linux-kernel - Re: [PATCH v9 08/10] serial: sc16is7xx: add call to get rs485 DT flags and properties

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Message-ID: <2023080429-animate-elliptic-3167@gregkh>
Date:   Fri, 4 Aug 2023 15:14:43 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, jirislaby@...nel.org, jringle@...dpoint.com,
        isaac.true@...onical.com, jesse.sung@...onical.com,
        l.perczak@...lintechnologies.com, tomasz.mon@...lingroup.com,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Lech Perczak <lech.perczak@...lingroup.com>
Subject: Re: [PATCH v9 08/10] serial: sc16is7xx: add call to get rs485 DT
 flags and properties

On Thu, Aug 03, 2023 at 10:38:14AM -0400, Hugo Villeneuve wrote:
> On Mon, 31 Jul 2023 17:59:14 +0200
> Greg KH <gregkh@...uxfoundation.org> wrote:
> 
> > On Tue, Jul 25, 2023 at 10:23:40AM -0400, Hugo Villeneuve wrote:
> > > From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > > 
> > > Add call to uart_get_rs485_mode() to probe for RS485 flags and
> > > properties from device tree.
> > 
> > Again, you are saying what you are doing, but not why.  I have no hint
> > as to if this is a bugfix, or a new features, or something else?
> > 
> > thanks,
> > 
> > greg k-h
> 
> Hi Greg,
> I could change the commit message to:
> 
> ---------
> serial: sc16is7xx: add missing support for rs485 devicetree properties
> 
> Retrieve rs485 devicetree properties on registration of sc16is7xx ports
> in case they are attached to an rs485 transceiver.
> ---------
> 
> I don't think that it should be considered as a bug fix, but maybe as a
> missing feature.
> 
> And does it mean that it should also go to older (stable) kernels then?
> If yes, then do I need to add the "Fixes" tag?

Does it fix a problem?  If so, yes, it should go to older kernels.  If
not, then no.

thanks,

greg k-h