gpio-button-hotplug skips buttons with button->irq set because it cannot
handle true interrupt-only gpio-keys descriptions. That check also skips
valid GPIO-backed buttons that provide a separate interrupt specifier, such
as the Meraki MX60 reset button.
Try to acquire the GPIO descriptor before deciding that an explicit-IRQ
button is unsupported. Continue to skip true interrupt-only buttons, and
make the IRQ setup and teardown paths ignore skipped entries.
Tested on: Cisco Meraki MX60. Reset button now works.
Fixes: 23845fa10b ("gpio-button-hotplug: do not error on interrupt attached keys")
Assisted-by: Codex:GPT-5.5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23382
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
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