linux-kernel - Re: [PATCH v1 5/5] arm64: dts: meson: a1: change uart compatible string

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Message-ID: <20230704171900.ulnnpkuzvtbbqa3d@CAB-WSD-L081021>
Date:   Tue, 4 Jul 2023 20:19:00 +0300
From:   Dmitry Rokosov <ddrokosov@...rdevices.ru>
To:     Conor Dooley <conor@...nel.org>
CC:     <gregkh@...uxfoundation.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <neil.armstrong@...aro.org>, <jbrunet@...libre.com>,
        <jirislaby@...nel.org>, <khilman@...libre.com>,
        <martin.blumenstingl@...glemail.com>, <kelvin.zhang@...ogic.com>,
        <xianwei.zhao@...ogic.com>, <kernel@...rdevices.ru>,
        <rockosov@...il.com>, <linux-amlogic@...ts.infradead.org>,
        <linux-serial@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 5/5] arm64: dts: meson: a1: change uart compatible
 string

On Tue, Jul 04, 2023 at 06:10:46PM +0100, Conor Dooley wrote:
> On Tue, Jul 04, 2023 at 08:08:43PM +0300, Dmitry Rokosov wrote:
> > On Tue, Jul 04, 2023 at 06:02:58PM +0100, Conor Dooley wrote:
> > > On Tue, Jul 04, 2023 at 04:59:36PM +0300, Dmitry Rokosov wrote:
> > > > In the current implementation, the meson-a1 configuration incorporates a
> > > > unique compatibility tag "amlogic,meson-a1-uart' within the meson-uart
> > > > driver due to its usage of the new console device name "ttyS".
> > > > Consequently, the previous compatibility tag designated for the
> > > > 'amlogic,meson-gx-uart' configuration has become obsolete and is no
> > > > longer relevant to the current setup.
> > > 
> > > I don't really see why you would remove the gx-uart to be honest, and
> > > not use it as a fallback. Neil's platform though, so his call :)
> > > 
> > 
> > Because of amlogic,meson-gx-uart has legacy devname, we do not want to
> > use it in the A1.
> 
> Which I did read in your commit message, fallback being the operative
> word here.

Although it is difficult for me to envision a situation where we would
require this fallback, but gx-uart fallback will function from a kernel
perspective (without taking into account bootloader setup or userspace
daemon script). I don't have any objections to stay gx-uart as a
fallback, will do it in the v2.

-- 
Thank you,
Dmitry