On Mon, Jan 11, 2021 at 10:15 PM Mattias Wallin <mattias.wal...@se.com> wrote:
> >On Mon, Jan 11, 2021 at 12:10 PM Viresh Kumar <viresh.ku...@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 for
> patches in that area. We have patches that move some more parts over to
> devicetree (compared to mainline) but we haven't converted all. I will
> investigate 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
