 RX_DURING_TX output GPIO

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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: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Link: https://lore.kernel.org/r/20221202104127.122761-4-cniedermaier@dh-electronics.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Niedermaier 2022-12-02 11:41:27 +01:00 committed by Greg Kroah-Hartman
parent ca530cfa96
commit c54d485436
1 changed files with 5 additions and 1 deletions
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6
drivers/tty/serial/stm32-usart.c
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@ -226,7 +226,11 @@ 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));
rs485conf->flags |= SER_RS485_RX_DURING_TX;
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) {
cr1 = readl_relaxed(port->membase + ofs->cr1);