linux-kernel - Re: [PATCH] dmaengine: ARM_DMA350 should depend on ARM/ARM64

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Message-ID: <CAMuHMdXQKG0qptWMi169MVBL1S3hPo1TsaOSxWspoHAwRd+fug@mail.gmail.com>
Date: Wed, 23 Apr 2025 14:13:00 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Vinod Koul <vkoul@...nel.org>
Cc: Robin Murphy <robin.murphy@....com>, dmaengine@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: ARM_DMA350 should depend on ARM/ARM64

Hi Vinod,

On Wed, 23 Apr 2025 at 13:48, Vinod Koul <vkoul@...nel.org> wrote:
> On 23-04-25, 13:11, Geert Uytterhoeven wrote:
> > On Wed, 23 Apr 2025 at 12:59, Robin Murphy <robin.murphy@....com> wrote:
> > > On 2025-04-22 7:11 pm, Geert Uytterhoeven wrote:
> > > > The Arm DMA-350 controller is only present on Arm-based SoCs.
> > >
> > > Do you know that for sure? I certainly don't. This is a licensable,
> > > self-contained DMA controller IP with no relationship whatsoever to any
> > > particular CPU ISA - our other system IP products have turned up in the
> > > wild paired with non-Arm CPUs, so I don't see any reason that DMA-350
> > > wouldn't either.
> >
> > The dependency can always be relaxed later, when the need arises.
> > Note that currently there are no users at all...
>
> True, but do we have any warnings generated as a result, if there are no
> dependency should we still limit a driver to an arch?

I am not aware of any warnings (I built it on MIPS yesterday ;-).
It is just one more question that pops up during "make oldconfig",
and Linus may notice and complain, too...

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds