On Wed, Feb 14, 2024 at 5:24 PM Théo Lebrun [off-list ref] wrote:

Support a single IRQs used by multiple GPIO banks. Change the IRQ
handler type from a chained handler (as used by gpiolib
for ->parent_handler) to a threaded IRQ.

Use a fake raw spinlock to ensure generic_handle_irq() is called in a
no-irq context. See Documentation/driver-api/gpio/driver.rst, "CHAINED
CASCADED GPIO IRQCHIPS" for additional information.

Any reason for not using preempt_disable()?

Bart

[snip]