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 18:02:48 +0300
From: "Konstantin P." <ria.freelander@...il.com>
To: Andy Shevchenko <andy@...nel.org>
Cc: Konstantin Pugin <rilian.la.te@...ru>, 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, 
	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 Fri, Apr 26, 2024 at 5:36 PM Andy Shevchenko <andy@...nel.org> wrote:
>
> 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.
>

Do I need to increase the version number in split send? And if I need
to do so, then how I should do it? Only on new driver? Or only on fix?
Should I CC linux-stable in fix patch?
> --
> With Best Regards,
> Andy Shevchenko
>
>