[PATCH 1/2] irqchip: irq-meson-gpio: make it possible to build as a module
Marc Zyngier
maz at kernel.org
Wed Aug 4 01:50:08 PDT 2021
On Wed, 04 Aug 2021 02:36:45 +0100,
Saravana Kannan <saravanak at google.com> wrote:
Hi Saravana,
Thanks for looking into this.
[...]
> > Saravana, could you please have a look from a fw_devlink perspective?
>
> Sigh... I spent several hours looking at this and wrote up an analysis
> and then realized I might be looking at the wrong DT files.
>
> Marc, can you point me to the board file in upstream that corresponds
> to the platform in which you see this issue? I'm not asking for [1],
> but the actual final .dts (not .dtsi) file that corresponds to the
> platform/board/system.
The platform I can reproduce this on is described in
arch/arm64/boot/dts/amlogic/meson-sm1-khadas-vim3l.dts. It is an
intricate maze of inclusion, node merge and other DT subtleties. I
suggest you look at the decompiled version to get a view of the
result.
> Based on your error messages, it's failing for mdio at 0 which
> corresponds to ext_mdio. But none of the board dts files in upstream
> have a compatible property for "ext_mdio". Which means fw_devlink
> _should_ propagate the gpio_intc IRQ dependency all the way up to
> eth_phy.
>
> Also, in the failing case, can you run:
> ls -ld supplier:*
>
> in the /sys/devices/....<something>/ folder that corresponds to the
> "eth_phy: mdio-multiplexer at 4c000" DT node and tell me what it shows?
Here you go:
root at tiger-roach:~# find /sys/devices/ -name 'supplier*'|grep -i mdio | xargs ls -ld
lrwxrwxrwx 1 root root 0 Aug 4 09:47 /sys/devices/platform/soc/ff600000.bus/ff64c000.mdio-multiplexer/supplier:platform:ff63c000.system-controller:clock-controller -> ../../../../virtual/devlink/platform:ff63c000.system-controller:clock-controller--platform:ff64c000.mdio-multiplexer
lrwxrwxrwx 1 root root 0 Aug 4 09:47 /sys/devices/virtual/devlink/platform:ff63c000.system-controller:clock-controller--platform:ff64c000.mdio-multiplexer/supplier -> ../../../platform/soc/ff600000.bus/ff63c000.bus/ff63c000.system-controller/ff63c000.system-controller:clock-controller
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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