linux-kernel - Re: [PATCH v3 5/5] serial: 8250

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Date:   Mon, 18 May 2020 18:21:03 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     gregkh@...uxfoundation.org, jslaby@...e.com,
        matwey.kornilov@...il.com, giulio.benetti@...ronovasrl.com,
        lukas@...ner.de, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        christoph.muellner@...obroma-systems.com,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>
Subject: Re: [PATCH v3 5/5] serial: 8250_dw: add em485 support

On Sun, May 17, 2020 at 11:56:10PM +0200, Heiko Stuebner wrote:
> From: Giulio Benetti <giulio.benetti@...ronovasrl.com>
> 
> Need to use rs485 transceiver so let's use existing em485 485 emulation
> layer on top of 8250.
> 
> Add rs485_config callback to port and uses the standard em485 start and
> stop helpers.

Would it prevent to use native RS485 support?

...

>  	p->serial_out	= dw8250_serial_out;
>  	p->set_ldisc	= dw8250_set_ldisc;
>  	p->set_termios	= dw8250_set_termios;
> +	p->rs485_config = serial8250_em485_config;
> +	up->rs485_start_tx = serial8250_em485_start_tx;
> +	up->rs485_stop_tx = serial8250_em485_stop_tx;

-- 
With Best Regards,
Andy Shevchenko