linux-kernel - Re: [PATCH v9 1/3] serial: sc16is7xx: announce support of SER_RS485_RTS_ON

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Date: Fri, 26 Apr 2024 17:32:46 +0300
From: Andy Shevchenko <andy@...nel.org>
To: Konstantin Pugin <rilian.la.te@...ru>
Cc: krzk@...nel.org, conor@...nel.org, lkp@...el.com, vz@...ia.com,
	robh@...nel.org, jcmvbkbc@...il.com, nicolas.ferre@...rochip.com,
	manikanta.guntupalli@....com, corbet@....net, ychuang3@...oton.com,
	u.kleine-koenig@...gutronix.de, Maarten.Brock@...ls.nl,
	Konstantin Pugin <ria.freelander@...il.com>,
	Hugo Villeneuve <hvilleneuve@...onoff.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Lech Perczak <lech.perczak@...lingroup.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v9 1/3] serial: sc16is7xx: announce support of
 SER_RS485_RTS_ON_SEND

On Thu, Apr 25, 2024 at 09:32:33PM +0300, Konstantin Pugin wrote:
> From: Konstantin Pugin <ria.freelander@...il.com>
> 
> When specifying flag SER_RS485_RTS_ON_SEND in RS485 configuration,
> we get the following warning after commit 4afeced55baa ("serial: core:
> fix sanitizing check for RTS settings"):
> 
>     invalid RTS setting, using RTS_AFTER_SEND instead
> 
> This results in SER_RS485_RTS_AFTER_SEND being set and the
> driver always write to the register field SC16IS7XX_EFCR_RTS_INVERT_BIT,
> which breaks some hardware using these chips.
> 
> The hardware supports both RTS_ON_SEND and RTS_AFTER_SEND modes, so fix
> this by announcing support for RTS_ON_SEND.

Greg KH, who is maintainer of TTY/serial subsystem, usually asks to separate
fixes from new features. So, sending this patch separately may not only help
him, but let's move forward with your stuff.

-- 
With Best Regards,
Andy Shevchenko