[PATCH 1/2] irqchip: irq-meson-gpio: make it possible to build as a module

[Marc Zyngier]

On Tue, 03 Aug 2021 10:44:34 +0100,
Marc Zyngier <maz at 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 at 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 at ff600000/mdio-multiplexer at 4c000/mdio at 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 at tiger-roach:~# modprobe -r mdio_mux_meson_g12a
> root at tiger-roach:~# modprobe irq-meson-gpio 
> [  144.983344] meson-gpio-intc ffd0f080.interrupt-controller: 100 to 8 gpio interrupt mux initialized
> root at 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...

	M.

-- 
Without deviation from the norm, progress is not possible.