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| author | Christoph Niedermaier <cniedermaier@dh-electronics.com> | 2022-12-02 11:41:27 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-19 16:01:35 +0100 |
| commit | c54d48543689f821f6a5ade7e7fa828ada6a1195 (patch) | |
| tree | d671164398593837808e884a84fec669eceb12cd /drivers/tty/serial | |
| parent | ca530cfa968c6fa197ee7df877a277954b87bad5 (diff) | |
| download | linux-stable-c54d48543689f821f6a5ade7e7fa828ada6a1195.tar.gz linux-stable-c54d48543689f821f6a5ade7e7fa828ada6a1195.tar.bz2 linux-stable-c54d48543689f821f6a5ade7e7fa828ada6a1195.zip | |
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: 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>
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/stm32-usart.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index a1490033aa16..f1b1df78118f 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -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); |