linux-kernel - Re: [PATCH 4/4] sh: machvec: remove custom ioport

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Date:   Thu, 14 Sep 2023 08:23:42 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Arnd Bergmann <arnd@...nel.org>, linux-sh@...r.kernel.org,
        Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] sh: machvec: remove custom ioport_{un,}map()

Hi Arnd!

On Wed, 2023-09-13 at 16:30 +0200, Arnd Bergmann wrote:
> > In the meantime, there is a v2, which I wasn't aware of when I wrote
> > my previous email, so perhaps my comment is no longer valid.
> > "[RFC PATCH v2 00/30] Device Tree support for SH7751 based board"
> > https://lore.kernel.org/linux-sh/cover.1694596125.git.ysato@users.sourceforge.jp
> 
> Right, it looks like the GENERIC_IOMAP part if gone from that
> series, and I also see that the PCI host bridge does not actually
> map the port I/O window. That's usually fine because very few
> drivers actually need it, and it also means that there should be
> no need for GENERIC_IOMAP or the simpler alternative.
> 
> The first version probably only did it accidentally, which is a
> common mistake, and I think the ones for hexagon, m68k, and
> mips can probably be removed as well with some simplifiations.
> 
> x86 and ia64 want GENERIC_IOMAP because they require using
> custom instructions for accessing IORESOURCE_IO registers,
> but it's not really generic.

Would you suggest to apply your series before or after Yoshinori's series to
convert arch/sh to device trees? If you want it to go in before the conversion,
could you rebase your series against v6.6-rc1?

I'm asking because the current version did not apply against v6.5-rc2.

Adrian

-- 
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