linux-kernel - Re: [PATCH v1] sh: boards: fix CEU buffer size passed to dma_declare_coherent

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Message-ID: <1835ec88216c9be58f9bce518575f6348158b231.camel@physik.fu-berlin.de>
Date:   Tue, 25 Jul 2023 13:38:25 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Petr Tesarik <petrtesarik@...weicloud.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "open list:SUPERH" <linux-sh@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...weicloud.com>,
        petr@...arici.cz, Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v1] sh: boards: fix CEU buffer size passed to
 dma_declare_coherent_memory()

On Tue, 2023-07-25 at 14:09 +0300, Laurent Pinchart wrote:
> On Tue, Jul 25, 2023 at 07:50:56AM +0200, John Paul Adrian Glaubitz wrote:
> > On Mon, 2023-07-24 at 20:43 +0300, Laurent Pinchart wrote:
> > > > arch/sh is being maintained again, so it's save to keep these boards. At some point, we're
> > > > going to convert the architecture to using Device Trees which should reduce the maintenance
> > > > burden anyways.
> > > 
> > > Keeping the architecture is fine for newer systems, but is anyone really
> > > maintaining the Renesas SH board ?
> > 
> > I own Renesas evaluation boards, including SH7785LCR-based and
> > SH7724-based boards.
> 
> Will you have time to port them to DT, or would you rather focus on
> J-core systems ? Do those boards still boot a mainline kernel ?
> 
> Dropping Renesas SH board files doesn't preclude anyone from moving them
> to DT, all the information will remain in the git history. Unless you
> plan to move to DT in a reasonably near future, I think dropping support
> for the CEU at least, if not the whole board files, could be a good
> option.

I'm not sure why you are trying to convince me to kill off support for SuperH
boards. I have just stepped up maintenance of arch/sh to keep SuperH hardware
supported in the kernel because I have been a maintainer of Debian's SuperH
port for several years now.

There is also a small community of SuperH enthusiasts now hacking on the kernel
which is coming together for discussion in #linux-sh on libera IRC.

Thanks,
Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913