linux-kernel - Re: [PATCH] ARM: debug: enable UART1 for socfpga Cyclone5

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Date:   Wed, 24 Oct 2018 16:11:59 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     u.kleine-koenig@...gutronix.de
Cc:     Dinh Nguyen <dinguyen@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: debug: enable UART1 for socfpga Cyclone5

Hi,

On Wed, 24 Oct 2018 at 08:51, Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> wrote:
>
> On Tue, Oct 23, 2018 at 03:35:31PM -0500, Dinh Nguyen wrote:
> >
> >
> > On 10/23/2018 09:44 AM, Clément Péron wrote:
> > > HI Dinh,
> > >
> > > On Tue, 23 Oct 2018 at 16:04, Dinh Nguyen <dinguyen@...nel.org> wrote:
> > >>
> > >> Hi Clément,
> > >>
> > >> On 10/09/2018 06:28 AM, Clément Péron wrote:
> > >>> Cyclone5 and Arria10 doesn't have the same memory map for UART1.
> > >>>
> > >>> Split the SOCFPGA_UART1 into 2 options to allow debugging on UART1 for Cylone5.
> > >>>
> > >>
> > >> I'm not sure the need for this patch. Are there any cyclone5 based
> > >> boards that has UART1 as the debug uart? I see that all of them are
> > >> using UART0.
> > >
> > > There is no upstream device with this UART used. But the board I have
> > > use it, and there is no limitation to not have it available upstream
> > > no ?
> > >
> >
> > I see. Then I don't think the patch is applicable because none of the
> > upstream devices need it. Now, if you were to upstream your board that
> > uses UART1, then there will be a case for this patch. Do you agree?

I don't think my board is upstreamable it's not a devkit and not
really interesting for the community.

It's really a trivial patch and it will avoid wasting time  to another
owner of CycloneV board who would like to have debug on UART1

Thanks
Clement

>
> I'd not say having to upstream the board is a sensible precondition for
> such a patch. One of the arguments for moving ARM to dt was that this
> allows to separate the machine specifics from the code. So I'd say if
> Clément has a need, this is a good enough reason to take this patch.
>
> Just my 0.02 €,
> Uwe
>
> --
> Pengutronix e.K.                           | Uwe Kleine-König            |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |