Hi,

this RFC tried to address the problem that sometimes at time of probing the
parent IRQ domain is not yet ready. This results in the error message:
> irq-ls-extirq: Cannot find parent domain
> OF: of_irq_init: Failed to init /soc/syscon@1f70000/interrupt-controller@14
>  ((____ptrval____)), parent 0000000000000000

Probe deferral is only possible having a platform device so the driver is
converted accordingly. It is inspired by commit 8ec99b033147e
("irqchip/sifive-plic: Convert PLIC driver into a platform driver").

Because the interrupt-controller@1f70014 is a child of a syscon node, it is
not probed after platform device conversion. So it has to be moved outside.
This DT change has to be done for all layerscape SoC .dtsi
This is an incompatible change and I don't really know how to address that for
now. I've done it for LS1088A as a proof-of-concept for now.

Comments if this is the way to go or a different approach is more suitable
are very much welcome.

Best regards,
Alexander

Alexander Stein (3):
  irqchip/ls-extirq: Convert to platform driver
  irqchip/ls-extirq: Use managed resources
  arm64: dts: ls1088a: Move extirq outside of syscon

 .../arm64/boot/dts/freescale/fsl-ls1088a.dtsi | 42 +++++------
 drivers/irqchip/irq-ls-extirq.c               | 75 +++++++++----------
 2 files changed, 56 insertions(+), 61 deletions(-)

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2.43.0