pinctrl: renesas: rzt2h: Setup IRQ in .irq_{request,release}_resources()

When exporting a GPIO using the deprecated sysfs GPIO API,
gpio_is_visible() calls gpiod_to_irq() to determine whether a GPIO is
IRQ-capable, which ends up using
struct gpio_irq_chip::child_to_parent_hwirq().

When using the GPIO character device, it is possible to request a line
and to dynamically switch between using it as an IRQ or as a GPIO, by
updating the edge detector.

The current struct gpio_irq_chip::child_to_parent_hwirq() implementation
makes the assumption that it will only be called with the intention of
setting up the IRQ permanently, and that it will only be released when
the IRQ domain is freed.

Since we now know that this is not the case, take the following steps in
order to properly handle that case.

Implement struct irq_chip::irq_{request,release}_resources() based on
the default GPIOCHIP_IRQ_RESOURCE_HELPERS implementations.

Move the IRQ setup and release logic inside them.

Keep the mapping logic inside ::child_to_parent_hwirq() to be able to
provide a proper HW IRQ number, but do not actually setup the IRQ.

Remove rzt2h_gpio_irq_domain_free() as its only purpose was to free the
acquired IRQs. irq_domain_free_irqs_common() will still be set up as
struct gpio_irq_chip::child_irq_domain_ops::free by
gpiochip_hierarchy_setup_domain_ops().

Cc: stable@kernel.org
Fixes: 829dde3369a9 ("pinctrl: renesas: rzt2h: Add GPIO IRQ chip to handle interrupts")
Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260913195654.3371385-3-cosmin-gabriel.tanislav.xa@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

0 files changed, 0 insertions, 0 deletions