linux-kernel - Re: [PATCH] of: property: Add device link support for interrupts

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Message-ID: <CAMuHMdWEOpbh8xS9W09xudpoym8=J4UzuWTDqF3L+yDuU3k2ZQ@mail.gmail.com>
Date:   Wed, 20 Jan 2021 15:28:16 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Marc Zyngier <maz@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Android Kernel Team <kernel-team@...roid.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of: property: Add device link support for interrupts

Hi Saravana,

On Wed, Jan 20, 2021 at 10:53 AM Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> On Fri, Dec 18, 2020 at 10:11 PM Saravana Kannan <saravanak@...gle.com> wrote:
> > Add support for creating device links out of interrupts property.
> >
> > Cc: Marc Zyngier <maz@...nel.org>
> > Cc: Kevin Hilman <khilman@...libre.com>
> > Signed-off-by: Saravana Kannan <saravanak@...gle.com>
>
> Thanks for your patch!
>
> This does not seem to add all links.  I see links being created to the
> secondary interrupt controller (e61c0000 "renesas,irqc"), but not to
> the primary interrupt controller (GIC)
>
> Which is good, as the GIC driver is not a platform_driver, and thus
> creating links would break everything ;-)

of_link_to_phandle() ignores device nodes where OF_POPULATED
is set, and of_irq_init() sets that flag.  Hence the GIC is ignored.

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