On Mon, Nov 20, 2023 at 10:45:20PM +0100, Tomas Paukrt wrote:
> Add an option to enable the RS485 mode at boot time based on
> the state of a GPIO pin (DIP switch or configuration jumper).
> The GPIO is defined by the device tree property "rs485-mode-gpio".
>
> Signed-off-by: Tomas Paukrt <tomaspaukrt@xxxxxxxx>
> ---
> drivers/tty/serial/serial_core.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index f1348a5..f1bf0b9 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -3603,6 +3603,18 @@ int uart_get_rs485_mode(struct uart_port *port)
> }
>
> /*
> + * Enable the RS485 mode based on the state of a GPIO pin.
> + */
> + desc = devm_gpiod_get_optional(dev, "rs485-mode", GPIOD_IN);
> + if (IS_ERR(desc))
> + return dev_err_probe(dev, PTR_ERR(desc), "Cannot get rs485-mode-gpio\n");
> + if (desc) {
> + if (gpiod_get_value(desc))
> + rs485conf->flags |= SER_RS485_ENABLED;
> + devm_gpiod_put(dev, desc);
> + }
> +
> + /*
> * Disabling termination by default is the safe choice: Else if many
> * bus participants enable it, no communication is possible at all.
> * Works fine for short cables and users may enable for longer cables.
> --
> 2.7.4
>
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
to these common problems, but in order to save his sanity (he kept
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created. Hopefully you will not take offence and will fix the problem
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Please read the section entitled "The canonical patch format" in the
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