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From: Saravana Kannan <saravanak@google.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Kevin Hilman <khilman@baylibre.com>,
	Lee Jones <lee.jones@linaro.org>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	linux-amlogic@lists.infradead.org,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] irqchip: irq-meson-gpio: make it possible to build as a module
Date: Tue, 3 Aug 2021 19:11:58 -0700	[thread overview]
Message-ID: <CAGETcx-XEJ25SvUO92wVyqjna+=CU6UTSQKqDimy008z0afA1g@mail.gmail.com> (raw)
In-Reply-To: <87h7g626wg.wl-maz@kernel.org>

On Tue, Aug 3, 2021 at 2:51 AM Marc Zyngier <maz@kernel.org> wrote:
>
> On Tue, 03 Aug 2021 10:44:34 +0100,
> Marc Zyngier <maz@kernel.org> wrote:
>
> [...]
>
> > This thing keeps failing on my end. It only works if I force the
> > irqchip module to be present before the MDIO module is loaded. Here's
> > an example:
> >
> > root@tiger-roach:~# modprobe mdio_mux_meson_g12a
> > [  125.871544] libphy: mdio_mux: probed
> > [  125.882575] g12a-mdio_mux ff64c000.mdio-multiplexer: Error: Failed to register MDIO bus for child /soc/bus@ff600000/mdio-multiplexer@4c000/mdio@0
> > [  125.892630] libphy: mdio_mux: probed
> >
> > Trying to bring up the Ethernet interface will fail. Note that there
> > was no attempt to load the irqchip driver.
> >
> > root@tiger-roach:~# modprobe -r mdio_mux_meson_g12a
> > root@tiger-roach:~# modprobe irq-meson-gpio
> > [  144.983344] meson-gpio-intc ffd0f080.interrupt-controller: 100 to 8 gpio interrupt mux initialized
> > root@tiger-roach:~# modprobe mdio_mux_meson_g12a
> > [  150.376464] libphy: mdio_mux: probed
> > [  150.391039] libphy: mdio_mux: probed
> >
> > And it now works.
>
> An additional source of amusement is that this patch allows the
> irqchip to be removed from the kernel. It becomes really fun when you
> have live interrupts...

Which is why I wrote IRQCHIP_PLATFORM_DRIVER_BEGIN/END macros. Maybe
those should be used instead?

-Saravana

[1] - https://lore.kernel.org/lkml/20200718000637.3632841-2-saravanak@google.com/

  reply	other threads:[~2021-08-04  2:12 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-20  7:25 [PATCH 0/2] " Neil Armstrong
2020-10-20  7:25 ` [PATCH 1/2] irqchip: " Neil Armstrong
2020-10-20 18:23   ` Kevin Hilman
     [not found]     ` <CAF2Aj3g6c8FEZb3e1by6sd8LpKLaeN5hsKrrQkZUvh8hosiW9A@mail.gmail.com>
2021-05-24 10:11       ` Marc Zyngier
2021-05-25 16:17         ` Kevin Hilman
2021-05-25 16:30           ` Lee Jones
2021-06-14 22:30         ` Kevin Hilman
2021-07-13  9:05           ` Lee Jones
2021-08-03  9:44           ` Marc Zyngier
2021-08-03  9:51             ` Marc Zyngier
2021-08-04  2:11               ` Saravana Kannan [this message]
2021-08-03  9:51             ` Neil Armstrong
2021-08-04  1:36             ` Saravana Kannan
2021-08-04  8:50               ` Marc Zyngier
2021-08-04 18:20                 ` Saravana Kannan
2021-08-04 21:47                   ` Saravana Kannan
2021-08-05  6:31                     ` Neil Armstrong
2021-08-06 23:55                       ` Saravana Kannan
2021-08-05  7:57                     ` Lee Jones
2021-08-16 12:47                       ` Lee Jones
2021-08-16 20:27                         ` Saravana Kannan
2021-08-16 20:46                           ` Andrew Lunn
2021-08-16 21:02                             ` Saravana Kannan
2021-08-16 21:18                               ` Andrew Lunn
2021-08-17  7:24                           ` Lee Jones
2021-08-17 18:12                             ` Saravana Kannan
2021-08-18 11:19                               ` Marc Zyngier
2021-09-02  9:28                                 ` Neil Armstrong
2020-10-20  7:25 ` [PATCH 2/2] arm64: meson: remove MESON_IRQ_GPIO selection Neil Armstrong
2020-10-20 23:18   ` Kevin Hilman
2020-10-25 11:51 ` [PATCH 0/2] irq-meson-gpio: make it possible to build as a module Marc Zyngier
2020-10-26 16:18   ` Kevin Hilman
2020-10-26 17:00     ` Marc Zyngier
2020-10-26 17:28       ` Kevin Hilman
2020-10-26 17:33         ` Kevin Hilman
2020-10-26 18:30         ` Marc Zyngier
2020-10-26 23:45       ` Kevin Hilman
2021-09-02 13:49 Neil Armstrong
2021-09-02 13:49 ` [PATCH 1/2] irqchip: " Neil Armstrong
2021-09-02 17:00   ` Saravana Kannan
2021-09-28 10:45     ` Lee Jones
2021-09-28 23:27   ` Kevin Hilman

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