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From:   Arnd Bergmann <arnd@kernel.org>
Date:   Mon, 11 Jan 2021 22:47:22 +0100
Message-ID: <CAK8P3a0+M2UHe+DqqmTSrAs94rZ1Uw6g1ibttU6PVivCi2RCkg@mail.gmail.com>
Subject: Re: Old platforms: bring out your dead
To:     Mattias Wallin <mattias.wallin@se.com>
Cc:     Viresh Kumar <viresh.kumar@linaro.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Krzysztof Adamski <krzysztof.adamski@nokia.com>,
        Oleksij Rempel <o.rempel@pengutronix.de>,
        Baruch Siach <baruch@tkos.co.il>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Daniel Tang <dt.tangr@gmail.com>,
        =?UTF-8?Q?Uwe_Kleine=2DK=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>, Jamie Iles <jamie@jamieiles.com>,
        Barry Song <song.bao.hua@hisilicon.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Jonas Jensen <jonas.jensen@gmail.com>,
        Marc Gonzalez <marc.w.gonzalez@free.fr>,
        Hartley Sweeten <hsweeten@visionengravers.com>,
        Lubomir Rintel <lkundrak@v3.sk>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Shawn Guo <shawnguo@kernel.org>, Alex Elder <elder@linaro.org>,
        Alexander Shiyan <shc_work@mail.ru>,
        Koen Vandeputte <koen.vandeputte@ncentric.com>,
        Hans Ulli Kroll <ulli.kroll@googlemail.com>,
        Vladimir Zapolskiy <vz@mleia.com>,
        Wei Xu <xuwei5@hisilicon.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Mark Salter <msalter@redhat.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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On Mon, Jan 11, 2021 at 10:15 PM Mattias Wallin <mattias.wallin@se.com> wro=
te:
> >On Mon, Jan 11, 2021 at 12:10 PM Viresh Kumar <viresh.kumar@linaro.org> =
wrote:
> >> On 08-01-21, 23:55, Arnd Bergmann wrote:
> >> > * spear -- added in 2010, no notable changes since 2015
> >>
> >> I started an email chain with the ST folks to see if there are any
> >> concerns with this getting removed and it was confirmed by Mattias
> >> (Cc'd) from Schneider Electric (one of SPEAr's customers) that they
> >> indeed use mainline on spear320s and the spear1380 boards, while they
> >> also have access to spear1310 board which they don't use that often.
>
> > Thank you for reaching out to them!
>
> > Do we actually support spear1380 with the mainline kernel? I've
> > never seen anything other than 1310 and 1340 models mentioned.
> > If Schneider have additional patches on top of mainline for this,
> > it would be good to get those merged as well. Is there a kernel
> > source tree available somewhere?
>
> > Rob Herring had mentioned that it would be nice to see SPEAr
> > get removed eventually because it was only partially converted
> > to devicetree, with some AUXDATA() (on 300/310/320/6xx) and
> > some dmaengine channel data still in source format. These need
> > to be finished before we can kill off AUXDATA.
>
> Thanks for taking the time Arnd and Viresh
>
> The spear1380 is not supported in mainline but it's quite similar to 1310=
 and 1340.
> The spear13xx comes in a few flavors. 1310 and 1340 are the standard ones=
 sold by ST and the 1380 are the customized version for Schneider Electric =
needs. One part of the chip is customizable but the base is the same in all=
 13xx. So a few IP blocks differ between the flavors. I can try to send you=
 the 1380 stuff as well.
>
> There is currently no external source tree for our kernel easy available.
>
> If the AUXDATA on 3xx is a problem I can try to start focus on sending fo=
r patches in that area. We have patches that move some more parts over to d=
evicetree (compared to mainline) but we haven't converted all. I will inves=
tigate if we have something that helps in that area.

This sounds great, thanks! I think the main work that needs to
be done here is to convert the DT over to use the regular
dma-controller binding (as used on spear13xx) for the pl080.
Please contact Vinod Koul, Linus Walleij and me in a separate
email thread if you have questions about that.

Looking forward to getting those patches,

      Arnd