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Date:   Sat, 16 May 2020 22:14:56 +0200
From:   Lukas Wunner <lukas@wunner.de>
To:     Heiko Stuebner <heiko@sntech.de>
Cc:     gregkh@linuxfoundation.org, jslaby@suse.com,
        andriy.shevchenko@linux.intel.com, matwey.kornilov@gmail.com,
        linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
        christoph.muellner@theobroma-systems.com,
        giulio.benetti@micronovasrl.com,
        Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Subject: Re: [PATCH v2 6/7] serial: 8250: Support separate rs485 rx-enable
 GPIO
Message-ID: <20200516201456.pieoebueqkq7q7ov@wunner.de>
References: <20200325231422.1502366-1-heiko@sntech.de>
 <20200325231422.1502366-7-heiko@sntech.de>
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On Thu, Mar 26, 2020 at 12:14:21AM +0100, Heiko Stuebner wrote:
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -3356,6 +3356,18 @@ int uart_get_rs485_mode(struct uart_port *port)
>  			rs485conf->flags |= SER_RS485_TERMINATE_BUS;
>  	}
>  
> +	port->rs485_re_gpio = devm_gpiod_get(dev, "rs485-rx-enable",
> +					       GPIOD_FLAGS_BIT_DIR_OUT);

I think you want to use GPIOD_OUT_HIGH here so that rs485 reception
is enabled by default and only disabled at runtime when sending
(if half-duplex mode is used).

Thanks,

Lukas