linux-kernel - Re: [PATCH v1 18/31] serial: 8250: allow low-level driver to override break

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Message-ID: <CAHp75VdLXH1h_pmCsdn40+r6sBAYmLmHx2zm1E_-oQnF6tOheA@mail.gmail.com>
Date: Mon, 1 Dec 2025 03:54:55 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Crescent Hsieh <crescentcy.hsieh@...a.com>
Cc: gregkh@...uxfoundation.org, jirislaby@...nel.org, 
	ilpo.jarvinen@...ux.intel.com, linux-kernel@...r.kernel.org, 
	linux-serial@...r.kernel.org
Subject: Re: [PATCH v1 18/31] serial: 8250: allow low-level driver to override break_ctl()

On Sun, Nov 30, 2025 at 12:45 PM Crescent Hsieh
<crescentcy.hsieh@...a.com> wrote:
>
> Moxa PCIe serial boards requires custom break signal transmission under
> RS485 mdoe. However, the current 8250 driver does not provide a way for

mode

> low-level driver to override this behavior.
>
> This patch introduces a break_ctl() function pointer in struct
> uart_port, allowing low-level drivers to customize the break signal
> transmission logic. If no custom implementation is provided, the default
> serial8250_do_break_ctl() function is used. This ensures that
> hardware-specific break signaling can be implemented without affecting
> standard behavior.

...

> +EXPORT_SYMBOL_GPL(serial8250_do_break_ctl);

There is another (scoped) export used in this driver, use it for this
function as well.

-- 
With Best Regards,
Andy Shevchenko