linux-kernel - Re: [PATCH v2] arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0

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Message-ID: <20220310104135.licbldjs2dvy2nm4@pali>
Date:   Thu, 10 Mar 2022 11:41:35 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Gregory CLEMENT <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Marek Behún <kabel@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: marvell: armada-37xx: Remap IO space to
 bus address 0x0

On Thursday 10 March 2022 11:22:38 Arnd Bergmann wrote:
> On Thu, Mar 10, 2022 at 11:09 AM Pali Rohár <pali@...nel.org> wrote:
> > On Thursday 10 March 2022 11:05:00 Gregory CLEMENT wrote:
> 
> > >
> > > This patch has been refused by Arnd so I removed it from the mvebu/fixes
> > > branch so you should not apply anything on top of it.
> >
> > Ok, so what is wrong with a change which increase size of IO space to 1 MB?
> 
> It should not cause any harm, but there is really no point in this if no known
> devices use more than a few bytes, and Linux only maps the first 64KB of
> the I/O space for each host bridge. I don't actually see where we limit the
> size to 64KB, so maybe that changed recently.
> 
>         Arnd

Ok. Anyway, I was told that DTS should describe HW properties and not to
be bound with SW implementation or SW limitations, like case here if
Linux SW limits some sizes.